Inverse Distance Weighting (IDW) in GS⁺

Inverse Distance Weighting (IDW) and Normal Distance Weighting (NDW) are interpolation techniques in which interpolated estimates are made based on values at nearby locations weighted only by distance from the interpolation location. Neither IDW nor NDW make assumptions about spatial relationships except the basic assumption that nearby points ought to be more closely related than distant points to the value at the interpolate location. IDW applies stronger weights to nearby points than does NDW.  Other interpolation techniques in GS⁺ include kriging and conditional simulation.

The IDW tab is part of the larger Interpolation Window.