Remote sensing of ecosystem services: A systematic review

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Ecological Indicators 52 (2015) 430–443 Contents lists available at ScienceDirect Ecological Indicators journal homepage: www.elsevier.com/locate/ecolind Review Remote sensing of ecosystem services: A systematic review Caio C. de Araujo Barbosa a,, Peter M. Atkinson a , John A. Dearing b a Global Environmental Change and Earth Observation Research Group, Geography and Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom b Palaeoecological Laboratory, Geography and Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom article info Article history: Received 2 July 2014 Received in revised form 4 January 2015 Accepted 5 January 2015 Keywords: Remote sensing Ecosystem services Systematic review Biophysical proxies Earth observation abstract Appropriate integration of remote sensing technologies into ecosystem services concepts and practices leads to potential practical benefits for the protection of biodiversity and the promotion of sustainable use of Earth’s natural assets. The last decade has seen the rapid development of research efforts on the topic of ecosystem services, which has led to a significant increase in the number of scientific publications. This systematic review aims to identify, evaluate and synthesise the evidence provided in published peer reviewed studies framing their work in the context of spatially explicit remote sensing assessment and valuation of ecosystem services. Initially, a search through indexed scientific databases found 5920 papers making direct and/or indirect reference to the topic of “ecosystem services” between the years of 1960 and 2013. Among these papers, 211 make direct reference to the use of remote sensing. During the search we aimed at selecting papers that were peer-reviewed publications available through indexed bibliographic databases. For this reason, our literature search did not include books, grey literature, extended abstracts and presentations. We quantitatively present the growth of remote sensing applications in ecosystem services’ research, reviewing the literature to produce a summary of the state of available and feasible remote sensing variables used in the assessment and valuation of ecosystem services. The results provide valuable information on how remotely sensed Earth observation data are used currently to produce spatially-explicit assessments and valuation of ecosystem services. Using examples from the literature we produce a concise summary of what has been done, what can be done and what can be improved upon in the future to integrate remote sensing into ecosystem services research. The reason for doing so is to motivate discussion about methodological challenges, solutions and to encourage an uptake of remote sensing technology and data where it has potential practical applications. © 2015 Elsevier Ltd. All rights reserved. Contents 1. Introduction ......................................................................................................................................... 431 2. Methodology ........................................................................................................................................ 431 2.1. Search and selection strategy ............................................................................................................... 431 3. Results ............................................................................................................................................... 432 3.1. Systematic review: what has been done.................................................................................................... 432 3.1.1. Numbers and spatial distribution of research ..................................................................................... 433 3.1.2. Remote sensing proxy data used in ecosystem services research ................................................................ 434 4. Potential of remote sensing: what can be done .................................................................................................... 436 5. Discussion: suggestions for improvements ......................................................................................................... 438 5.1. Correcting data .............................................................................................................................. 438 5.2. Land cover ................................................................................................................................... 438 5.3. Vegetation ................................................................................................................................... 439 Corresponding author. Tel.: +44 023 80592258. E-mail addresses: [email protected],[email protected] (C.C. de Araujo Barbosa). http://dx.doi.org/10.1016/j.ecolind.2015.01.007 1470-160X/© 2015 Elsevier Ltd. All rights reserved.

Transcript of Remote sensing of ecosystem services: A systematic review

Page 1: Remote sensing of ecosystem services: A systematic review

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Ecological Indicators 52 (2015) 430–443

Contents lists available at ScienceDirect

Ecological Indicators

journa l homepage: www.e lsev ier .com/ locate /eco l ind

eview

emote sensing of ecosystem services: A systematic review

aio C. de Araujo Barbosaa,∗, Peter M. Atkinsona, John A. Dearingb

Global Environmental Change and Earth Observation Research Group, Geography and Environment, University of Southampton, Southampton SO17 1BJ,nited KingdomPalaeoecological Laboratory, Geography and Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom

r t i c l e i n f o

rticle history:eceived 2 July 2014eceived in revised form 4 January 2015ccepted 5 January 2015

eywords:emote sensingcosystem servicesystematic reviewiophysical proxiesarth observation

a b s t r a c t

Appropriate integration of remote sensing technologies into ecosystem services concepts and practicesleads to potential practical benefits for the protection of biodiversity and the promotion of sustainable useof Earth’s natural assets. The last decade has seen the rapid development of research efforts on the topicof ecosystem services, which has led to a significant increase in the number of scientific publications.This systematic review aims to identify, evaluate and synthesise the evidence provided in published peerreviewed studies framing their work in the context of spatially explicit remote sensing assessment andvaluation of ecosystem services. Initially, a search through indexed scientific databases found 5920 papersmaking direct and/or indirect reference to the topic of “ecosystem services” between the years of 1960 and2013. Among these papers, 211 make direct reference to the use of remote sensing. During the search weaimed at selecting papers that were peer-reviewed publications available through indexed bibliographicdatabases. For this reason, our literature search did not include books, grey literature, extended abstractsand presentations. We quantitatively present the growth of remote sensing applications in ecosystemservices’ research, reviewing the literature to produce a summary of the state of available and feasibleremote sensing variables used in the assessment and valuation of ecosystem services. The results providevaluable information on how remotely sensed Earth observation data are used currently to produce

spatially-explicit assessments and valuation of ecosystem services. Using examples from the literaturewe produce a concise summary of what has been done, what can be done and what can be improvedupon in the future to integrate remote sensing into ecosystem services research. The reason for doingso is to motivate discussion about methodological challenges, solutions and to encourage an uptake ofremote sensing technology and data where it has potential practical applications.

© 2015 Elsevier Ltd. All rights reserved.

ontents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4312. Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 431

2.1. Search and selection strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4313. Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432

3.1. Systematic review: what has been done. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4323.1.1. Numbers and spatial distribution of research . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4333.1.2. Remote sensing proxy data used in ecosystem services research . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434

4. Potential of remote sensing: what can be done . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4365. Discussion: suggestions for improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438

5.1. Correcting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.2. Land cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.3. Vegetation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

∗ Corresponding author. Tel.: +44 023 80592258.E-mail addresses: [email protected],[email protected] (C

ttp://dx.doi.org/10.1016/j.ecolind.2015.01.007470-160X/© 2015 Elsevier Ltd. All rights reserved.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439

.C. de Araujo Barbosa).

