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NCO as of 4.9.0-beta01 can test maps for conservation and consistency. See: Assess and Address Regridding Weights in Map-Files with ncks.
In addition, maps can be checked for accuracy. TempestRemap can automatically generate some standard test functions which can then be remapped and we can compute the mapping error, and check if it is at the expected level. In practice, all 1st order conservative maps give the same l2 and max error if they pass the conservation and consistency checks. For higher order maps, these errors can be used to compare different algorithms.
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