Available with Geostatistical Analyst license.
By default, Geostatistical Analyst interpolates the values of the selected variable at all locations that lie within the minimum spatial bounding box. The minimum spatial bounding box is the smallest box that can be created to encompass all the input sample points. However, this bounding box may not produce a map that fully covers the area of interest. To create an output map that exceeds the bounding box is called extrapolation. The resulting geostatistical layer from an extrapolation will cover the area that you have indicated.
It is not recommended that you extrapolate values for distant locations. It is acceptable to extrapolate values close to actual sample points (for example, around the boundary of a geostatistical layer), but any further extrapolation may result in unreliable predictions.
- Right-click the geostatistical layer in the ArcMap table of contents for which you want to extrapolate values and click Properties.
- Click the Extent tab.
- Click a custom extent entered below in the Set the extent to list.
- Type the new values in the visible extent.
Alternatively, use the extent of any other available layer.
- Click OK.