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5.4. Spatial scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4395.5. Temporal extent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4395.6. Cultural ecosystem services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439

6. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440

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References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. Introduction

The last decade has seen the rapid development of research onhe topic of ecosystem services and, increasing awareness of theconomic value of ecosystem goods and services among decision-akers and the general public (Morgan et al., 2008; Fisher et al.,

009; de Groot et al., 2010; Fish, 2011; de Groot et al., 2012; Maest al., 2012; Bagstad et al., 2013). Following the release of theillennium Ecosystem Assessment in 2005, a significant increase

n the number of scientific publications on the subject has beenbserved (Egoh et al., 2007; Skourtos et al., 2010; White et al., 2010;ostanza and Kubiszewski, 2012).

Preliminary work has made considerable advances in highlight-ng the links between social and environmental change influencinghe capacity of ecosystems to maintain provisioning, regulating,upporting and cultural services (Costanza et al., 1997; Imhoff et al.,004; de Groot, 2006; Reid et al., 2006; Deegan et al., 2012; Porras,012). Since then, spatially-explicit approaches have been usedidely to map a multitude of ecosystems services, merging theory

nd practice to advance more effective sustainability and conser-ation actions (Sutton and Costanza, 2002; Costanza et al., 2008;ienast et al., 2009; Liu et al., 2010; Murray et al., 2012; Alcaraz-egura et al., 2013; Xie and Ng, 2013; Alamgir et al., 2014).

Remote sensing plays an important role in the study of complexnvironmental interactions between natural and social systems,nd has been used widely to quantify and map ecosystem prop-rties and functions and infer ecosystem processes through aombination of existing instruments and data (Chopra et al., 2001;stin et al., 2004; Chambers et al., 2007; Muraoka and Koizumi,009; Palacios-Orueta et al., 2012). A key advantage of remoteensing is the capability to perform synoptic, spatially continuousnd frequent observations resulting in large data volumes and mul-iple datasets at varying spatial and temporal resolutions (Estreguilnd Lambin, 1996; Stolle et al., 2004; Knaeps et al., 2010; Baraldind Boschetti, 2012; Atzberger and Rembold, 2013; Lewis et al.,013). With the emergence of new and more sophisticated prod-cts, Earth observation data will continue to contribute extensivelyo research on modelling, mapping and valuation of ecosystemoods and services (Nemani et al., 2009; Verburg et al., 2009;arghany and Hashim, 2010; Zinnert et al., 2011; Cabello et al.,

012).There have been numerous efforts to classify the services pro-

ided by ecosystems (Costanza et al., 1997; Daily, 1997; de Groott al., 2002; MA, 2005), and more recent efforts on understand-ng the various contexts in which the ecosystem services conceptas been used have the potential to move a step closer to thestablishment of a meaningful and clear classification system.evertheless, there has not yet been agreement on a single classifi-ation scheme that provides a meaningful and consistent definitionor ecosystem services, with different countries adopting differentlassification schemes, making assessment and valuation studiesependent on realities that are in many occasions site specific.Faber, 2006; Boyd and Banzhaf, 2007; Wallace, 2007; Schmitt et al.,

013).

Remote sensing measures reflected radiation, and by makingse of such measurements and a forward model of the interactionf light with the Earth’s surface, it is possible to inversely estimate

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440

properties of the Earth’s surface such as land cover type, biomass,and leaf area index for each image pixel. Such properties repre-sent spatially varying states at particular points in time. However,other properties of interest (e.g., land use; the function of the land)can only be inversely and indirectly inferred and mapped throughcontextual relations across space.

Some ecosystem services, like primary production have a moredirect relation with the reflected signal (e.g. satellite-derivedchlorophyll measurements), while others, like climate regulationare only indirectly related to the reflected signal (e.g. satellite-derived land surface temperature). Many economically importantservices, such as production of raw materials and food provisioncannot be valued and assessed sufficiently by remote sensing aloneand it may, therefore, be necessary to couple spectral informationwith other available datasets (Fig. 1).

This paper provides a systematic review of the scientific litera-ture related to the use of remotely sensed data within the explicitcontext of ecosystem services valuation assessment. We presentexamples from the literature that summarise (i) what has beendone so far using remote sensing, (ii) what can be done in thefuture, and (iii) what can be further improved. For this purposethe selected literature was reviewed systematically, searching forspecific information regarding the remote sensing platform used,remote sensing product used (e.g. land cover, biophysical indices,etc.) temporal coverage, and other relevant more technical aspectsof remote sensing.

2. Methodology

2.1. Search and selection strategy

This review focused on papers that used ecosystem services con-cepts, and made use of Earth observation data to estimate valueflows of past and current availability of provisioning, regulating,habitat/supporting and cultural services.

The approach taken to querying the literature consisted of aselective keyword search in specific scientific libraries (such as Sco-pus and Web of Knowledge). At each query, terms and keywordssuch as ‘Ecosystem Services’, ‘Ecological Services’, ‘EnvironmentalService’ ‘Remote Sensing’ and ‘Earth Observation were used indi-vidually to produce an extensive list of articles. Using Scopus andWeb of Knowledge the body of literature was searched based on afixed set of inclusion criteria:

(i) The literature should address ecosystem services as eithermain or secondary subject.

(ii) The predefined keywords should exist as a whole in at leastone of the fields: title, keywords or abstract.

iii) The paper should be published in a scientific peer-reviewedjournal.

(iv) The paper should be written in the English language.

Fig. 2 represents the literature search and selection process.

