ST_SetValues — 지정한 밴드의 값들을 설정해서 나온 수정된 래스터를 반환합니다.
raster ST_SetValues(raster rast, integer nband, integer columnx, integer rowy, double precision[][] newvalueset, boolean[][] noset=NULL, boolean keepnodata=FALSE);
raster ST_SetValues(raster rast, integer nband, integer columnx, integer rowy, double precision[][] newvalueset, double precision nosetvalue, boolean keepnodata=FALSE);
raster ST_SetValues(raster rast, integer nband, integer columnx, integer rowy, integer width, integer height, double precision newvalue, boolean keepnodata=FALSE);
raster ST_SetValues(raster rast, integer columnx, integer rowy, integer width, integer height, double precision newvalue, boolean keepnodata=FALSE);
raster ST_SetValues(raster rast, integer nband, geomval[] geomvalset, boolean keepnodata=FALSE);
지정한 밴드에 대해, 설정한 픽셀들을 새로운 값(들)로 설정해서 나온 수정된 래스터를 반환합니다.
keepnodata 가 TRUE일 경우, NODATA 값인 픽셀들을 newvalueset 에 있는 상응하는 값으로 설정하지 않을 것입니다.
변종 1의 경우, columnx, rowy 픽셀 좌표 및 newvalueset 배열의 차원이 설정 대상 픽셀들을 결정합니다. 이미 newvalueset 에 있는 값들을 가진 픽셀을 중복 설정하는 것을 막기 위해 noset 을 이용할 수 있습니다(PostgreSQL이 이가 빠진 배열을 허용하지 않기 때문입니다). 변종 1 예시를 참조하십시오.
변종 2는 변종 1과 비슷하지만, 불 값인 noset 배열 대신 단순한 이중 정밀도 데이터형인 nosetvalue 를 입력받습니다. newvalueset 가운데 nosetvalue 값을 가진 구성 요소를 무시할 것입니다. 변종 2 예시를 참조하십시오.
변종 3의 경우, columnx, rowy 픽셀 좌표, width 및 height 가 설정 대상 픽셀들을 결정합니다. 변종 3 예시를 참조하십시오.
변종 4는 rast 의 첫 번째 밴드의 픽셀들이 설정될 것이라고 가정하는 점만 제외하면 변종 3과 동일합니다.
변종 5의 경우, 설정 대상 픽셀들을 결정하는 데 geomval 의 배열을 이용합니다. 배열 안의 도형들이 모두 POINT 또는 MULTIPOINT일 경우, 이 함수는 각 포인트의 경도와 위도를 써서 직접 픽셀을 설정하는 지름길을 이용합니다. 그렇지 않을 경우, 도형을 래스터로 변환한 다음 동일한 방식으로 반복합니다. 변종 5 예시를 참조하십시오.
2.1.0 버전부터 사용할 수 있습니다.
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 1 | 1 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | =
> | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 2, 2, ARRAY[[9, 9], [9, 9]]::double precision[][]
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 1
1 | 2 | 1
1 | 3 | 1
2 | 1 | 1
2 | 2 | 9
2 | 3 | 9
3 | 1 | 1
3 | 2 | 9
3 | 3 | 9
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 9 | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | =
> | 9 | | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 9 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 1, 1, ARRAY[[9, 9, 9], [9, NULL, 9], [9, 9, 9]]::double precision[][]
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 9
1 | 2 | 9
1 | 3 | 9
2 | 1 | 9
2 | 2 |
2 | 3 | 9
3 | 1 | 9
3 | 2 | 9
3 | 3 | 9
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 9 | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | => | 1 | | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 9 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 1, 1,
ARRAY[[9, 9, 9], [9, NULL, 9], [9, 9, 9]]::double precision[][],
ARRAY[[false], [true]]::boolean[][]
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 9
1 | 2 | 1
1 | 3 | 9
2 | 1 | 9
2 | 2 |
2 | 3 | 9
3 | 1 | 9
3 | 2 | 9
3 | 3 | 9
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| | 1 | 1 | | | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | => | 1 | | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 9 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_SetValue(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 1, 1, NULL
),
1, 1, 1,
ARRAY[[9, 9, 9], [9, NULL, 9], [9, 9, 9]]::double precision[][],
ARRAY[[false], [true]]::boolean[][],
