I would like to clip a DEM with an admin boundary using qgis, in order to calculate a measure of variation. However, when I use the Raster clipper tools and select mask, I get the error message: "An error has occured while executing Python code: ...".
It seems this has been noticed by others: see http://osgeo-org.1803224.n2.nabble.com/Re-qgis2google-and-clipper-plugins-td6604408.html
Does this imply that the tool is unavailable for use with Wroclaw 1.7.3?
All I am looking for is a measure of variation based on an admin boundary, and was planning to use the ruggedness index.
Is there a fix for the clipper tool I am unaware of, or any other simple way to calculate a measure of topological variation? It doesn't have to be ruggedness.