The initial steps of the search process in Fig. 2 returned 5920

published articles on the topic of ecosystem services alone. Thesearch was subsequently refined by querying through the first set ofresults. Searching for predefined keywords and terms related to the

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data i

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Fig. 1. The transform of remotely sensed

opic of remote sensing, the total number of entries was reduced to11 scientific publications. During the data extraction process, theelected publications were scanned to identify and extract informa-ion in the form of descriptive text and identify labels for automatedorting using a custom bibliographic matrix. During our literatureearch we aimed at finding studies meeting the criteria of a peer-eviewed publication, and it should be available through indexedibliographic databases. For this reason, our literature search didot include books, grey literature, extended abstracts and presen-ations.

Throughout the exercise, ecosystem services found withinhe publications were categorised according to the classificationcheme proposed by the Millennium Ecosystem Assessment (MA,005). The MA classification scheme has intrinsic challenges, when

t comes to examining conditions and changes in ecosystems beingeferenced to more than one boundary definition. While thereave been numerous attempts to create a definitive classificationcheme for ecosystem services, there has not been yet an agreement

Fig. 2. Simplified literature search

nto ecosystem services values and flows.

upon which scheme offers a more meaningful and consistent defi-nition (de Groot et al., 2002; Boyd and Banzhaf, 2007; Fisher et al.,2009). The option for the MA classification scheme comes from thisbeing a widely recognised classification scheme that provided acomprehensive assessment of the state of the global environment(MA, 2005).

3. Results

3.1. Systematic review: what has been done.

Total ecosystem services value depends not only on the nat-ural phenomenon and location, but also on context and moresubjective values related to societal wellbeing and cultural percep-

tions. In this context, current mapping methods based on remotesensing data are not sufficient alone for quantifying the full rangeof ecosystem services. At the same time, integration of ecosystemservices valuation methods and remote sensing observation seems

and selection flow process.

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o be the only practical and realistic approaches to regionalise ournderstanding of complex interdependent socio-ecological sys-ems. Where estimation is possible, translation from remoteensing data into estimates of certain ecosystem services values andows may require data other than the spectral information itself.herefore, if remotely sensed data are to be used to predict multiplecosystem services it is required first to identify the nature of theelationship between the spectral information and the ecosystemervice.

Integration of remote sensing data in the explicit context ofcosystem services assessment has enabled numerous studies onow different social and ecological systems are interacting overime. For example, using land-use/land-cover classifications fromime-series of Landsat images many studies were able to mea-ure deforestation rates and, thus, estimate changes in provisioningf raw materials and genetic materials, for example, in China,rgentina and the United Sates (Wang et al., 2006; Volante et al.,012; Klepeis et al., 2013).

Similarly, remote sensing data classified into land cover classes,ombined with biophysical variables such as vegetation indicesVIs), are often used to quantify and map food production (e.g.egraus et al., 2012; Johnson et al., 2012; Castella et al., 2013).n this context, vegetation indices are used as a proxy for croprowth during the growing season, and then coupled with landover and rainfall estimates to predict crop yield and enableorecasts of food production (e.g. Fuller, 1998; Konarska et al.,002; Gong et al., 2010; Ivits et al., 2012; Palacios-Orueta et al.,012).

Muukkonen and Heiskanen (2005), in their study, usedeflectance data from the Advanced Spaceborne Thermal Emissionnd Reflection Radiometer (ASTER) together with a standwise for-st inventory to estimate the biomass of boreal forest stands, usingon-linear regression analysis and neural networks. Merging of VIsnd land cover data may also be useful in creating models for pre-iction of the spatial distribution of species and biodiversity tostimate the availability of genetic materials (Dalezios et al., 2001;oriondo et al., 2007; Saatchi et al., 2007; Nemani et al., 2009;

arman et al., 2010).Using land cover classifications produced by applying a support

ector machine classification to time-series of Landsat imagery,randt et al. (2012) investigated how changes in forest type, lossf old-growth forest and ecotourism development were affectinghe availability of provisioning services (raw and genetic mate-ial), habitat services (biological refugia) and regulating servicespollination and biological control). They found that changes in

anagement practices and politics had a great influence in increas-ng and decreasing logging rates of high-diversity old-growth forestn the biodiversity hotspot of northwest Yunnan Province in south-

est China.Krishnaswamy et al. (2009) investigated the relationship

etween the spectral distances and tree species diversity usingquantile–quantile plot method as an alternative to regression-

ased approaches. Spectral distances were used in modelling forestype variability assuming that the larger the spectral distance thereater the species diversity within sites. A scale-dependent rela-ionship was found between spectral and the floristic distancesetween areas. This approach can be applied to quantify and mapultiple ecosystems services related to habitat, biodiversity, water

nd carbon storage.Combination of landscape metrics and time-series of land

over classifications from the Landsat Thematic Mapper (TM)nd the Moderate Resolution Imaging Spectroradiometer (MODIS)

atched with the proxy biomes from Costanza et al. (1997), has

nabled numerous studies (e.g. Sutton and Costanza, 2002; Zhaot al., 2004; Chen et al., 2007; Zhang et al., 2007; Niu et al., 2012),ith ecosystem service values (ESV) being associated to land cover

l Indicators 52 (2015) 430–443 433

classes assuming a linear relationship between land cover and mar-ket prices per unit area.

Other studies, aiming at quantifying and mapping the spatio-temporal variation in ecosystem services values, based theirmethodology on time-series of land cover data from satellite sen-sor imagery coupled with landscape fragmentation and urbansprawl analysis (Kreuter et al., 2001; Su et al., 2012; Estoque andMurayama, 2013), econometric calculations (Niu et al., 2012), his-torical data (Cai et al., 2013) and meta-analysis of socio-economicvariables (Camacho-Valdez et al., 2013).

Integration of suspended particulate matter concentration andaerosol optical thickness data (from MODIS-Aqua and MODIS-Terra), land cover (from Landsat and MODIS-Terra), nutrient cycling(from SeaWifs) and NDVI (From Landsat and MODIS-Terra) hasbeen used to measure spatial and seasonal patterns of water pro-vision and flood regulation services (Muthuwatta et al., 2010;Ghobadi et al., 2012), erosion regulation, climate regulation andmaintenance of habitat services (Chopra et al., 2001; Gong et al.,2010; Ke et al., 2011) in India, China, Uganda, Iran, Mexico and theUnited States.

