The grid approach: Practical implementation, advantages Title … · The grid approach: Practical...
Transcript of The grid approach: Practical implementation, advantages Title … · The grid approach: Practical...
Title
First name SURNAMEPosition
Place, date
Name of the entity
The grid approach: Practical implementation, advantages and disadvantages and comparison
with CLC
Geir-Harald STRANDDirector, Land resource surveys
Copenhagen, 19-20 Oct 2014
NIBIO, Norway
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 2
«The universe» - here represented by a topographic map
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 3
Survey approach: Delineation and classification of land units
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 4
The grid approach: A regular geometry of grid cells
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 5
The grid: Units are characterized - not classifed
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 6
Urban Open built-up Agriculture Forest Open land Mire Water
The grid: A data rich model populated with data from many sources
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Net changes – Gross changes
7
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 8
+
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 9
GEOSTAT 1AGEOSTAT 1BGEOSTAT 2
http://www.efgs.info/
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Appropriate grid cell size?
10
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Resolution – 1 km compared to CLC
11
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Resolution
12
EEA (2010) reporting 5 424 171 km2 as the total area covered
220 000 grid cells with a 5 x 5 km grid model 5 500 000 grid cells with a 1 x 1 km grid model
500 000 000 grid cells with a 100 x 100 m grid model
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Advantages
13
• Unbiased statistics• Suitable for modelling and analysis• Integrate data from various sources• Improved access to restricted datasets• INSPIRE compatible• Tools available (production, analysis and visualization)• Improved cooperation with other sectors (e.g. NSAs)
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen 14
Disadvantages
• Unfamiliar geometry• Backward compatibility with pre-grid CLC• Variable quality and specification of input data
Challenges
• Handling mixed and scale-dependent CLC classes• Representing change
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Net changes – Gross changes
15
Time 0 Time 1
Forest
ForestClear-cut
Clear-cut
Net change: Nil (Still 50 % forest and 50 % clear cut)Gross change: 100 % (land cover has changed everywhere)
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Forest change – case study from Finland
1 2 and 1 3Same net changes (more built-up; less forest)Different gross changes
16
Forest reduction
Forest increase
paceNew Horizons for European and Global land monitoring - Copernicus products and services ready to use, 19-20/10/2015, Copenhagen
Mixed and scale dependent classesCLC 243 – Land principally occupied by agriculture
17