Here is an interesting utility based on GDAL and CImg libraries:
http://www.imagico.de/contour_interpolate/
Does this colorate a DEM file ?
I wrote recently a similar tool if folks are interested.
It colorates a DEM after a predefined legend.csv file,
hower it just colorate over several pre-defined segment
values of legend, linear interpolation or color gradient
still not works (some code but too early), but i share the
source code with some examples with pleasure:
http://openrisc.rdsor.ro/segment-dem/segment-dem.tar.bz2
The good part is that its 100% relyed on gdal, i tryed much
to follow coding style too, so i didnt use cimg e.g., there are
some experimental linear color interpolation in HSV space
instead of RGB but it still require more-tweaking
(i study now some algorithm for it, how GIMP apply colorize/gradient)
outupt is not good for human eyes still for the interpolation option,
non interpolation works well however (see CLi switches).
I used it for some generated gdal_grid datas in conjunction with
gdal's VRT driver stuff, to 'colorize' the obtained DEM for
some pollution datas, the produced datas are very nice
and at last satisfy me to not use proprietary vendor tool at all
and be able to done the job with some magic scripting:
http://openrisc.rdsor.ro/segment-dem/out.TIF
If someone see fantasy we can still work on the interpolation
issue, plus i might suggest insted of statical legend.cvs file
an inteligent internal legend-generator option too wich its
pretty possible at last ArcGIS spatial analyst do it well
with many options including the mentioned
auto-legend-classification one. Subject cen be extended
and well thinked, I consider a complete lack of such a good
free tool for now.
//cristian
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