Working with Tabulate Area

If you encounter a problem with Tabulate Area, there are certain issues that typically are the root cause. Some of these issues are listed in the following sections, as well as some suggestions on how to work around them.

"One or more inputs have no associated attribute table" error

This error is often the result of the zone input not having the required attribute table.

"Unable to allocate memory" error

The program uses internal tables to perform the area calculations. If the values of the zone input have a very large range (millions), the memory requirements to process these tables can approach or exceed the specified system paging file size.

If the amount of memory configured is insufficient, the operation will fail with the "Unable to allocate memory" message. There are two general solutions to this problem:

Output areas are smaller than expected

Some of the area values in the output table may be smaller than what you may have expected.

This is typically related to NoData cells in the input with a higher resolution becoming a larger area of NoData after it is resampled to match the other, coarser input.

To avoid this situation, use either Resample on the coarser input raster to make it match the resolution of the finer input raster, or set the Cell size raster analysis environment to Minimum of Inputs.

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