Name
ST_MinDist4ma — Raster processing function that returns the minimum distance (in number of pixels) between the pixel of interest and a neighboring pixel with value.
Synopsis
double precision ST_MinDist4ma(double precision[][][] value, integer[][] pos, text[] VARIADIC userargs);
Description
Return the shortest distance (in number of pixels) between the pixel of interest and the closest pixel with value in the neighborhood.
![[Note]](images/note.png) | |
The intent of this function is to provide an informative data point that helps infer the usefulness of the pixel of interest's interpolated value from ST_InvDistWeight4ma. This function is particularly useful when the neighborhood is sparsely populated. |
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This function is a specialized callback function for use as a callback parameter to ST_MapAlgebra (callback function version). |
Availability: 2.1.0