The DNSC08BAT Bathymetry developed from satellite altimetry

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Presentation transcript:

The DNSC08BAT Bathymetry developed from satellite altimetry g Ole B. Andersen and P. Knudsen (DTU-SPACE)

DNSC08 Bathymetry DNSC08 Bathymetry In Google Earth EGU meeting, Vienna, Austria | April 2008 | OA | page 2

The DNSC08 Bathymetry High Quality MSS/Gravity field can be used to map bathymetry. The GEBCO-1 minute is co-registred with DNSC08 used to derive bathymetry Using Spectral sepration throught filtering (20 and 120 km) Adjusting wavelength 20 km – 120 km based on DNSC08 gravity optimizing coherency (outside these bands GEBCO-1 is used) Adjusting depth where GEBCO-1 > 100 meters. Principle of using Gravity to predict Bathymetry (From Sandwell/Smith) EGU meeting, Vienna, Austria | April 2008 | OA | page 3

GEBCO-1 Global Bathymetry EGU meeting, Vienna, Austria | April 2008 | OA | page 4

Difference with GEBCO-1 Global Bathymetry EGU meeting, Vienna, Austria | April 2008 | OA | page 5

Comparison with Polar Stern Bathymetry Survey example around Antarctica 11.981 obs Std Dev. (meters) Max difference ETOPO 5 (5 minute) 531 3014 ETOPO 2 (2 minute) (Altimetry enhanced) 243 1642 GEBCO – 1 minute 201 1792 DNSC08 – 1 minute 132 1188 EGU meeting, Vienna, Austria | April 2008 | OA | page 6

Summary DNSC08 Bathymetry Resolution: 1 minute by 1 minute (2 km by 2 km) True global fields (90°S to 90°N) DNSC08BAT ftp.spacecenter.dk/pub/BATHYMETRY DNSC08 All files ftp.spacecenter.dk/pub/DNSC08 DVD: Contact oa@space.dtu.dk Consistent Products available: Altimetric (geometrical) MSS DNSC08-MSS Altimetric derived Bathymetry DNSC08-BAT Altimetryc derived MDT DNSC08-MDT Altimetric Marine Gravity field DNSC08-GRA Products also available in Google Earth EGU meeting, Vienna, Austria | April 2008 | OA | page 7