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

I often wonder how the authorities expect ultralights to know their exact height above the ground so they can ensure it's less than 1000ft.

They obviously expect ultra lights to be equipped with radar altimeters! Ha Ha!

Mike
_________________________________________