[OSM-talk] People's Map

[Iván Sánchez Ortega]

El Sábado, 11 de Abril de 2009, Tim Waters (chippy) escribió:
> What happens is that the distance from lens to ground is different
> over varying terrain, so it doesn't match what a map would be.

These will help:

http://en.wikipedia.org/wiki/File:OrthoPerspective.svg
http://en.wikipedia.org/wiki/File:AerialDigitalPhoto.JPG
http://en.wikipedia.org/wiki/Orthophoto

> 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.

-- 
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Iván Sánchez Ortega <ivan at sanchezortega.es>

MSN:i_eat_s_p_a_m_for_breakfast at hotmail.com
Jabber:ivansanchez at jabber.org ; ivansanchez at kdetalk.net
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