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DROP TABLE IF EXISTS test_raster_convexhull;
CREATE TABLE test_raster_convexhull AS
SELECT ST_AddBand(ST_AddBand(ST_MakeEmptyRaster(9, 9, 0, 0, 1, -1, 0, 0, 0), 1, '8BUI', 0, 0), 2, '8BUI', 1, 0) AS rast;
SELECT
ST_AsText(ST_ConvexHull(rast)),
ST_AsText(ST_MinConvexHull(rast)),
ST_AsText(ST_MinConvexHull(rast, 1)),
ST_AsText(ST_MinConvexHull(rast, 2))
FROM test_raster_convexhull;
UPDATE test_raster_convexhull SET
rast = ST_SetValues(
rast, 1, 1, 1,
ARRAY[
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 1, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0]
]::double precision[][]
);
SELECT
ST_AsText(ST_MinConvexHull(rast, 1))
FROM test_raster_convexhull;
UPDATE test_raster_convexhull SET
rast = ST_SetValues(
rast, 1, 1, 1,
ARRAY[
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 1, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0]
]::double precision[][]
);
SELECT
ST_AsText(ST_MinConvexHull(rast, 1))
FROM test_raster_convexhull;
UPDATE test_raster_convexhull SET
rast = ST_SetValues(
rast, 1, 1, 1,
ARRAY[
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 1, 0, 0, 0],
[0, 0, 0, 1, 1, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0]
]::double precision[][]
);
SELECT
ST_AsText(ST_MinConvexHull(rast, 1))
FROM test_raster_convexhull;
UPDATE test_raster_convexhull SET
rast = ST_SetValues(
rast, 1, 1, 1,
ARRAY[
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 1],
[0, 0, 0, 1, 1, 0, 0, 0, 0],
[0, 0, 0, 1, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0]
]::double precision[][]
);
SELECT
ST_AsText(ST_MinConvexHull(rast, 1))
FROM test_raster_convexhull;
UPDATE test_raster_convexhull SET
rast = ST_SetValues(
rast, 2, 1, 1,
ARRAY[
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 0, 0, 0, 0, 1, 0, 0, 0],
[0, 0, 0, 0, 1, 1, 0, 0, 0],
[0, 0, 0, 0, 0, 1, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0]
]::double precision[][]
);
SELECT
ST_AsText(ST_MinConvexHull(rast, 2)),
ST_AsText(ST_MinConvexHull(rast))
FROM test_raster_convexhull;
UPDATE test_raster_convexhull SET
rast = ST_SetValues(
rast, 2, 1, 1,
ARRAY[
[0, 0, 0, 0, 0, 0, 0, 0, 1],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[1, 0, 0, 0, 0, 1, 0, 0, 0],
[0, 0, 0, 0, 1, 1, 0, 0, 0],
[0, 0, 0, 0, 0, 1, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 1, 0, 0, 0, 0, 0, 0]
]::double precision[][]
);
SELECT
ST_AsText(ST_MinConvexHull(rast, 1)),
ST_AsText(ST_MinConvexHull(rast, 2)),
ST_AsText(ST_MinConvexHull(rast))
FROM test_raster_convexhull;
DROP TABLE IF EXISTS test_raster_convexhull;
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