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ST_AsRasterAgg

ST_AsRasterAgg
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Name

ST_AsRasterAgg — Aggregate. Renders PostGIS geometries into a new raster.

Synopsis

raster ST_AsRasterAgg ( geometry geom , double precision val , raster ref , text pixeltype , double precision nodataval , text uniontype , boolean touched ) ;

Description

Returns a single-band raster containing the rendered version of all incoming geometries, each with its associated value.

Availability: 3.6.0

Examples 

WITH inp(g,v) AS (
	VALUES
		( ST_Buffer(ST_MakePoint(10,0), 10), 1 ),
		( ST_Buffer(ST_MakePoint(20,0), 10), 2 )
),
agg AS (
	SELECT ST_AsRasterAgg(
		g,
		v,
		ST_MakeEmptyRaster(0,0,0,0,1.0),
		'8BUI',
		99,
		'SUM',
		true
	) r
	FROM inp
)
SELECT
	ST_Width(r) w,
	ST_Height(r) h,
	ST_Value(r,'POINT(5 0)') v5_0,
	ST_Value(r,'POINT(15 0)') v15_0,
	ST_Value(r,'POINT(25 0)') v25_0
FROM agg;
 w  | h  | v5_0 | v15_0 | v25_0
----+----+------+-------+-------
 30 | 20 |    1 |     3 |     2
(1 row)