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|
DROP TABLE IF EXISTS raster_mapalgebra;
CREATE TABLE raster_mapalgebra (
rid integer,
rast raster
);
DROP TABLE IF EXISTS raster_mapalgebra_out;
CREATE TABLE raster_mapalgebra_out (
rid1 integer,
rid2 integer,
extent varchar,
rast raster
);
CREATE OR REPLACE FUNCTION make_test_raster(
rid integer,
width integer DEFAULT 2,
height integer DEFAULT 2,
ul_x double precision DEFAULT 0,
ul_y double precision DEFAULT 0,
skew_x double precision DEFAULT 0,
skew_y double precision DEFAULT 0,
initvalue double precision DEFAULT 1,
nodataval double precision DEFAULT 0
)
RETURNS void
AS $$
DECLARE
x int;
y int;
rast raster;
BEGIN
rast := ST_MakeEmptyRaster(width, height, ul_x, ul_y, 1, 1, skew_x, skew_y, 0);
rast := ST_AddBand(rast, 1, '8BUI', initvalue, nodataval);
INSERT INTO raster_mapalgebra VALUES (rid, rast);
RETURN;
END;
$$ LANGUAGE 'plpgsql';
-- no skew
SELECT make_test_raster(0, 4, 4, -2, -2);
SELECT make_test_raster(1, 2, 2, 0, 0, 0, 0, 2);
SELECT make_test_raster(2, 2, 2, 1, -1, 0, 0, 3);
SELECT make_test_raster(3, 2, 2, 1, 1, 0, 0, 4);
SELECT make_test_raster(4, 2, 2, 2, 2, 0, 0, 5);
-- skew
SELECT make_test_raster(10, 4, 4, -2, -2, 1, -1);
SELECT make_test_raster(11, 2, 2, 0, 0, 1, -1, 2);
SELECT make_test_raster(12, 2, 2, 1, -1, 1, -1, 3);
SELECT make_test_raster(13, 2, 2, 1, 1, 1, -1, 4);
SELECT make_test_raster(14, 2, 2, 2, 2, 1, -1, 5);
DROP FUNCTION IF EXISTS make_test_raster(integer, integer, integer, double precision, double precision, double precision, double precision, double precision, double precision);
CREATE OR REPLACE FUNCTION raster_mapalgebra_intersection(
rast1 double precision,
rast2 double precision,
xy int[],
VARIADIC userargs text[]
)
RETURNS double precision
AS $$
DECLARE
BEGIN
IF rast1 IS NOT NULL AND rast2 IS NOT NULL THEN
RETURN rast1;
ELSE
RETURN NULL;
END IF;
RETURN NULL;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;
CREATE OR REPLACE FUNCTION raster_mapalgebra_union(
rast1 double precision,
rast2 double precision,
VARIADIC userargs text[]
)
RETURNS double precision
AS $$
DECLARE
BEGIN
CASE
WHEN rast1 IS NOT NULL AND rast2 IS NOT NULL THEN
RETURN ((rast1 + rast2)/2.);
WHEN rast1 IS NULL AND rast2 IS NULL THEN
RETURN NULL;
WHEN rast1 IS NULL THEN
RETURN rast2;
ELSE
RETURN rast1;
END CASE;
RETURN NULL;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;
CREATE OR REPLACE FUNCTION raster_mapalgebra_first(
rast1 double precision,
rast2 double precision,
VARIADIC userargs text[]
)
RETURNS double precision
AS $$
DECLARE
BEGIN
CASE
WHEN rast1 IS NOT NULL AND rast2 IS NOT NULL THEN
RETURN NULL;
WHEN rast1 IS NOT NULL THEN
RETURN rast1;
ELSE
RETURN NULL;
END CASE;
RETURN NULL;
END;
$$ LANGUAGE 'plpgsql' IMMUTABLE;
CREATE OR REPLACE FUNCTION raster_mapalgebra_second(
rast1 double precision,
rast2 double precision,
VARIADIC userargs text[]
)
RETURNS double precision
AS $$
DECLARE
BEGIN
CASE
WHEN rast1 IS NOT NULL AND rast2 IS NOT NULL THEN
RETURN NULL;
WHEN rast2 IS NOT NULL THEN
RETURN rast2;
ELSE
RETURN NULL;
END CASE;
RETURN NULL;
END;
$$ LANGUAGE 'plpgsql';
-- INTERSECTION
INSERT INTO raster_mapalgebra_out
(SELECT r1.rid, r2.rid, 'INTERSECTION', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_intersection(double precision, double precision, int[], text[])'::regprocedure, '32BF', 'INTERSECTION'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 0
AND r2.rid BETWEEN 1 AND 9
) UNION ALL (
SELECT r1.rid, r2.rid, 'INTERSECTION', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_intersection(double precision, double precision, int[], text[])'::regprocedure, '32BF', 'INTERSECTION'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 10
AND r2.rid BETWEEN 11 AND 19)
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, rid, 'INTERSECTION', st_mapalgebrafct(
NULL::raster, rast, 'raster_mapalgebra_intersection(double precision, double precision, int[], text[])'::regprocedure, '32BF', 'INTERSECTION'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT rid, NULL AS rid, 'INTERSECTION', st_mapalgebrafct(
rast, NULL::raster, 'raster_mapalgebra_intersection(double precision, double precision, int[], text[])'::regprocedure, '32BF', 'INTERSECTION'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, NULL AS rid, 'INTERSECTION', st_mapalgebrafct(
NULL::raster, NULL::raster, 'raster_mapalgebra_intersection(double precision, double precision, int[], text[])'::regprocedure, '32BF', 'INTERSECTION'
)
;
-- UNION
INSERT INTO raster_mapalgebra_out
(SELECT r1.rid, r2.rid, 'UNION', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_union(double precision, double precision, text[])'::regprocedure, '32BF', 'UNION'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 0