Furthermore, Nedkov and Burkhard (2012) have used waterretention functions (of the vegetation and soil cover), digital ele-vation models and land use information to assess the capacities ofdifferent ecosystems to regulate floods. The resulting maps repre-sent estimates of regional supply-demand balances converted intothe ecosystems’ flood regulating service capacity for the Malki Iskarriver basin in northern Bulgaria.

Multi-date imagery from the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS), MODIS and Landsat sensors has beendemonstrated to be effective in measuring and monitoring waterpurification, erosion regulation and natural hazard regulationservices though estimates on the cumulative effects of shiftsin size and spatial configuration of coastal habitats, vegetationcover, surface temperatures, coastal water salinity, chlorophyll,biomass and total suspended matter of marine ecosystems(Doron et al., 2011; Cloern and Jassby, 2012; Paerl and Paul,2012).

3.1.1. Numbers and spatial distribution of researchAfter the literature search, we found that the number of pub-

lished research papers referring directly to the field of ecosystemservices grew from 115 in 2005 to 5920 in 2013, denoting the rapiddevelopment of research within the field. The exponential growthof scientific publications in the field of ecosystem services researchwas followed similarly by an exponential increase in the number ofpublished papers integrating Earth observation data in ecosystemservices research (Fig. 3).

The number of published research papers referring directly toecosystem services and remote sensing has also increased signifi-cantly. The percentage increase in remote sensing and ecosystemservices integrated studies relative to the total scientific productionin the field of ecosystem services is presented in Fig. 4.

To identify biophysical and socio-economic drivers of changein ecosystem service supply and demand, as well as long- andshort-term trends, it is essential that the temporal coverage be ofsufficient length and resolution. In particular, to monitor effectivelythe effects of time-sensitive socio-ecological interactions, it is nec-essary to use a remote sensing platform with a sufficiently frequentrevisit period. Nevertheless, this is not an easy task since the avail-ability of remote sensing data for long-term monitoring purposesis constrained by sensor characteristics (e.g. revisit time) and envi-

ronmental factors (e.g. cloud cover). From Fig. 5 it is clear that thegreat majority of published material has focused on a small tempo-ral extent. Several articles analysed more than 20 years temporalextent, but the number still falls short of what is required to perform
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Fig. 3. Number of papers published annually between 2001 and 2013. This plot represents only those research articles which integrate Earth observation data into the explicitcontext of ecosystem services research.

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ig. 4. Percentage of publications integrating remote sensing and ecosystem servihe fitted regression line clearly indicates a positive trend.

ntegrated analyses, aiming at continuous long-term monitoring ofhanges in ecosystem services supply and demand.

The ecosystem services (and respective categories of servicess defined by the Millennium Ecosystem Assessment (MA, 2005))dentified within the selected literature are presented in Fig. 6 inuch a way that it is possible to visualise which services had areater presence in research integrating Earth observation data intocosystem services research.

From the map in Fig. 7 it is evident that considerable gaps ineographical focus still exist around the world especially, rather

urprisingly, in the African continent. Other areas lacking studiesntegrating remote sensing into ecosystem services assessment andaluation exist in Eastern Europe, Central America and the Middleast.

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Fig. 5. Temporal extent of studies identi

lative to the total scientific production in the field of ecosystem services annually.

3.1.2. Remote sensing proxy data used in ecosystem servicesresearch

Figs. 8–11 show how published works have used remotelysensed biophysical properties to map and quantify provisioning(Fig. 8), regulating (Fig. 9), habitat/supporting (Fig. 10) and cul-tural (Fig. 11) ecosystem services. The figures indicate that thebiophysical properties used generally differ between each categoryof ecosystem service.

For provisioning services (Fig. 8), the categories most well cov-ered are water provision and food provision where seven remote

sensing proxies were used; the least well represented categories aregenetic resources and energy where only two proxies were used,respectively. The dominant ecosystem services proxy variables arerespectively land cover (x̄ ∼= 58%) and NDVI (x̄ ∼= 35%).

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

nt (years)

fied within the literature selected.

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RecreationCultural Heritage

Soil formationPrimary production (Ocean/River)

Primary productionNutrient cycling

HabitatBiological RefugiaWater regulation

Water purification and waste treatmentPollination

Natural hazard regulationGas regulation

Flood regulationErosion Regulation

Disturbance regulationClimate regulation

Biological controlWater Provision

Raw MaterialsGenetic Resources

FoodEnergy

1614121086420Percentage of published papers

CulturalHabitat/SupportRegulationProvision

vision

cwurela

(t

Fig. 6. Percentage of publications using remote sensing to assess pro

For regulating services (Fig. 9), climate regulation, water purifi-ation and waste treatment are the most well covered categorieshere, respectively, eight and five remote sensing proxies weresed. Important services such as biological control, disturbanceegulation and gas regulation are the least well represented cat-gories where only three remote sensing proxies were used. Again,and cover (x̄ ∼= 47%) is appears as the dominant proxy variable used

mong all the categories, followed by NDVI (x̄ ∼= 20%).

For habitat/supporting services (Fig. 10), primary productionfor marine and riverine environments) and biological refugia arehe most well covered categories where seven remote sensing

Fig. 7. Percentage of total published papers per study site integrating sa

ing, regulating, habitat/supporting and cultural ecosystem services.

proxies were used. Soil formation, primary production (land) andnutrient cycling are the least well represented categories with onlythree remote sensing proxies used. Again, land cover (x̄ ∼= 32%)is the dominant proxy variable used among all the categories ofecosystem services, although LAI (x̄ ∼= 13%) and NDVI (x̄ ∼= 7%) bio-physical data have a significant presence.

Estimates of cultural services are often used among stakehold-

ers for planning, conservation, and environmental management.Nevertheless, there seems to be a lack of remote sensing proxydata in use (Fig. 11), with recreation services being covered byonly three proxy variables, and recreation services being covered

tellite remote sensing data within ecosystem services assessment.

