Use global DEM instead of or in addition to SRTM

[dittaeva]

SRTM is limited to area between 60 deg. north and 58 deg. south. What about:

1. ASTER v2: Covers almost the whole world with high 30 metres resolution, but there are still some issues with anomalies and voids. Used successfully by turkompisen.no. Limits on distribution of original data, no limits on use and distribution on derived data that cannot be converted back to original data.
2. GMTED2010: Only one with worldwide coverage, good accuracy and quality, but best resolution is 7.5 arc-seconds (~232 m). Should be public domain. Suitable for routes of several km, but not good for (at least) sub-1 km routes.

[grundid]

Thanks for pointing this out. I didn't know the other sources besides SRTM.

How would you like to proceed? Would you like to contribute some patches?

[dittaeva]

I'd love to, but that is beyond my abilities and time at the moment. If you have questions about how turkompisen.no has used the ASTER data you could ask espen at espenpost dot com, with the right format (similar to SRTM) I suppose it wouldn't take that much effort?

[grundid]

If the format is the same as with SRTM then you're right. I would have to check how to get the data first.

As for now I'll leave this issue open.

[dittaeva]

Looks like they aren't the same, but these links could be helpful in converting to SRTM format:

• http://arsf-dan.nerc.ac.uk/trac/wiki/Processing/SRTMDEMs
• http://www.ictworks.org/obtaining-and-converting-aster-gdem-data-srtm-radio-mobile