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|
SET client_min_messages TO warning;
/*
1 1 1 1 1 1 1 1 1
1 2 2 2 1 2 2 2 1
1 2 3 2 2 2 3 2 1
1 2 2 2 1 2 2 2 1
1 1 2 1 3 1 2 1 1
1 2 2 2 1 2 2 2 1
1 2 3 2 2 2 3 2 1
1 2 2 2 1 2 2 2 1
1 1 1 1 1 1 1 1 1
*/
DROP TABLE IF EXISTS raster_elevation;
CREATE TABLE raster_elevation (rid integer, rast raster);
DROP TABLE IF EXISTS raster_elevation_out;
CREATE TABLE raster_elevation_out (rid integer, functype text, rast raster);
INSERT INTO raster_elevation
SELECT
0 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(9, 9, 0, 0, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 2, 2, 2, 1, 2, 2, 2, 1],
[1, 2, 3, 2, 2, 2, 3, 2, 1],
[1, 2, 2, 2, 1, 2, 2, 2, 1],
[1, 1, 2, 1, 3, 1, 2, 1, 1],
[1, 2, 2, 2, 1, 2, 2, 2, 1],
[1, 2, 3, 2, 2, 2, 3, 2, 1],
[1, 2, 2, 2, 1, 2, 2, 2, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1]
]::double precision[]
) AS rast
;
INSERT INTO raster_elevation
SELECT
1 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[1, 1, 1],
[1, 2, 2],
[1, 2, 3]
]::double precision[]
) AS rast
UNION ALL
SELECT
2 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 0, -3, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[1, 2, 2],
[1, 1, 2],
[1, 2, 2]
]::double precision[]
) AS rast
UNION ALL
SELECT
3 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 0, -6, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[1, 2, 3],
[1, 2, 2],
[1, 1, 1]
]::double precision[]
) AS rast
UNION ALL
SELECT
4 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 3, 0, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[1, 1, 1],
[2, 1, 2],
[2, 2, 2]
]::double precision[]
) AS rast
UNION ALL
SELECT
5 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 3, -3, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[2, 1, 2],
[1, 3, 1],
[2, 1, 2]
]::double precision[]
) AS rast
UNION ALL
SELECT
6 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 3, -6, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[2, 2, 2],
[2, 1, 2],
[1, 1, 1]
]::double precision[]
) AS rast
UNION ALL
SELECT
7 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 6, 0, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[1, 1, 1],
[2, 2, 1],
[3, 2, 1]
]::double precision[]
) AS rast
UNION ALL
SELECT
8 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 6, -3, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[2, 2, 1],
[2, 1, 1],
[2, 2, 1]
]::double precision[]
) AS rast
UNION ALL
SELECT
9 AS rid,
ST_SetValues(
ST_AddBand(ST_MakeEmptyRaster(3, 3, 6, -6, 1, -1, 0, 0, 0), 1, '32BF', 0, -9999),
1, 1, 1, ARRAY[
[3, 2, 1],
[2, 2, 1],
[1, 1, 1]
]::double precision[]
) AS rast
;
/* ST_Slope */
INSERT INTO raster_elevation_out
SELECT
rid,
'slope',
ST_Slope(rast)
FROM raster_elevation
WHERE rid = 0
UNION ALL
SELECT
rid,
'aspect',
ST_Aspect(rast)
FROM raster_elevation
WHERE rid = 0
UNION ALL
SELECT
rid,
'hillshade',
ST_Hillshade(rast)
FROM raster_elevation
WHERE rid = 0
;
/* with coverage */
DO $$
BEGIN
-- this ONLY works for PostgreSQL version 9.1 or higher
IF array_to_string(regexp_matches(split_part(version(), ' ', 2), E'([0-9]+)\.([0-9]+)'), '')::int > 90 THEN
INSERT INTO raster_elevation_out (
SELECT
t1.rid,
'slope',
ST_Slope(ST_Union(t2.rast), 1, t1.rast) AS rast
FROM raster_elevation t1
CROSS JOIN raster_elevation t2
WHERE t1.rid != 0
AND t2.rid != 0
AND ST_Intersects(t1.rast, t2.rast)
GROUP BY t1.rid, t1.rast
ORDER BY t1.rid
) UNION ALL (
SELECT
t1.rid,
'aspect',
ST_Aspect(ST_Union(t2.rast), 1, t1.rast) AS rast
FROM raster_elevation t1
CROSS JOIN raster_elevation t2
WHERE t1.rid != 0
AND t2.rid != 0
AND ST_Intersects(t1.rast, t2.rast)