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NDVI

Land cover

Sea Surface Temperatures

Land Surface Temperatures

LAI

GPP

Chl-a concentration

Land cover

Sea Surface Temperatures

Land Surface Temperatures

LAI

GPP

Chl-a concentration

Energy Food Genetic Resources

Raw materials Water provision

34%

66%

24%

45%

12%

6%

3%

7%

3%

15%

70%

15%

56%

4%

4%

9%

4%

55%

4%

4%

4%

4%

9%

ected

balimp

NDVI 23% 19%

Fig. 8. Remote sensing variables used within the sel

y only two remote sensing proxies. In the graph, land coverppears as dominant among all ecosystem services categories, fol-

owed by NDVI. In the case of cultural ecosystem services, it isn many ways challenging to produce satellite measurements of

ore subjective values related to societal wellbeing and culturalerceptions.

CDOM indexLAI

Land coverWater Layer

Suspended solidsSea Surface Temp.

NDVILand Surface Temp.

Elevation dataChl-a concentration

CDOM indexLAI

Land coverWater Layer

Suspended solidsSea Surface Temp.

NDVILand Surface Temp.

Elevation dataChl-a concentration

Biological Control Climate Regu

Erosion Regulation Flood Regula

Natural hazard regulation Pollinatio

Water Regulation

17% 33%

50%

2% 3%

36%

2% 2%

42% 11%

2%

60%

10%

20%

10%

33%

17%

17%

33%

40% 20%

20%

20%

33.33% 33.33%

33.33%

52% 16% 16%

16%

Fig. 9. Remote sensing variables used within the selected

literature to assess ecosystem provisioning services.

4. Potential of remote sensing: what can be done

Climate regulating services (e.g. carbon storage and sequestra-tion) can be estimated through quantification of net ecosystemexchange (NEE) of CO2 flux, as NEE can be applied to deter-mine the amount of atmospheric carbon stored in an ecosystem

CDOM indexLAILand coverWater LayerSuspended solidsSea Surface Temp.NDVILand Surface Temp.Elevation dataChl-a concentration

CDOM indexLAILand coverWater LayerSuspended solidsSea Surface Temp.NDVILand Surface Temp.Elevation dataChl-a concentration

lation Disturbance Regulation

tion Gas Regulation

n Water purif. & waste treatment

60%

30% 10%

70%

20% 10%

35% 16%

16% 16% 17%

literature to assess ecosystem regulating services.

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C.C. de Araujo Barbosa et al. / Ecological Indicators 52 (2015) 430–443 437

Thermal infraredLand Surface Temp.GPPBathymetryNDVILAILand coverWater LayerSea Surface Temp.Elevation dataChl-a concentration

Thermal infraredLand Surface Temp.

GPPBathymetry

NDVILAI

Land coverWater Layer

Sea Surface Temp.Elevation data

Chl-a concentration

Biological Refugia Habitat Nutrient Cycling

Primary production (Sea/River) Primary production (Land) Soil formation 8% 8.4% 8.6% 8.8%

16.6% 16.6%

33%

9.2%

9%

9.5%

54%

9%

9.3%

11% 33%

5% 12% 11%

28%

26%

12%12%

26% 12%

12%

34%

34% 16%

16%

15% 57%

14%

14%

ed lite

(Aftfl2

ictitvSe

sgafw(eaaotS

l

Fe

Fig. 10. Remote sensing variables used within the select

Van Tuyl et al., 2005; Soojeong et al., 2006; Potter et al., 2008).dditionally, vegetation indices such as the NDVI, emissivity dif-

erence vegetation index (EDVI) and water band index, as well ashe leaf area index (LAI), can also be used as indicators of net CO2ux (La Puma et al., 2007; Dagg and Lafleur, 2010; Olivas et al.,010; Hao et al., 2012; Kross et al., 2013).

Air quality regulation as the capacity of atmosphere to cleansetself, can be estimated by using trace gases and aerosols as indi-ators, since aerosol data, coupled with simulation models, enablehe source of polluting air to be identified. Additionally, a changen the amount of dust build-up in the air will change the spec-ral reflectance of objects. Thus, pollutants can be detected fromariation in the spectral reflectance (Chu et al., 2003; Emeis andchaefer, 2006; Yong et al., 2010; Roots et al., 2011; Mozumdert al., 2013).

Maintenance of soil fertility can be estimated from remotelyensed indices such as the non-photosynthetic vegetation (NPV),reen vegetation (GV), NDVI and soil spectral mixture analysis, asn increase in NPV is suggested to be related to a decline in soilertility (Numata et al., 2003). Moreover, reflectance data (withinavelengths 0.425–0.695 �m) can be related to soil organic matter

SOM) and used as a proxy for soil fertility (Numata et al., 2003; Jit al., 2012; Liu et al., 2013a). Other mineral features present in soilsnd detectable by remote sensing (e.g. salinity, iron-oxide content,nd heavy metal contamination) change the reflectance propertiesf soils on bare lands and the surrounding vegetation indicating

he past and current status of soils (Taylor et al., 2001; Kemper andommer, 2002; Wu et al., 2005; Melendez-Pastor et al., 2010).

Erosion control regulation can be measured with medium reso-ution optical imagery (e.g. Landsat Thematic Mapper and Landsat

NDVI

Land Surface Temperatures

Land cover

Cultural Heritage Recreation

40%

60%

17%

33%

50%

ig. 11. Remote sensing variables used within the selected literature to assesscosystem cultural services.

rature to assess ecosystem habitat/supporting services.

Enhanced Thematic Mapper) by identifying the reflectance proper-ties of the constituents of sediments (e.g. lithological composition,grain size and moisture content) potentially enabling the detectionof eroded land and material deposition (Small et al., 2009). Veg-etation indices and elevation data are suitable for predicting soilerosion risk, as mapping variability in vegetation cover and plantresidue can help in revealing areas more or less prone to erosion.Remote sensing-based soil erosion models integrate NDVI, vegeta-tion fraction cover, slope gradient and land use (from SRTM data) toestimate annual soil erosion rates (Hochschild et al., 2003; Rahmanet al., 2009; Wu et al., 2011; Wang et al., 2013b).

