Hi Gerard! gerard robin wrote: > Well, i thought that costline was calculated with the intersection of the > sea level (or water level) and the ground altitude. > I was wrong, my imagination was (is) out of reality. :)
Actually, it is the other way around, IIRC (Martin, correct me if I'm wrong). The water body boundaries are determined from other sources (e.g. Landsat) and are used to remove the spikes in the SRTM data which are often found in the area of water bodies, as the radar reflectivity of water surfaces differs greatly from that of other surfaces. The SWBD (SRTM Water Body D???) contains the boundaries of the water bodies used for this postprocessing of the data. SRTMv2 and onwards are based on the same raw data as captured by the the single Shuttle Radar Topography Mission. The only difference is additional processing of the data, such as the removal of spikes on water bodies as mentioned above. Cheers, Ralf ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
