[gdal-dev] gdal contour as transparent png/tif or svg/eps/pdf

[Even Rouault]

Le samedi 21 juin 2014 18:10:38, Robert Grah a écrit :
> Hey there,
> 
> im trying to get a contour out of an GeoTiff file as transparent PNG or
> TIFF or even better as PDF/SVG or EPS file in my C++ program. I found
> gdal_contour but was not able to get PDF driver running.
> How can I install more drivers to GDAL?
> 
> So my approach so far is like following:
> 
> gdal_contour -i 50 mygeotiff.tif contour
> gdal_rasterize -burn 0 -l contour contour mygeotiff.tif
> 
> But with this I am not able to get a transparent contour.
> Is there a different approach beside the command line utils to get contours
> in vectorformat or transparent png/tif out of the geoTiff? It would be
> also great to add some anti-aliasing ;)...

Robert,

I'm able to generate a transparent PDF with a command line like :

gdal_contour -i 50 in.tif out.pdf -f pdf

You presumably need at least GDAL 1.10.

Even

> 
> Cheers,
> Rob
> 
> 
> 
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