The diffuse attenuation coefficient (KPAR) for photosynthet-ically active radiation (PAR) can be utilised to assess waterpurification and waste treatment in ecosystems; since the avail-ability of light is fundamental for phytoplankton and sea grassproduction, light attenuation can be used as a measure of turbidityor water clarity (Chen et al., 2009; Liu et al., 2013b). Thus, cor-relating satellite-derived reflectance data with in situ measuredlight attenuation enables assessment of water clarity and, hence,the water purification capacity of ecosystems (Behrenfeld and Boss,2006; Zhu et al., 2009; Zhao et al., 2011).

Earth observation data can be used to quantify the productioncapacity of forests and agro-ecosystems using biomass as an indi-cator. Narrowband and broadband vegetation indices such as NDVI,EVI, fPAR and LAI can be used as indicators of productivity in a cropgrowing season, as they are able to characterise variation in phen-ology and photosynthetic potential of crops and help identify thecropping cycle and growth (Kastens et al., 2005; Muukkonen andHeiskanen, 2005; Brown and de Beurs, 2008; Wall et al., 2008a;Wardlow and Egbert, 2008; Ling et al., 2009; Prabakaran et al.,2013).

The capacity of ecosystems to deliver services such as the pro-vision of energy through solar power can be identified using dailysurface insolation data and atmospheric transmittance, extractedfrom optical and thermal infrared bands, in addition to modelsof aerosol optical depth and columnar ozone (Perez et al., 1994;Roujean, 1998; Morelli et al., 2012; Bhattacharya et al., 2013). Incoastal regions, the capacity to provide wind energy can be esti-

mated from radar imagery such as synthetic aperture radar (SAR),as it provides spatial patterns of wind speed, useful in mappingoffshore wind resources (backscatter coefficients are physicallyrelated to wind speed by observing the roughness of the open sea)
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Johannessen et al., 1999; Hasager et al., 2002; Kozai and Ohsawa,007; Xiulin et al., 2013).

Potential mass flow and rain-induced shallow landslide prob-bility can be predicted using remotely sensed indices, such asegetation indices, the soil brightness index, principal compo-ents transformation and terrain properties (Hyun-Joo et al., 2012;huwen et al., 2012; Yang et al., 2013) and applied in assessingatural hazard regulating services. Furthermore, radar interferom-try (using SAR images) can be applied with image correlationechniques to generate displacement maps (e.g. the Line of Sightirection and the Azimuth direction), resulting in informationhat can be combined routinely to undertake landslide groundurface deformation monitoring by measuring the three dimen-ional surface displacement field at different epochs (Colesantind Wasowski, 2006; Noferini et al., 2007; Righini et al., 2012;aucoules et al., 2013; Tantianuparp et al., 2013).

Remote sensing techniques applied to differentiate the compo-ition of landscape/seascape can enable quantification supportingervices such as nutrient and water cycling (Asner et al., 2004;pillman et al., 2007). Water quality parameters such as dis-olved oxygen, chlorophyll-a and turbidity are closely linked withhanges in absorbance of natural radiation and can be detected byassive remote sensors(Xie et al., 2007; Wang et al., 2013a; Lint al., 2014). Phosphorous concentration levels can also be used torack spatio-temporal water and nutrient cycling patterns acrosseascapes(Aighewi et al., 2013). Other remote sensing variablessed to estimate nutrient cycling are related to measures of forestragmentation and homogeneity, soil moisture and surface temper-tures (Karl, 2002; Chang and Xuan, 2011).

Monitoring and predicting wind storms is of particular impor-ance in assessing the capacity of ecosystems to mitigate theegative effects of storms on coastal areas, croplands and asso-iated infrastructure. Using satellite sensor data it is possible toccomplish this task; for example, using the MODIS reflective andmissive bands and artificial neural networks (Brakenridge et al.,013; El-ossta et al., 2013; Notaro et al., 2013). Moreover, satel-

ite sensor observations of damage caused by storms can also besed to assess an ecosystem’s ability to regulate wind storms, sincehe damage extent on infrastructure and vegetation will most likelyary with the wind speed and strength. Valuable information abouttorm events (e.g. the trends in moderate-duration storms andean sea level) can also be derived from TOPEX/Poseidon and Jason

atellite altimetry data (Sadhuram et al., 2006; Han et al., 2012;haskaran et al., 2013)

Combinations of remote sensing data, stochastic and multi-gent models have clear advantages in modelling and simulatingand cover change, soil erosion, food production, and vegeta-ion dynamics (Evans and Kelley, 2008; Aitkenhead and Aalders,011; Linard et al., 2013). Agent-based and stochastic modellingre potentially suitable approaches for expanding our knowledgebout landscape functioning, climatological variability, biophysi-al constraints, economic and social dynamics. Therefore, these areotentially capable of providing insights into how highly complexystems behave and interact, and how they impact on the avail-bility of ecosystem services (Jepsen et al., 2006; Wada et al., 2007;rown et al., 2008; Evans and Kelley, 2008; Frank et al., 2012).

. Discussion: suggestions for improvements

The use of remote sensing within ecosystem services researchs still limited, and up until 2009 this topic had a relatively small

resence in the literature. Nevertheless, the general trend indi-ates that the number of scientific publications integrating remoteensing into ecosystem services studies is increasing rapidly. Thiss no surprise given the possibilities for integrating spatial data

l Indicators 52 (2015) 430–443

into ecosystem studies and establishing relationships betweenremote sensing data and socio-ecological phenomena. The increas-ing exponential rate of integrated scientific studies is expandingour knowledge and pointing to areas for future development. Inthis section, we consider some of the weaknesses of the reviewedresearch studies and suggest improvements.