AND r2.rid BETWEEN 1 AND 9
) UNION ALL (
SELECT r1.rid, r2.rid, 'UNION', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_union(double precision, double precision, text[])'::regprocedure, '32BF', 'UNION'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 10
AND r2.rid BETWEEN 11 AND 19)
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, rid, 'UNION', st_mapalgebrafct(
NULL::raster, rast, 'raster_mapalgebra_union(double precision, double precision, text[])'::regprocedure, '32BF', 'UNION'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT rid, NULL AS rid, 'UNION', st_mapalgebrafct(
rast, NULL::raster, 'raster_mapalgebra_union(double precision, double precision, text[])'::regprocedure, '32BF', 'UNION'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, NULL AS rid, 'UNION', st_mapalgebrafct(
NULL::raster, NULL::raster, 'raster_mapalgebra_union(double precision, double precision, text[])'::regprocedure, '32BF', 'UNION'
)
;
-- FIRST
INSERT INTO raster_mapalgebra_out
(SELECT r1.rid, r2.rid, 'FIRST', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_first(double precision, double precision, text[])'::regprocedure, '32BF', 'FIRST'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 0
AND r2.rid BETWEEN 1 AND 9
) UNION ALL (
SELECT r1.rid, r2.rid, 'FIRST', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_first(double precision, double precision, text[])'::regprocedure, '32BF', 'FIRST'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 10
AND r2.rid BETWEEN 11 AND 19)
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, rid, 'FIRST', st_mapalgebrafct(
NULL::raster, rast, 'raster_mapalgebra_first(double precision, double precision, text[])'::regprocedure, '32BF', 'FIRST'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT rid, NULL AS rid, 'FIRST', st_mapalgebrafct(
rast, NULL::raster, 'raster_mapalgebra_first(double precision, double precision, text[])'::regprocedure, '32BF', 'FIRST'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, NULL AS rid, 'FIRST', st_mapalgebrafct(
NULL::raster, NULL::raster, 'raster_mapalgebra_first(double precision, double precision, text[])'::regprocedure, '32BF', 'FIRST'
)
;
-- SECOND
INSERT INTO raster_mapalgebra_out
(SELECT r1.rid, r2.rid, 'SECOND', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_second(double precision, double precision, text[])'::regprocedure, '32BF', 'SECOND'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 0
AND r2.rid BETWEEN 1 AND 9
) UNION ALL (
SELECT r1.rid, r2.rid, 'SECOND', st_mapalgebrafct(
r1.rast, r2.rast, 'raster_mapalgebra_second(double precision, double precision, text[])'::regprocedure, '32BF', 'SECOND'
)
FROM raster_mapalgebra r1
JOIN raster_mapalgebra r2
ON r1.rid != r2.rid
WHERE r1.rid = 10
AND r2.rid BETWEEN 11 AND 19)
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, rid, 'SECOND', st_mapalgebrafct(
NULL::raster, rast, 'raster_mapalgebra_second(double precision, double precision, text[])'::regprocedure, '32BF', 'SECOND'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT rid, NULL AS rid, 'SECOND', st_mapalgebrafct(
rast, NULL::raster, 'raster_mapalgebra_second(double precision, double precision, text[])'::regprocedure, '32BF', 'SECOND'
)
FROM raster_mapalgebra
;
INSERT INTO raster_mapalgebra_out
SELECT NULL AS rid, NULL AS rid, 'SECOND', st_mapalgebrafct(
NULL::raster, NULL::raster, 'raster_mapalgebra_second(double precision, double precision, text[])'::regprocedure, '32BF', 'SECOND'
)
;
-- output
SELECT
rid1,
rid2,
extent,
round(upperleftx::numeric, 3) AS upperleftx,
round(upperlefty::numeric, 3) AS upperlefty,
width,
height,
round(scalex::numeric, 3) AS scalex,
round(scaley::numeric, 3) AS scaley,
round(skewx::numeric, 3) AS skewx,
round(skewy::numeric, 3) AS skewy,
srid,
numbands,
pixeltype,
round(nodatavalue::numeric, 3) AS nodatavalue,
round(firstvalue::numeric, 3) AS firstvalue,
round(lastvalue::numeric, 3) AS lastvalue
FROM (
SELECT
rid1,
rid2,
extent,
(ST_Metadata(rast)).*,
(ST_BandMetadata(rast, 1)).*,
ST_Value(rast, 1, 1, 1) AS firstvalue,
ST_Value(rast, 1, ST_Width(rast), ST_Height(rast)) AS lastvalue
FROM raster_mapalgebra_out
) AS r;
DROP FUNCTION IF EXISTS raster_mapalgebra_intersection(double precision, double precision, int[], VARIADIC text[]);
DROP FUNCTION IF EXISTS raster_mapalgebra_union(double precision, double precision, VARIADIC text[]);
DROP FUNCTION IF EXISTS raster_mapalgebra_first(double precision, double precision, VARIADIC text[]);
DROP FUNCTION IF EXISTS raster_mapalgebra_second(double precision, double precision, VARIADIC text[]);
DROP TABLE IF EXISTS raster_mapalgebra;
DROP TABLE IF EXISTS raster_mapalgebra_out;
|