TRUE
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 |
1 | 2 | 1
1 | 3 | 9
2 | 1 | 9
2 | 2 |
2 | 3 | 9
3 | 1 | 9
3 | 2 | 9
3 | 3 | 9
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 1 | 1 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | => | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 1, 1, ARRAY[[-1, -1, -1], [-1, 9, 9], [-1, 9, 9]]::double precision[][], -1
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 1
1 | 2 | 1
1 | 3 | 1
2 | 1 | 1
2 | 2 | 9
2 | 3 | 9
3 | 1 | 1
3 | 2 | 9
3 | 3 | 9
/*
This example is like the previous one. Instead of nosetvalue = -1, nosetvalue = NULL
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 1 | 1 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | => | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 1, 1, ARRAY[[NULL, NULL, NULL], [NULL, 9, 9], [NULL, 9, 9]]::double precision[][], NULL::double precision
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 1
1 | 2 | 1
1 | 3 | 1
2 | 1 | 1
2 | 2 | 9
2 | 3 | 9
3 | 1 | 1
3 | 2 | 9
3 | 3 | 9
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 1 | 1 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | => | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 2, 2, 2, 2, 9
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 1
1 | 2 | 1
1 | 3 | 1
2 | 1 | 1
2 | 2 | 9
2 | 3 | 9
3 | 1 | 1
3 | 2 | 9
3 | 3 | 9
/*
The ST_SetValues() does the following...
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 1 | 1 |
+ - + - + - + + - + - + - +
| 1 | | 1 | => | 1 | | 9 |
+ - + - + - + + - + - + - +
| 1 | 1 | 1 | | 1 | 9 | 9 |
+ - + - + - + + - + - + - +
*/
SELECT
(poly).x,
(poly).y,
(poly).val
FROM (
SELECT
ST_PixelAsPolygons(
ST_SetValues(
ST_SetValue(
ST_AddBand(
ST_MakeEmptyRaster(3, 3, 0, 0, 1, -1, 0, 0, 0),
1, '8BUI', 1, 0
),
1, 2, 2, NULL
),
1, 2, 2, 2, 2, 9, TRUE
)
) AS poly
) foo
ORDER BY 1, 2;
x | y | val
---+---+-----
1 | 1 | 1
1 | 2 | 1
1 | 3 | 1
2 | 1 | 1
2 | 2 |
2 | 3 | 9
3 | 1 | 1
3 | 2 | 9
3 | 3 | 9
WITH foo AS (
SELECT 1 AS rid, ST_AddBand(ST_MakeEmptyRaster(5, 5, 0, 0, 1, -1, 0, 0, 0), 1, '8BUI', 0, 0) AS rast
), bar AS (
SELECT 1 AS gid, 'SRID=0;POINT(2.5 -2.5)'::geometry geom UNION ALL
SELECT 2 AS gid, 'SRID=0;POLYGON((1 -1, 4 -1, 4 -4, 1 -4, 1 -1))'::geometry geom UNION ALL
SELECT 3 AS gid, 'SRID=0;POLYGON((0 0, 5 0, 5 -1, 1 -1, 1 -4, 0 -4, 0 0))'::geometry geom UNION ALL
SELECT 4 AS gid, 'SRID=0;MULTIPOINT(0 0, 4 4, 4 -4)'::geometry
)
SELECT
rid, gid, ST_DumpValues(ST_SetValue(rast, 1, geom, gid))
FROM foo t1
CROSS JOIN bar t2
ORDER BY rid, gid;
rid | gid | st_dumpvalues
-----+-----+---------------------------------------------------------------------------------------------------------------------------------------------
1 | 1 | (1,"{{NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL},{NULL,NULL,1,NULL,NULL},{NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL}}")
1 | 2 | (1,"{{NULL,NULL,NULL,NULL,NULL},{NULL,2,2,2,NULL},{NULL,2,2,2,NULL},{NULL,2,2,2,NULL},{NULL,NULL,NULL,NULL,NULL}}")
1 | 3 | (1,"{{3,3,3,3,3},{3,NULL,NULL,NULL,NULL},{3,NULL,NULL,NULL,NULL},{3,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL}}")
1 | 4 | (1,"{{4,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,NULL},{NULL,NULL,NULL,NULL,4}}")
(4 rows)
다음은 배열 후반에 있는 geomvals가 전반의 geomvals를 덮어 쓸 수 있다는 사실을 보여주는 예시입니다.
