[talk-ch] Reliefs layers for openstreetmap.ch
yvecai at gmail.com
Sat Dec 29 14:08:08 CET 2012
I downloaded SRTM v3 via the usual ftp, then, patiently, ASTER from
http://reverb.echo.nasa.gov/reverb/ (that's doable).
SRTM void are filled from Aster data with a homemade python script, then
the filled void are smoothen with a 3x3 average filter.
1x1° tiles of hillshade, slopes are computed with gdaldem, then composed
A bif tiff in latlon is merged with gdal, then reprojected to 3857.
Finally, a modified version of gdal2tile computred tiles from zoom 11
and store them in an sqlite.
I'll took the time to put the scripts on github one day.
Note: Sadly, the Matterhorn is wrong in Aster.
On 12/29/2012 01:22 PM, Stefan Keller wrote:
> Salut Yves
> Nice job!
> I hope the maintainer of www.openstreetmap.ch will read this post.
> Just to be curious: How did you process the hillshades and from which
> URL did you download the original data?
> Yours, Stefan
> 2012/12/29 yvecai <yvecai at gmail.com>:
>> I hereby offer www.openstreetmap.ch to use on its web map the contour lines
>> (isohypses) and hillshading overlay layers available at
>> The attribution must quote the following: "ASTER GDEM is a product of METI
>> and NASA".
>> Yves, webmaster pistes-nordiques.org
>> talk-ch mailing list
>> talk-ch at openstreetmap.ch
> talk-ch mailing list
> talk-ch at openstreetmap.ch
More information about the talk-ch