Base platform workshop_09_feb17

The BASE-Platform service: Producing bathymetry from combined

satellite and crowd sourced dataS. Wiehle, M. Verlaan, K. Hartmann, S. Lewis, P. Gallés, D.

Schaap and T. Thornton

01/05/2023 BASE-platform 2 / 19

1. What is Bathymetry?2. Available Bathymetry data

3. About the BASE-Platform project

4. BASE-Platform products and services

5. BASE-Platform trial areas

6. Where to find the products?

7. Q&A

Topics

01/05/2023 BASE-platform 3

Don’t hesitate to ask questions during the presentation.Either use the chat channel, or email [email protected]

Please identify yourself and your organisation when asking a question

Questions and Answers

01/05/2023 BASE-platform

• Bathymetry is the study of the depths and shapes of underwater terrain• Hydrography is the measurement of those depths, as well as tides, currents etc.• 71% of the Earth’s surface is covered with water• Over 85% of the world ocean floor remains unsurveyed to modern standards

4

Figure 1. Example of bathymetry map: ETOPO1 Global Relief Model. Source: NOAA

1. What is Bathymetry?

https://www.ngdc.noaa.gov/mgg/global/global.html

01/05/2023 BASE-platform 5 / 19

• Extended areas are not mapped to sufficient accuracy, or existing data is out of date.• Bathymetry is essential for various user groups and for multiple applications.

Figure 3. Some examples of bathymetry applications (construction, coastal risk management, tourism, navigation, fishery, port and harbours, oil and gas, offshore wind farms, submarine cables, dredging industry, research community). Sources: Maritime journal, BBV, Coolantartica,

Nature, Port de Barcelona, Smarttech, sungreenengineering.

1. Bathymetry applications

http://www.maritimejournal.com/news101/industry-news/ships-services-contract-for-maasvlakte-2-dredging

http://bestbeachvacationsin.com/asia/maya-bay-beach-ko-phi-phi-island-thailand/

http://www.coolantarctica.com/Antarctica%20fact%20file/History/ships/Yamal_ice_breaker.php

http://www.nature.org/ourinitiatives/regions/asiaandthepacific/indonesia/explore/

http://www.portdebarcelona.cat/es/web/el-port/espacios-portuarios

http://smarttech.com.br/novo/onde-atuamos/energia-e-infraestrutura/

http://smarttech.com.br/novo/onde-atuamos/energia-e-infraestrutura/

http://www.sungreenengineering.in/windmill-energy-auditing.htm

Figure 4. Ship surveying the seafloor. Source: POA(Phot) Ray Jones/MOD


2. Established hydrographic survey methods

• Most water depths: Survey vessels with echo sounders

• Optically shallow waters: LIDAR on planes

• Good resolution and accuracy

• High cost

https://commons.wikimedia.org/wiki/File:HMS_Scott_At_Anchor_near_Port_Lockroy_in_the_Antarctic_MOD_45152343.jpg

• GEBCO – Free to use– Survey data and interpolation– Available worldwide– ~900m resolution

• EMODnet– Free to use– Survey data and GEBCO for gaps– Limited to European waters– ~230m resolution

• NOAA NGDC – EMODnet for the USA• National Hydrographic Offices

– Survey data or nautical charts – shoal bias– Formats generally geared to navigation– May restrict access and/or charge

• Commercial Providers, e.g. FindMaps!– Acquire data from multiple sources– Provided in GIS friendly formats– Often the best quality, highest resolution and

most up to date source

Figure 5. Screenshot: www.gebco.net/

Figure 6. Screenshot: www.emodnet-bathymetry.eu/


2. Available bathymetry data

http://www.gebco.net/

http://www.gebco.net/

http://www.emodnet-bathymetry.eu/

http://www.emodnet-bathymetry.eu/


• BASE-platform is a 2 year EU supported H2020 project, finishing November 2017

• Offers bathymetry to end users on a web portal• Bathymetric data combining:

- Optical Satellite Derived Bathymetry (SDB)- SAR SDB- Altimetry SDB- Crowd-sourced bathymetry (CSB)- Water level modelling

8

Website: http://www.base-platform.com

Partners:

3. What is the BASE-Platform project?


“Good enough” data for many applications- Better than free sources like EMODnet and GEBCO- Significantly cheaper than commissioning a survey

vessel or Lidar, if not as accurate

9

Website: http://www.base-platform.com

3. What is the BASE-Platform project?

01/05/2023 BASE-platform 10 / 19

Figure 7. Concept of the BASE-platform. Left: Synergy of the different methods to retrieve bathymetric data by combining different EO based methods. Right: Concept of data flows and interaction. Source: BASE-platform.

• Data from different techniques (optical, SAR and altimetric SDB and CSB) are combined, each having complementary characteristics and depth ranges

• All corrected for tides and reduces to a common vertical datum• Data from the EU funding period made available as open data


01/05/2023 BASE-platform 11 / 19

Strengths

Applications

- Fast turnaround – can often use existing imagery- No need to deploy a survey vessel

- Cost and time saving- No risk to vessel or crew in hazardous areas- No bad weather downtime

- Cost effective solution

- Altimetry SDB is the only large area solution for deep waters- Other techniques cover coastal waters- Ideal for remote areas that other methods cannot easily reach- Surveying areas that are not critical for navigation of shipping- Pre-survey tool for multi-beam survey of critical areas

4. What can satellites offer?


Strengths

Applications

- Easy acquisition of data where vessels go- About 10 million seagoing vessels globally, so room to grow!- Low cost solution, not dependent on expensive technology- Continuous resurveying, so easy to detect changes with time- Community engagement and raised awareness of marine

environment

4. And the crowd?

- Depths up to 100m for small craft, 2000m for ships- Surveying areas that are not critical for navigation of shipping- Pre-survey tool for multi-beam survey of critical areas- Monitoring silting and erosion in channels, ports and harbours- Ground truth data for satellite and Lidar based bathymetry

01/05/2023 BASE-platform 13 / 19

- Using Sentinel-2, WorldView-2/3 and Landsat 8 satellite images- Uses the colour shift of light going through the water- Depths 0 - 30m depth- Spatial resolution 2 - 15m, depending on imagery used- Vertical accuracy: 0.5 m ± 10% depth CE90- Time resolution: on demand

Figure 8. Example of EOMAPs satellite derived bathymetry product. Source: BASE-platform.

