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Comment from Sanderd17 on 9 September 2014 at 11:26

You can get free elevation data from NASA, and there are tools to convert it to be used with OSM data and be rendered (note that elevation data should never be uploaded here).

Check http://wiki.openstreetmap.org/wiki/Srtm as a start.

The tools mostly mention rendering the elevation contours. But if you treat the contours as areas instead, you can fill them with the colour you want.

Also note that this isn’t done very often for worldwide, zoomable maps. If you pick a linear scale, most things will be low compared to the mount everest, So even mountain will appear in a green-ish tint.

Comment from SK53 on 9 September 2014 at 12:04

OpenCycleMap has hypsometric tinting. I don’t know how it’s done on a large scale, but I suspect using one of the gdal tools. This blog post by MapBox contains more info.

Comment from Tom Chance on 10 September 2014 at 09:10

Maperitive can do this without needing too many technical skills.

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