7 replies to this topic

[David Medeiros]

I periodically make maps for an expedition magazine that utilize SRTM elevation data for their relief. These are usually regional maps using not more than 4-6 SRTM tiles from CGIAR (90m resolution). I recently did a map for them that encompassed all of N. & S. America, way too much area for the high-resolution SRTM tiles. Can any one point me to a similar repository of less detailed DEM data that could be used at the continental scale?

Thanks,

Dave

[Ninomax]

Try this http://www.shadedrel...opo2/index.html

[frax]

CleanTopo2 is 2 minutes... then there is GTOPO30 and GLOBE at 30 arc seconds, and ETOPO5 at 5 minutes. CleanTopo2 is probably the "cleanest" of those - with the smallest amounts of artefacts, since it has been edited for map display.

[David Medeiros]

Great, thanks guys! The cleanTOPO2 data is exactly what I need, but I'm having an issue importing it into Natural Scene Designer. The only import option that seems to work is "import grayscale dem". When I do that I get data that looks like the sample below, not like what Tom is showing on his website. It looks like the vertical exaggeration factor is set way too high when in facts it's at 1.0. It also looks compressed in some way. If I open it as a regular tif file the image looks like a normal dem at full resolution. I'll probably contact Tom or NSD but if you have any ideas as to whats going on here let me know.

Attached Files

•  Screen_shot_2009_11_26_at_8.15.06_AM.png   516.71K   50 downloads

[Hans van der Maarel]

David,

I think I once made an Arc Ascii grid out of it. I'm on the road right now, but I could check for you when I'm back home on the weekend.

[David Medeiros]

David,

I think I once made an Arc Ascii grid out of it. I'm on the road right now, but I could check for you when I'm back home on the weekend.

Thats would be great, thanks Hans!

[s hubbard]

Dave,
your maps are super nice. i really like the Steens Mtn one on your site. i'm working with arcscene now trying to replicate that look...
i would love to pick your brain one day
great maps, i'm so jealous

[s hubbard]

hey also dave,
have you considered just using some streaming relief for your background? there's better stuff out there now. i know it's quick and dirty, but can be enhanced (sometimes).