2009/4/11 Iván Sánchez Ortega <[email protected]>: > El Sábado, 11 de Abril de 2009, Tim Waters (chippy) escribió: >> I think the way these are done are to use a digital evevation model - >> I would hope the free SRTM could be sufficient? > > On the contrary: AFAIK, SRTM's are done by seeing the differences between > overlapping aerial photos.
SRTM stands for Shuttle Radar Topography Mission, so i don't think they use aerial photos. :-) many of the high-quality DEMs (Digital Elevation Model), such as the soviet ones, are created from stereo photogrammetry. although more modern ones are starting to use LIDAR. cheers, matt _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