GROUP BY t1.rid, t1.rast
ORDER BY t1.rid
) UNION ALL (
SELECT
t1.rid,
'hillshade',
ST_Hillshade(ST_Union(t2.rast), 1, t1.rast) AS rast
FROM raster_elevation t1
CROSS JOIN raster_elevation t2
WHERE t1.rid != 0
AND t2.rid != 0
AND ST_Intersects(t1.rast, t2.rast)
GROUP BY t1.rid, t1.rast
ORDER BY t1.rid
);
ELSE
INSERT INTO raster_elevation_out (
WITH foo AS (
SELECT
t1.rid,
ST_Union(t2.rast) AS rast
FROM raster_elevation t1
JOIN raster_elevation t2
ON ST_Intersects(t1.rast, t2.rast)
AND t1.rid != 0
AND t2.rid != 0
GROUP BY t1.rid
)
SELECT
t1.rid,
'slope',
ST_Slope(t2.rast, 1, t1.rast) AS rast
FROM raster_elevation t1
JOIN foo t2
ON t1.rid = t2.rid
ORDER BY t1.rid
) UNION ALL (
WITH foo AS (
SELECT
t1.rid,
ST_Union(t2.rast) AS rast
FROM raster_elevation t1
JOIN raster_elevation t2
ON ST_Intersects(t1.rast, t2.rast)
AND t1.rid != 0
AND t2.rid != 0
GROUP BY t1.rid
)
SELECT
t1.rid,
'aspect',
ST_Aspect(t2.rast, 1, t1.rast) AS rast
FROM raster_elevation t1
JOIN foo t2
ON t1.rid = t2.rid
ORDER BY t1.rid
) UNION ALL (
WITH foo AS (
SELECT
t1.rid,
ST_Union(t2.rast) AS rast
FROM raster_elevation t1
JOIN raster_elevation t2
ON ST_Intersects(t1.rast, t2.rast)
AND t1.rid != 0
AND t2.rid != 0
GROUP BY t1.rid
)
SELECT
t1.rid,
'hillshade',
ST_Hillshade(t2.rast, 1, t1.rast) AS rast
FROM raster_elevation t1
JOIN foo t2
ON t1.rid = t2.rid
ORDER BY t1.rid
);
END IF;
END $$;
WITH foo AS (
SELECT
rid,
functype,
ST_PixelAsPoints(rast) AS papt
FROM raster_elevation_out
)
SELECT
rid,
functype,
(papt).x,
(papt).y,
round((papt).val::numeric, 6) AS val
FROM foo
ORDER BY 2, 1, 4, 3;
DROP TABLE IF EXISTS raster_elevation_out;
DROP TABLE IF EXISTS raster_elevation;
-- ST_TPI
DROP TABLE IF EXISTS raster_value_arrays;
CREATE TABLE raster_value_arrays (
id integer,
val double precision[][]
);
CREATE OR REPLACE FUNCTION make_value_array(
rows integer DEFAULT 3,
columns integer DEFAULT 3,
start_val double precision DEFAULT 1,
step double precision DEFAULT 1,
skip_expr text DEFAULT NULL
)
RETURNS double precision[][][]
AS $$
DECLARE
x int;
y int;
value double precision;
values double precision[][][];
result boolean;
expr text;
BEGIN
value := start_val;
values := array_fill(NULL::double precision, ARRAY[1, columns, rows]);
FOR y IN 1..columns LOOP
FOR x IN 1..rows LOOP
IF skip_expr IS NULL OR length(skip_expr) < 1 THEN
result := TRUE;
ELSE
expr := replace(skip_expr, '[v]'::text, value::text);
EXECUTE 'SELECT (' || expr || ')::boolean' INTO result;
END IF;
IF result IS TRUE THEN
values[1][y][x] := value;
END IF;
value := value + step;
END LOOP;
END LOOP;
RETURN values;
END;
$$ LANGUAGE 'plpgsql';
INSERT INTO raster_value_arrays VALUES
(1, make_value_array()),
(2, make_value_array(3, 3, 15, -1)),
(3, make_value_array(3, 3, 1, 2)),
(4, make_value_array(3, 3, 1, 1, '0')),
(5, make_value_array(3, 3, 1, 1, '[v] % 2')),
(6, make_value_array(3, 3, 1, 1, '([v] % 2) = 0')),
(7, make_value_array(3, 3, 1, 2.1, '([v] NOT IN (7.3, 9.4, 15.7, 17.8))')),
(8, make_value_array(3, 3, 0, 3.14, '([v] IN (3.14, 12.56, 25.12))')),
(9, make_value_array(3, 3, 1, 1, '[v] > 8')),
(10,make_value_array(3,3,3.14,12)),
(11,make_value_array(3,3,2.11,11));
SELECT
id,
val,
round(_st_tpi4ma(val,NULL,NULL)::numeric, 6) as tpi
FROM raster_value_arrays
ORDER BY id;
SELECT
id,
val,
round(_st_roughness4ma(val,NULL,NULL)::numeric, 6) as roughness
FROM raster_value_arrays
ORDER BY id;
SELECT
id,
val,
round(_st_tri4ma(val,NULL,NULL)::numeric, 6) as tri
FROM raster_value_arrays
ORDER BY id;
DROP TABLE IF EXISTS raster_value_arrays;
DROP FUNCTION IF EXISTS make_value_array(integer,integer,double precision, double precision, text);
|