Optical


01/05/2023 14 / 19

- Using TerraSAR-X and Sentinel-1 satellites- Based on measuring wave length - Depths 10 – 70m- Spatial resolution: ~ 100 m- Vertical accuracy: < 5 m- Time resolution: on demand

Figure 9. Example of SAR bathymetry. Source: DLR.

SAR

BASE-platform



- Using CryoSat-2, Jason-1 and Sentinel-3A satellite images- Based on changes in gravity affecting sea surface level- Depths > 2000m, >10km from land- Spatial resolution: 1km- Vertical accuracy: 100 m- Time resolution: annually

Figure 10. Example of isardSAT satellite derived bathymetry product based on CryoSat-2 and Jason-1 for the Mauritius Islands. Source: isardSAT.

Altimetry

15



- Recruit vessels to log position and depth whenever at sea- Raw tracks uploaded for processing in the cloud- Depths 1 – 100m (small craft), 10 - 2000m (ships)- Spatial resolution: typically 32m- Vertical accuracy 0.2 – 0.8m -> 2.5% of depth with enough data- Time resolution: daily updates

Figure 11. Example of CSB. Source: Smartcom Software

CSB

16


- Apply corrections for tidal elevation to total water depth- Global hydrodynamic model- Spatial resolution: 5km gridded data- Vertical accuracy: 7cm in deep water, 15cm on shelf- Time resolution: 10 minutes

Sealevelmodelling


Figure 13. Computational grid of the hydrodynamic model. Source: BASE-platform.


- Apply corrections for tidal elevation to total water depth- Global hydrodynamic model- Spatial resolution: 5km gridded data- Vertical accuracy: 7cm in deep water, 15cm on shelf- Time resolution: 10 minutes

Sealevelmodelling



01/05/2023 19 / 19

- Bathymetry traditionally relative to Chart Datum / Lowest Astronomical Tide

- Conversion possible to Mean Sea Level, Ellipsoid or Geoid

Verticalreference

BASE-platform

Figure 14. Lowest Astronomical Tide relative to Mean Sea Level. Source: BASE-platform.


- Combination of the products obtained from each method- Spatial resolution: depending on source data- Vertical accuracy: depending on the source data- Time resolution: on demand



Merged bathymetry

Optical




Merged bathymetry

Altimetry




Merged bathymetry

SAR




Merged bathymetry

CSB




Merged bathymetry

Combined

- Making it easy to access bathymetric data- Simple selection of your area of interest- Instant purchase and download of off the shelf data sets- Ordering of data sets produced on demand- Trial area data free until November 2017

Data portal



- Making it easy to access bathymetric data- Simple selection of your area of interest- Instant purchase and download of off the shelf data sets- Ordering of data sets produced on demand- Charging only starts after end of EU project (Nov. 2017)

Data portal




Data portal



• Test areas for the various technologies in the project• Validate results against any existing survey data in the area• Demonstrate capabilities to partners in each area, and to the

wider bathymetric community

• 4 trial areas in 2016• Potentially additional areas in 2017



• Balearic Islands

• Channel Islands

• Mauritius Islands

• Wadden Sea

Figure 13. Screenshot. Grey: only GEBCO data. Source: EMODnet-bathymetry.eu



http://portal.emodnet-bathymetry.eu/


• Channel Islands


• Wadden Sea

Figure 14. Screenshot. Grey: only GEBCO data. Source: EMODnet-bathymetry.eu.



http://portal.emodnet-bathymetry.eu/


• Channel Islands


• Wadden Sea

Figure 15. Optical bathymetry of Mauritius. Source: BASE-platform.




• Channel Islands


• Wadden Sea

Figure 16. Elbe estuary: High tide and low tide. Source: BASE-platform.

TerraSAR-X 20141119T170200 TerraSAR-X 20150821T170203




Figure 17. Screenshot of the data portal. Source: BASE-platform.

www.base-platform.com

6. Where to find the products?

Now• Download data for each trial area

from each data provider• All data provided under CC Open

Data licence

Coming soon…Data access portal• Offers off the shelf data and

possibility to order data• User parameters

- Area- Dataset- Resolution- File format


We want to learn how we can best meet your needs

Please identify yourself and your organisation when asking a question

If you cannot use the chat tool, or have any thoughts afterwards, email [email protected]

For those interested in what we are doing, we would like to follow up with you in detail after the workshop

If you haven’t already done so, please spend a few minutes completing our questionnaire at:http://www.base-platform.com/Data/User-Requirements-Questionnaire

We will be at the events below – please come and see us:- Ocean Business - IHO Assembly- MCA CHAS Seminar - Regional workshops

Questions and Answers

http://www.base-platform.com/Data/User-Requirements-Questionnaire

http://www.base-platform.com/Data/User-Requirements-Questionnaire

Base platform workshop_09_feb17

Science

Transcript of Base platform workshop_09_feb17