5.1. Correcting data

A few points of connection were found relevant within theselected publications. For example, in 85% of the publications therewas no clear indication of whether the effects of the atmosphereon the reflectance values was taken into account prior to the anal-ysis of the remotely sensed data for ecosystem services assessmentand valuation (e.g. land cover classification process). 15% of sci-entific papers claimed to have performed atmospheric correction,although no reference was made to the algorithm applied. Manyindividual studies focused on mapping changes in the delivery ofecosystem services through time. However, to maximise the ben-efits of doing so, change detection should be done automatically inan operational environment, and the resulting information shouldbe sufficiently reliable that it can be related effectively to what isobserved on site (Beresford, 1990; Petit and Lambin, 2001; Songet al., 2001; Coppin et al., 2004; Sesnie et al., 2008; Zeng et al.,2012). This implies an operational atmospheric correction proce-dure to correct for the effects of aerosols, sun glint, thin clouds,cloud shadows and adjacency effects (Lambin, 1996; Cairns et al.,2002; Elmahboub et al., 2006; Vanonckelen et al., 2013).

Where correcting for atmospheric effects is mandatory, even asimple atmospheric correction algorithm such as the dark objectsubtraction can increase the accuracy of land cover classificationand change detection results (Moran et al., 1992; Song et al., 2001).A total of 28% of selected articles used single date imagery to assessecosystem services; in these cases the application of an atmo-spheric correction algorithm may not be as essential as if imageclassification were to be performed for multiple dates (Kawata et al.,1990).

5.2. Land cover

Remote sensing for the assessment and valuation of ecosys-tem services is still highly dependent on land cover data usedas proxies for the actual ecosystem service. Land cover hasbeen used as the main source of remotely sensed data in themajority of articles, serving as proxy data to spatial value transfer-based modelling approaches, which have been demonstrated tobe highly scale-dependent, producing inaccurate estimates whencompared to primary data (Eigenbrod et al., 2010). By assum-ing a ESV = Area * Market price relationship, the valuation exercisewill produce ecosystem services values that rely largely on thearea measurements extracted from the satellite imagery. There-fore, ecosystem services valuation efforts in the context of remotesensing will be highly dependent on spatial resolution and imageclassification accuracy (Cai et al., 2013).

Linking ecosystem functions and benefits to human well-beingrequires the knowledge of where the benefits of ecosystem ser-vices are manifest. Mapping the linkages between areas whereecosystem services are generated and where they are consumed isimportant for management and policy development (Cowling et al.,2008; Reyers et al., 2009; von Haaren and Albert, 2011; Bagstadet al., 2014; Sturck et al., 2014). In this context, through a combi-nation of land cover/land use data, social and economic data the

remote sensing based approach is critical in defining these links,especially when it comes to providing the information we needto define spatially and historically where the ES are produced andwhere these services are consumed by the beneficiaries.
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Understanding the linkages between areas where ecosystemervices are generated and where they are received is important forolicy development, because, decisions by ‘upstream’ stakeholderso meet local requirements, may lead to positive or negative con-equences from the perspective of ‘downstream’ stakeholders, atarger scales. Once receptor areas have been identified, then stake-olders who benefit (‘beneficiaries’) and those who either do noteceive services (‘neutrals’) or who see a decrease in service sup-ly (‘losers’) can be identified (node 3B). This approach facilitates a

needs analysis’ that can in turn inform strategic decision-making,hough this is often complicated because stakeholders may be win-ers within the context of some ecosystem services and losers inelation to others, especially when evaluated over longer time hori-ons. The identification of beneficiaries allows spatially explicitepresentation of ecosystem service values. This in turn allowsdentification of strategies for equitable modifications to ecosystemervice provision (node 3D).

Appropriate measures to address the uncertainty of land coverlassification are a prerequisite to any mapping exercise (Olofssont al., 2013; Rocchini et al., 2013; Sexton et al., 2013). Through eval-ation of the selected literature we identified the assessment ofhematic accuracy of land cover classification to be another impor-ant issue, only 17% of the studies within the selected literatureppeared to have performed accuracy assessment on the land coverlassification results. A variety of measures were used to describehe accuracy of land cover classification. For example, to summarisehe results of an accuracy assessment, authors used the overallroportion of area and/or pixels correctly classified, the Kappa coef-cient of agreement, and the user’s and producer’s accuracies. Thepplicability of land cover data relies on its quality, and in this con-ext it is critical to assure the validity of the classification resultsnd their suitability for any particular purpose. In addition, therror budget included in the classification will most likely propa-ate through the analyses linking the final land cover map to otheratasets used for the ecosystem services valuation at any given spa-ial scale (Congalton and Green, 1993; Gahegan and Ehlers, 2000;e Clercq et al., 2009).

.3. Vegetation

Vegetation indices derived from satellite sensor images haveecome a major data source for monitoring ecosystem services,uch as climate regulation, primary production and natural hazardsegulation that are linked to vegetation condition. Nevertheless,one of the studies reviewed accounted for the influence of sensorharacteristics in the calculation of their NDVI values. For example,DVI values derived from MODIS products were applied in cap-

uring vegetation phenology, although the relatively coarse 500 mpatial resolution and smoothing forced by the 16 day BRDF modelnversion reduces their ability to capture fine scale temporal vari-tion in phenology (Jing et al., 2004; Hadjimitsis et al., 2010).ifficulties may, thus, emerge in detecting inter-annual variation

n phenology, and estimating phenological parameters such as thenset of greenness (OG), length of season and end of senescence,ffecting directly the robustness of relationships involved in esti-ating and forecasting crop cycles and crop yield (Fuller, 1998;

asnyat et al., 2004; Brown and de Beurs, 2008; Drolet et al., 2008;all et al., 2008b; Mkhabela et al., 2011).

