Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

To go a little bit further than the semantic question regarding DEM/DTM/DSM, I'd like to know if there is a free (of charges and use) DTM datasets? And what about resolution?

As far as I know,only DSM are available to public for free.

Thanks, simo

share|improve this question
    
Where in the world do you need the information for? –  James S Feb 3 '11 at 11:51
    
There's some sample lidar data here: capcog.org/information-clearinghouse/geospatial-data –  Kirk Kuykendall Feb 3 '11 at 17:43
add comment

3 Answers

For a list of sources, see also here: http://grass.osgeo.org/wiki/Global_datasets

share|improve this answer
add comment

If you are in the UK there is the Ordnance Survey Land-Form PANORAMA dataset that is available as part of OS OpenData. It is available as a DTM or as contours. The DTM is designed for use at a scale of 1:50,000.

For more information, use the link below:

http://www.ordnancesurvey.co.uk/oswebsite/products/landformpanorama/

share|improve this answer
    
Hi James. Thanks for that information. Unfortunately, I live in France and IGN did not yet release its DTM for free - the free release of the BD ALti is minimum 250 m resolution. It takes time, but they are on a good way ... –  simo Feb 3 '11 at 18:08
add comment

Unsure of your location, but you may want to try the USGS if you're in the US. I think resolution is variable based on location, but you may find something of use here:

http://seamless.usgs.gov/

share|improve this answer
    
It looks like the topo maps have been moved, if that is what you are looking for. But a search for them provided me with this link that might be helpful http://www.terrainmap.com/rm39.html –  MaryBeth Feb 3 '11 at 16:48
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.