ST_MinDist4ma
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)
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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