[GRASS-user] OT: converting color graphic to height data possible?

WolfgangZ wollez at gmx.net
Sun Aug 26 08:41:33 EDT 2007


I found a layer on a web map server that shows elevation data (no shaded 
relief as I think). Is it possible to convert the color information that 
is in the image back to elevations? Here a link to one image:

I suppose r.mapcalc would be the tool to use, but it seems not possible 
without the right color map. Any suggestions?

Kind regards

PS: I'm sorry for being a bit off topic, as this is not mainly grass 

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