Comments on: Free 10-Meter UTM SDTS 24K DEMs

By: Leszek Pawlowicz

Leszek Pawlowicz — Sun, 29 Jul 2007 04:08:42 +0000

There’s 90-meter SRTM data available for a good part of the world, but for higher resolution, you either have to buy it or digitize it yourself from a topo map.

By: Simon Jackson

Simon Jackson — Fri, 27 Jul 2007 12:57:43 +0000

Does anyone know of any DTM data for the UK?

By: Leszek Pawlowicz

Leszek Pawlowicz — Tue, 24 Jul 2007 17:34:11 +0000

I've posted on some of these before, particularly the USGS Seamless Server. But the NED data can sometimes have odd artifacts, due either to re-sampling to geographic coordinates or matching up borders. SDTS can be a painful format, but the quality is very high. And the ADTI website offers SDTS DEMs at high download speeds.

By: gisuser

gisuser — Tue, 24 Jul 2007 17:23:53 +0000

FYI,
the 3 USGS partners are the only official USGS distributors of the DEMS – a totally hideous decision by the USGS! FYI, but, these data are easily and freely available for free download via many county, State and other GIS clearinghouses. The following detailed resources lists a number of free DEM resources:
- free USGS data – http://www.gisuser.com/content/view/607/28/
- A GISuser Primer on the National Elevation Data Product (NED) – http://www.gisuser.com/content/view/1396/28/
- FGDC Suggested State Clearinghouse Websites – http://www.gisuser.com/content/view/4588/28/
- State GIS Clearinghouse Directory – Update, July 2004 – http://www.gisuser.com/content/view/2379/28/

these articles offer up a ton of suggested resources where you can grad DEMs in DEM format rather than the painful sDTS and the data are free and available via FTP or speeds much faster than 10 or even 5 KBPS (as offered by commercial usgs partners) how painful would that be!