[OSM-talk] People's Map

[Matt Amos]

2009/4/11 Iván Sánchez Ortega <ivan at sanchezortega.es>:
> 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