WITH foo AS (
SELECT 1 AS rid, ST_AddBand(ST_MakeEmptyRaster(5, 5, 0, 0, 1, -1, 0, 0, 0), 1, '8BUI', 0, 0) AS rast
), bar AS (
SELECT 1 AS gid, 'SRID=0;POINT(2.5 -2.5)'::geometry geom UNION ALL
SELECT 2 AS gid, 'SRID=0;POLYGON((1 -1, 4 -1, 4 -4, 1 -4, 1 -1))'::geometry geom UNION ALL
SELECT 3 AS gid, 'SRID=0;POLYGON((0 0, 5 0, 5 -1, 1 -1, 1 -4, 0 -4, 0 0))'::geometry geom UNION ALL
SELECT 4 AS gid, 'SRID=0;MULTIPOINT(0 0, 4 4, 4 -4)'::geometry
)
SELECT
t1.rid, t2.gid, t3.gid, ST_DumpValues(ST_SetValues(rast, 1, ARRAY[ROW(t2.geom, t2.gid), ROW(t3.geom, t3.gid)]::geomval[]))
FROM foo t1
CROSS JOIN bar t2
CROSS JOIN bar t3
WHERE t2.gid = 1
AND t3.gid = 2
ORDER BY t1.rid, t2.gid, t3.gid;
rid | gid | gid | st_dumpvalues
-----+-----+-----+---------------------------------------------------------------------------------------------------------------------
1 | 1 | 2 | (1,"{{NULL,NULL,NULL,NULL,NULL},{NULL,2,2,2,NULL},{NULL,2,2,2,NULL},{NULL,2,2,2,NULL},{NULL,NULL,NULL,NULL,NULL}}")
(1 row)
이전 예시와 반대되는 상황을 보여주는 예시입니다.
WITH foo AS (
SELECT 1 AS rid, ST_AddBand(ST_MakeEmptyRaster(5, 5, 0, 0, 1, -1, 0, 0, 0), 1, '8BUI', 0, 0) AS rast
), bar AS (
SELECT 1 AS gid, 'SRID=0;POINT(2.5 -2.5)'::geometry geom UNION ALL
SELECT 2 AS gid, 'SRID=0;POLYGON((1 -1, 4 -1, 4 -4, 1 -4, 1 -1))'::geometry geom UNION ALL
SELECT 3 AS gid, 'SRID=0;POLYGON((0 0, 5 0, 5 -1, 1 -1, 1 -4, 0 -4, 0 0))'::geometry geom UNION ALL
SELECT 4 AS gid, 'SRID=0;MULTIPOINT(0 0, 4 4, 4 -4)'::geometry
)
SELECT
t1.rid, t2.gid, t3.gid, ST_DumpValues(ST_SetValues(rast, 1, ARRAY[ROW(t2.geom, t2.gid), ROW(t3.geom, t3.gid)]::geomval[]))
FROM foo t1
CROSS JOIN bar t2
CROSS JOIN bar t3
WHERE t2.gid = 2
AND t3.gid = 1
ORDER BY t1.rid, t2.gid, t3.gid;
rid | gid | gid | st_dumpvalues
-----+-----+-----+---------------------------------------------------------------------------------------------------------------------
1 | 2 | 1 | (1,"{{NULL,NULL,NULL,NULL,NULL},{NULL,2,2,2,NULL},{NULL,2,1,2,NULL},{NULL,2,2,2,NULL},{NULL,NULL,NULL,NULL,NULL}}")
(1 row)