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This is the command gdalcompare that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



gdalcompare - gdalcompare.py compare two images


gdalcompare.py [-sds] golden_file new_file


The gdalcompare.py script compares two GDAL supported datasets and reports the
differences. In addition to reporting differences to the standard out the script will also
return the difference count in it's exit value.

Image pixels, and various metadata are checked. There is also a byte by byte comparison
done which will count as one difference. So if it is only important that the GDAL visible
data is identical a difference count of 1 (the binary difference) should be considered

If this flag is passed the script will compare all subdatasets that are part of the
dataset, otherwise subdatasets are ignored.

The file that is considered correct, referred to as the golden file.

The file being compared to the golden file, referred to as the new file.

Note that the gdalcompare.py script can also be called as a library from python code
though it is not typically in the python path for including. The primary entry point is
gdalcompare.compare() which takes a golden gdal.Dataset and a new gdal.Dataset as
arguments and returns a difference count (excluding the binary comparison). The
gdalcompare.compare_sds() entry point can be used to compare subdatasets.


Frank Warmerdam [email protected]

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