Problem: Output of Contour and Kriging functions has the extent of the input and not of the mask


A mask is set in the General tab of the Options dialog box of Spatial Analyst. The Contour or Kriging function is run on a dataset that has a larger extent than the mask. The output dataset has the same extent as the input, not of the mask, as was intended.


This is a known issue with ArcGIS 8.1.
The Contour and Kriging functions of Spatial Analyst do not respect the Mask set in ArcGIS 8.1.

Solution or Workaround

  • For the Kriging operation:

    1. Run a “relation equal to” operation in the Raster Calculator with the output from the Kriging function.

    2. Enter the output raster layer into the Raster Calculator:


    This will yield a final raster with the same extent as the mask.

  • For the Contour operation:

    1. Clip the data to be contoured by using a “relation equal to” operation in the Raster Calculator.

    2. Type the layer to be clipped to the mask in the Raster Calculator:


    3. Use the resulting raster in the Contour function. The final result will be a dataset with the same extent as the mask.