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Tabulate Area tool making up NoData in output table

Question asked by gmbacon on Jun 16, 2016
Latest reply on Jun 17, 2016 by Dan_Patterson

I'm running a model that tabulates land cover area inside a watershed polygon and the output table shows significant NoData square footage while ignoring one of the true land cover classes in the land cover raster. There are no NoData pixels inside the watershed polygon (see attached). The raster_test table shows the correct result when a raster version of the watershed is input as the zone to Tabulate Area, while the CoverSummary table shows the incorrect tabulation of NoData area when a vector watershed is the zonal input. In this case, the vector watershed tabulation ignores the OTHER_PAVED_SURFACES land cover type. Why does this happen? I realize the workaround would be to use the raster watershed as the zone, but this seems like it should work either way. The error has occurred in ArcMap 10.2.2 and 10.4.

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