Jan Hartmann wrote:
Frank, is there a description of the way the smoothing is done, or
should I look it up in the code?
Jan,
It does a user defined number of iterations of 3x3 average filtering,
only altering the interpolated pixels. The algorithm discussion,
such as it is, is attached to the API function:
http://gdal.org/gdal__alg_8h.html#0a079afef61968f224b159d48423d1c6
BTW: there is a description of the algorithm used in GRASS to create
contour lines:
https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.contour/README
This looks much more adapted to the specific case of contour lines than
the general weighted distance model in GDAL (which is the best one for
general purposes IMHO). Would it make sense/be possible to adapt the
GRASS code for GDAL? Doesn't look all too difficult to me.
st regards,
My reading of r.contour is that it creates contours from a raster, the
process equivelent to what gdal_contour does, not gdal_rasterize +
gdal_fillnodata.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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