Take the 2-minute tour ×  I've received a GeoTIFF DEM that was
exported from Civil3D and at every contour there is a distinct
terrace created when I process an aspect or slope in QGIS with
the GRASS plugins.   I've looked around a bit and I think this
is related to the algorithm used to create the DEM on the
Civil3D side (Inverse Distance Weighting method). Are there
parameters within Civil3D to prevent this? or Is there a way to
process the terraces out after the file is created in QGIS?
share|improve this question add comment  1 Answer  Such problems
can be overcome with point sampling and reinterpolation. See for
example here:
http://grasswiki.osgeo.org/wiki/Contour_lines_to_DEM
share|improve this answer Sorry, I hadn't logged in for a while,
thanks for the input though. I ended up using r.neighbor and
that seemed to work well. I'll study up on the reference above.
Thanks! –  Erin Apr 4 '13 at 23:07 add comment  Your Answer