The BASE-platform project: Deriving the bathymetry from combined satellite data - PowerPoint Presentation

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The BASE-platform project: Deriving the bathymetry from combined satellite data - PPT Presentation

Stefan Wiehle Bernat Martinez Knut Hartmann Martin Verlaan Tim Thornton SuiWin Hui Dick Schaap Bathymetry Measurement of waterdepth Underwater topography ID: 1021340

data base wiehle platform base data platform wiehle chart stefan hydro17 2017dlr sdb bathymetry resolution satellite optical sar water

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1. The BASE-platform project: Deriving the bathymetry from combined satellite data Stefan Wiehle, Bernat Martinez, Knut Hartmann, Martin Verlaan, Tim Thornton, SuiWin Hui, Dick Schaap

2. BathymetryMeasurement of waterdepthUnderwater topographyCharts with isobaths for navigation> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 2RostockScreenshot: webapp.navionics.com

3. BathymetryMeasurement of waterdepthUnderwater topographyCharts with isobaths for navigationBathymetric maps for scientific applications> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 3Screenshot: EMODnet-bathymetry.eu

4. Importance of bathymetrySafety of navigation> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 4Costa Concordia, 13 July 2012 (Source: Camerist, CC BY SA)

5. Importance of bathymetrySafety of navigationOffshore industries> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 5Lillgrund Wind Farm (Source: Mariusz Paździora, CC BY SA)

6. Bathymetry measurementMost water depths: Survey vessels with echo soundersOptically shallow waters: LIDAR on planesGood resolution and accuracyHigh costs> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 6Multi-purpose vessel Noortruck in Rostock-Warnemünde during Hydro16

7. Existing bathymetric dataGEBCO (GEneral Bathymetric Chart of the Oceans)Free to useSurvey data and interpolationAvailable worldwide~900m resolutionEMODnetFree to useSurvey data; GEBCO for gapsLimited to European waters~230m resolution> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 7Screenshot: www.gebco.net/Screenshot: www.emodnet-bathymetry.eu/

8. BASE-platform projectCreate satellite-derived bathymetry (SDB)Offer these data on web portalBathymetry data combiningOptical SDBSAR SDBAltimetry SDBCrowd-sourced bathymetry (CSB)Water level modellingHorizon2020 project (12/2015-11/2017)> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 8

9. Satellite-derived bathymetry (SDB)Different techniquesShallow waters: Optical SDBMedium depths: SAR SDBDeep waters: Altimetry SDB> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 9BenefitsSatellite data free or cheapFast turnover timeHigh data quality using validated methods

10. Optical SDB> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 10Using optical satellite image data of multiple missions (e.g. Sentinel-2)Physics-based inversion methods to determine water depthfrom seafloor reflectance intensities in different wavelengthsDepths: 0 to 30m; spatial resolution: 2m to 15mExample of EOMAP’s Optical SDB productEOMAP’s Optical SDB processing chain

11. SAR SDB> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 11Using SAR data of multiple missions (e.g. Sentinel-1, TerraSAR-X)Using wave shoaling effect (wave length reduces in shallow water)Depths: 10 to 100m; spatial resolution: up to ~100mDLR’s SAR SDB processing chainExample of DLR’s SAR SDB product

12. Altimeter SDBUsing Altimeter satellite data (e.g. Jason-1,Sentinel-3A)Based on changes in gravity affecting sea surface levelcaused by large underwater structures (~10km to 200km)Depths: all non-shallow, spatial resolution: 1 km> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 12Example for isardSAT’s Altimeter SDB productisardSAT’s Altimeter SDB processing chain

13. Crowd-sourced bathymetry (CSB)> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 13Using GPS and depth sounding data collected by ships going about their normal activitiesDepths: up to 2km, spatial resolution: 32mteamSurv’s CSB processing chainExample for teamSurv’s ship tracksand the resulting bathymetry

14. Waterlevel correction> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 14All methods gather depth at time of measurementWaterlevel simulations allow worldwide correctionOutput data in LAT or MSLLowest Astronomical Tide relative to Mean Sea LevelPresentationby Martin Verlaanon Thu, 14:05h

15. Data merging> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 15Combination of the products obtained from each methodSpatial resolution: approx. 15m gridded dataMerged data example and GEBCO data for NW MauritiusPresentationby Sandra Gaytán Aguilartoday, 14:25h

16. Data accuracySDB data compared to CSB and available multibeam surveys ChallengesBathymetry changes over time; data may be deprecatedAvailable multibeam data not free of errors (measurement and localization)Corrections applied to survey data for obvious errors> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 16MethodOpticalSARAltimeterMergeDepth range (m)0-3010-100>1000AllMean error (m)-1,53-7,13-58,83-3,7URMSE (m)1,1811,6788,984,27

17. Trial areas> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 17Data for the trial areas is available for free on our website!

18. BASE-platform data portalProvides easy and fast access to data for end usersOff-the-shelf dataAlready createdDirect downloadGrowing amount of areasOrder dataCreated on requestAll covered areasDelivery time: ~3 weeks> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 18

19. Thanks for your attention!> Hydro17 > Stefan Wiehle • BASE-platform > 14.11.2017DLR.de • Chart 19This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 687323Stefan WiehleDLR Maritime Safety and Security Lab BremenStefan.Wiehle@dlr.de+49 421 24420 1863www.base-platform.com