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I have been using QGIS for about 4 months now and its been great to learn a new package.

I have been trying to open a source raster (*.adf) files in QGIS. I can display the raster set itself, however, the appropriate attribute data fails to join the spatial dataset. Can QGIS display the full source raster for ArcGIS? Or is the a 'proprietary' format that can only be fully displaying in Arc?

Thanks for any help.

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1 Answer 1

Qgis uses to access .adf rasters, Arcinfo Binary Grids (note: .adf files are also used for Arcinfo vectors). Reading the reverse engineered Arc/Info Binary Grid Format description page one sees

vat.adf: This relates to the value attribute table. This is the table corresponding integer raster values with a set of attributes. I presume it is really just a pointer into info in a manner similar to the pat.adf file in a vector coverage, but I haven't investigated yet.

So, no Qgis probably can't read Arcinfo raster attributes. That document was written a long time ago though, so perhaps things have changed.

I don't have access to a vat-enabled raster right now so can't test, but I surmise the structure outlined in the Raster dataset attribute tables Arcgis help is likely quite similar to the vat.adf structure, for those wishing to plug the hole in the format description and perhaps extend the gdal aigrid format driver.

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