[gdal-dev] Overlay shapefile onto Geotiff image

[Rutger]

Graeme B. Bell wrote
> You'll need to tell it what size you want to burn. You can do that by
> looking at the extents (northeast, southwest) of your current
> raster/geotiff.

If you make a copy of the Geotiff you already have, you can provide it as
the 'destination dataset' for gdal_rasterize, it would then (of course)
automatically pick up all the output properties for you. You can then for
example first burn with value 1, and then to another pass with burn value 0
and set the '-i' flag to invert the rasterization, that way anything not
touching the lines will be set to 0, which you can later use as a nodata
value to get the transparency. 

Note that the destination dataset for gdal_rasterize gets modified 'in
place', so especially when experimenting make sure you always have a
copy/backup.



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