Application of Spaceborne SAR for Rapid Environmental Assessment: Efficient Monitoring and Updating of Coastal Bathymetries
Cees De Valk(1) and Geert J. Wensink(1)
P.O. Box 61,
8325 ZH Vollenhove,
The Bathymetry Assessment System (BAS) constructs
depth maps from radar
images and a limited number of echo soundings
by numerical inversion of a
two-dimensional model for the imaging mechanism.
This paper describes the
current version of BAS.
Some recent results are presented.
With the best
ERS or ENVISAT images, BAS is able to produce high quality
in coastal waters with complex topography up to 30 m depth.
areas like shoals the requirements on the radar image are less restrictive,
especially when additional information from
optical images is used. It will
be shown that in such areas BAS yields bathymetric
maps with a quality that
is comparable to that of traditional maps based
on dense echo soundings.
Another application of the BAS is for updating
outdated charts with
recently acquired satellite data for rapid
environmental assessment. An
example of an updated coastal chart
of different estuaries around the world
will be shown.