The Matterhorn looks good on Geofabrik hillshade using 4.1, so I guess it's better. I'll use it one day, I think. Yves
----- Reply message ----- De : "Stefan Keller" sfkeller@gmail.com Pour : "Openstreetmap Schweiz/Suisse/Svizzera/Svizra" talk-ch@openstreetmap.ch Objet : [talk-ch] Reliefs layers for openstreetmap.ch Date : mer., janv. 2, 2013 02:44
Dear Yves
Thanks for the explanations. Do you know the differences from the SRTM v3 you mentiones to this new version 4.1? http://www.cgiar-csi.org/data/srtm-90m-digital-elevation-database-v4-1
Yours, Stefan
2013/1/1 Etienne Trimaille etienne@trimaille.eu:
Merci pour les explications Yves.
Si jamais tes sources avec un howto sont disponibles, je suis preneur ;-) Je suis en train de me pencher sur mapnik en ce moment, je vais en avoir besoin avec du relief.
2012/12/29 yvecai yvecai@gmail.com
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 with imagemagick. 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.
Yves
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@gmail.com:
I hereby offer www.openstreetmap.ch to use on its web map the contour lines (isohypses) and hillshading overlay layers available at www.pistes-nordiques.org. The attribution must quote the following: "ASTER GDEM is a product of METI and NASA".
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