pggeodb.nancy.inra.fr/db_robot - db_robot on pggeodb.nancy.inra.fr

Function: st_neighborhood

Schema

public

Owner

albenard

Descriptions

args: rast, bandnum, pt, distanceX, distanceY, exclude_nodata_value=true - Returns a 2-D double precision array of the non-NODATA values around a given bands pixel specified by either a columnX and rowY or a geometric point expressed in the same spatial reference coordinate system as the raster.

Options

Definition

CREATE OR REPLACE FUNCTION public.st_neighborhood (
 rast public.raster,
 band integer,
 pt public.geometry,
 distancex integer,
 distancey integer,
 exclude_nodata_value boolean = true
)
RETURNS double precision [] AS
$span$
DECLARE
wx double precision;
wy double precision;
rtn double precision[][];
BEGIN
IF (st_geometrytype($3) != 'ST_Point') THEN
RAISE EXCEPTION 'Attempting to get the neighbor of a pixel with a non-point geometry';
END IF;

IF ST_SRID(rast) != ST_SRID(pt) THEN
RAISE EXCEPTION 'Raster and geometry do not have the same SRID';
END IF;

wx := st_x($3);
wy := st_y($3);

SELECT public._ST_neighborhood(
$1, $2,
st_worldtorastercoordx(rast, wx, wy),
st_worldtorastercoordy(rast, wx, wy),
$4, $5,
$6
) INTO rtn;
RETURN rtn;
END;
$span$
LANGUAGE 'plpgsql'
IMMUTABLE
RETURNS NULL ON NULL INPUT
SECURITY INVOKER
COST 100;

COMMENT ON FUNCTION public.st_neighborhood(rast public.raster, band integer, pt public.geometry, distancex integer, distancey integer, exclude_nodata_value boolean)
IS 'args: rast, bandnum, pt, distanceX, distanceY, exclude_nodata_value=true - Returns a 2-D double precision array of the non-NODATA values around a given bands pixel specified by either a columnX and rowY or a geometric point expressed in the same spatial reference coordinate system as the raster.';

This file was generated with SQL Manager for PostgreSQL (www.pgsqlmanager.com) at 26/02/2014 11:51