[mkgmap-dev] [PATCH v4] contours

Mon Jul 13 13:29:35 BST 2009

  >     - write a little utility to paste GeoTIFF files together
  >
  > gdal tools should be able to do this. 

  Yes, the GDAL tools are able to do this, I have to do it this way for
  elevation lines for mapnik rendering.

I wrote code to do this to render USGS DRGs, and while the code is not
polished, I did release it.  The library libdrg has a procedure to
return a row of data, and will choose the right scale (among 1:25K
1:100K 1:250K DRGs) and then grab pixels from adjoining maps as
appropriate.  You'd have to create input files (easy if the tiffs are
already set up nicely - there's a lot of hair for grabbing square
lat/lon blocks out of UTM-referenced tiffs).  So this may not be all
that useful.

Bits are at http://www.lexort.com/software/
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