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I need to add a value to a dem file along a polyline feature or within a polygon. How can I add 100 to the values of the raster cells intersected by my line feature or within my polygon feature.

I would like to know how to do this in QGIS, if possible.

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Using GDAL:

  1. Create a mask from the resulting vector stuff (polyline feature or within a polygon) http://www.gdal.org/gdal_rasterize.html
  2. Synchronize the map area, the raster width of the mask with the config of the dem http://www.gdal.org/gdal_translate.html
  3. Use gdal_calc.py with the mask condition to add 100 to your dem. http://www.gdal.org/gdal_calc.html

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