.4. Spatial scale

The spatial scale at which ecosystem services are assessed

hrough remote sensing will greatly influence the resulting ecosys-em services monetary values, as changes in area within the landover types will impact the amount of change in total ecosystemervice values (Konarska et al., 2002; Nelson et al., 2009). It is

l Indicators 52 (2015) 430–443 439

important to understand how ecosystem assessments and mon-etary valuations will vary with changes in spatial scale, especiallywith most ecosystem services assessment and valuation studiesbeing supported by multi-sensor land cover data. For example, ifusing data from multiple sensors (assuming that they have differ-ent spatial resolutions), the resulting land cover classes will differin area (Boumans et al., 2002), and consequently affect ecosystemservice valuations. Depending on the spatial resolution, data fromdifferent sensors will most likely produce different estimates forthe same area (Konarska et al., 2002).

Another issue will emerge if the image scene contains subdom-inant and rare classes. These exist largely at the sub-pixel scaleand, thus, are difficult to resolve with thematic coarse resolutionsatellite sensor imagery (Serra et al., 2003; Aguirre-Gutierrez et al.,2012). Furthermore, due to the coarse spatial resolution (both spa-tial and spectral) of some satellite sensors, land cover classes thattend to appear in small patches are often omitted from the final clas-sification product, and consequently replaced by other dominantclasses surrounding them (e.g., using the maximum likelihood clas-sification method). Depending on the classification method used,the chosen classifier might be dominated by the prevalent classand fail to account for the rare examples. As a result, small and rareclasses may be underestimated and the large classes overestimated(Congalton, 1991; Hammond and Verbyla, 1996; Doan and Foody,2007).

5.5. Temporal extent

Observation of patterns in human activities over time, and thecapacities of different ecosystems to provide services under dif-ferent scenarios of land use change is a key element in most socialand ecological studies. In the literature selected 44% of studies haveused Earth observation data corresponding to a temporal extentgreater than ten years, and within this value 20% of studies con-centrate on extending observations to more than twenty years.

Ecosystem services studies would benefit greatly from exten-sive repeat surveys, as they are extremely useful in detecting andanalysing the temporal and spatial dynamics of ecosystem servicesand their likely beneficiaries. For example, if an area is convertedfrom forests to agricultural land this inevitably causes a loss of crit-ical habitat, and any ecosystem services study that considers only ashort period of time will fail to accurately assess the costs and ben-efits of that land use/cover conversion and the differences in thetiming of subsequent impacts. Consequently, research efforts inte-grating Earth observation data into ecosystem services studies willneed to ensure that the temporal extent of the analysis is consis-tent with the temporal extent of the projected impacts, such as instudies focused on long term monitoring of shifts on socioeconomicconditions and climate change.

5.6. Cultural ecosystem services

Earth observation data can be used to help define high priorityareas for tourism and conservation, and link concepts of heritageand identity to the landscape (Turner et al., 2003; Naidoo andRicketts, 2006; Cabello et al., 2012). However, assessment and val-uation of cultural ecosystem services through remote sensing havebeen focused mainly on extracting data to feed into GeographicInformation Systems (GIS) (Bender et al., 2005; Gret-Regamey et al.,2008; Sherrouse et al., 2011). The GIS object based approach is usu-ally not sufficient to reveal the complex behaviour emerging fromthe interactions between social and ecological systems, which in

turn is critical to define and constrain any given cultural ecosystemservice (Brown, 2005). In this context, cultural services and com-munity values tend to be overlooked and not entirely considered(Raymond et al., 2009; Daniel et al., 2012).
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The application of remote sensing combined with economic andocial data (both quantitative and qualitative) may help to stablishhe necessary abstractions we need when accounting for culturalcosystem services. For example, the combination of satellite datae.g. crop productivity, land cover, precipitation, and land sur-ace temperatures) individual and group choices, in a multi-agent

odelling environment, has the potential to provide estimates ofultural ecosystem services. Inevitably, the modelling exercise willroduce valuable data that can be used as input into dynamic sim-lation models, improving our understanding about the nature ofhanges occurred at varying spatial scales through time.

Assessment and valuation of cultural ecosystem servicestrongly depends on perceptions and expectations of users andtakeholders. Medium resolution satellite imagery (e.g. 30 mesolution Landsat images) can be used to inform users andtakeholders, creating more intuitive representations of the envi-onment, influencing expectations and choices, and inevitablyontributing to participatory and deliberative decision making.

In future studies, interdisciplinarity integrating more of RS intostimating cultural ecosystem services may provide the necessaryeans to move beyond measuring the value of physical stocks

bove the Earth’s surface, and start systematically valuing the cul-ural services provided to society.

. Conclusions

This systematic review summarises research progress towardshe use and integration of remote sensing data within the contextf ecosystem services valuation and assessment. Individual exam-les from the literature were reviewed to suggest what has beenchieved so far, what can be done and what can still be improvedhen using remote sensing data to estimate ecosystem services.

Through a systematic review of the literature on remote sensingor ecosystem services assessment and valuation studies, it wasossible to describe quantitatively both the overall numbers ofublications through time, and the relation between the range ofemotely sensed biophysical properties predicted and the ecosys-em services which they are used to estimate. The results showhich ecosystem services are the most measured from space, what

ind of remote sensing data have been applied more frequentlyn estimating these ecosystem services, the temporal resolution ofhese research efforts, and where in the world more research is stilleeded.

Several basic technical issues need to be addressed more fre-uently, as these issues will influence the overall uncertaintyudget, as follows: the accuracies of classification results and bio-hysical data used as proxies, the different spatial, temporal andpectral resolutions of the satellite sensor system (in many caseshis restricts the utilisation of the remotely sensed data) and, whenossible, the need to account for the dominant conditions at theime of image acquisition (e.g., atmospheric interference, viewingeometry, etc.).

Future research needs to account for the fact that effective map-ing of the full range of ecosystem services is currently beyondhe capabilities of remote sensing alone and, therefore, more con-erted research is needed to overcome this and other limitations,or example, through fusion of remotely sensed data with informa-ion from other sources.

cknowledgements

The authors thank the Coordination for the Improvement ofigher Education Personnel (CAPES) Foundation within the Min-

stry of Education in Brazil for the funding and support provided to.C. de Araujo Barbosa. We also would like to extend our gratitude

l Indicators 52 (2015) 430–443

to the reviewers for their helpful comments and suggestions on themanuscript.

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