ST_Mean4ma
Prev 9.11.2. Built-in Map Algebra Callback Functions Next

Name

ST_Mean4ma — Raster processing function that calculates the mean pixel value in a neighborhood.

Synopsis

float8 ST_Mean4ma(float8[][] matrix, text nodatamode, text[] VARIADIC args);

double precision ST_Mean4ma(double precision[][][] value, integer[][] pos, text[] VARIADIC userargs);

Description

Calculate the mean pixel value in a neighborhood of pixels.

For Variant 2, a substitution value for NODATA pixels can be specified by passing that value to userargs.

[Note]

Variant 1 is a specialized callback function for use as a callback parameter to ST_MapAlgebraFctNgb.

[Note]

Variant 2 is a specialized callback function for use as a callback parameter to ST_MapAlgebra.

[Warning]

Use of Variant 1 is discouraged since ST_MapAlgebraFctNgb has been deprecated as of 2.1.0.

Availability: 2.0.0

Enhanced: 2.1.0 Addition of Variant 2

Examples: Variant 1

SELECT 
    rid,
    st_value(
        st_mapalgebrafctngb(rast, 1, '32BF', 1, 1, 'st_mean4ma(float[][],text,text[])'::regprocedure, 'ignore', NULL), 2, 2
    ) 
FROM dummy_rast 
WHERE rid = 2;
 rid |     st_value
-----+------------------
   2 | 253.222229003906
(1 row)

Examples: Variant 2

SELECT 
    rid,
    st_value(
              ST_MapAlgebra(rast, 1, 'st_mean4ma(double precision[][][], integer[][], text[])'::regprocedure,'32BF', 'FIRST', NULL, 1, 1)
       ,  2, 2)
  FROM dummy_rast 
   WHERE rid = 2;
 rid |     st_value
-----+------------------
   2 | 253.222229003906
(1 row)

See Also

ST_MapAlgebraFctNgb, ST_MapAlgebra, ST_Min4ma, ST_Max4ma, ST_Sum4ma, ST_Range4ma, ST_StdDev4ma

Prev Up Next
ST_Max4ma Home ST_Min4ma