By Isaache - 1/11/2015 8:05:46 PM
Hi,
For what I can see France Digital Terrain Model resolution is good enough to be viewed at 1:100.000 scale and be close to 1 sample per pixel on the other hand Spain DTM roughly is 20 times less dense, there is an official source (Instituto Geografico Nacional / National Geographic Institute) available at 200, 25 and 5 meters per pixel for the whole Spanish territory.
Is there any chance you could use that source (it is free for personal use but I believe it is paid for commercial use) to improve the actual SD?
http://www.ign.es/ign/layoutIn/modeloDigitalTerreno.do
Thanks
Isaac
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By guille - 1/27/2015 5:32:42 PM
I agree completely with Tim. Last year I made a flight of several days in Spain and discussing with Spanish pilots, they confirmed that the rule can have a relatively "soft" interpretation. An error of 200 or even 300 ft can be acceptable. The height values given by SD are, in my opinion, enough, no need of a perfect accuracy. Of course this is not official information.
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