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rcoup/gist:4991063

Last active December 13, 2015 23:19
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gdal relativeToVRT resolution for symlinks
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gistfile1.md

/path/to/data/foo.vrt:

<VRTDataset rasterXSize="512" rasterYSize="512">
  <GeoTransform>440720.0, 60.0, 0.0, 3751320.0, 0.0, -60.0</GeoTransform>
  <VRTRasterBand dataType="Byte" band="1">
    <ColorInterp>Gray</ColorInterp>
    <SimpleSource>
      <SourceFilename relativeToVRT="1">images/utm.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SrcRect xOff="0" yOff="0" xSize="512" ySize="512"/>
      <DstRect xOff="0" yOff="0" xSize="512" ySize="512"/>
    </SimpleSource>
  </VRTRasterBand>
</VRTDataset>

So utm.tif actually exists at /path/to/data/images/utm.tif

Then symlink the .vrt

$ ls -la /path/to/projects/
lrwxrwxrwx 1 rcoup rcoup   39 Feb 12 12:55 foo.vrt -> /path/to/data/foo.vrt

If you GdalOpen() the /path/to/projects/foo.vrt, GDAL tries to resolve /path/to/projects/images/utm.tif (ie. relative to the symlink source), which fails. Because it's actually at /path/to/data/images/utm.tif (ie. relative to the symlink target).

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