ST_BandMetaData
이전  11.5. 래스터 밴드 접근자  다음

제목

ST_BandMetaData — 지정 래스터 밴드에 대한 기본 메타데이터를 반환합니다. 밴드를 지정하지 않을 경우 밴드 1번이라고 가정합니다.

요약

(1) record ST_BandMetaData(raster rast, integer band=1);

(2) record ST_BandMetaData(raster rast, integer[] band);

Description

Returns basic meta data about a raster band. Columns returned: pixeltype, nodatavalue, isoutdb, path, outdbbandnum, filesize, filetimestamp.

[참고]

래스터가 어떤 밴드도 담고 있지 않을 경우 오류가 발생합니다.

[참고]

If band has no NODATA value, nodatavalue are NULL.

[참고]

If isoutdb is False, path, outdbbandnum, filesize and filetimestamp are NULL. If outdb access is disabled, filesize and filetimestamp will also be NULL.

Enhanced: 2.5.0 to include outdbbandnum, filesize and filetimestamp for outdb rasters.

예시

Variant 1.

Code
SELECT
    rid,
    (foo.md).*
FROM (
    SELECT
        rid,
        ST_BandMetaData(rast, 1) AS md
    FROM dummy_rast
    WHERE rid=2
) As foo;
래스터 출력
rid | pixeltype | nodatavalue | isoutdb | path | outdbbandnum
-----+-----------+-------------+---------+------+--------------
   2 | 8BUI      |           0 | f       |      |
(1 row)

Variant 2.

Code
WITH foo AS (
    SELECT
        ST_AddBand(NULL::raster, '/home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif', NULL::int[]) AS rast
)
SELECT
    bandnum,
    pixeltype,
    isoutdb,
    regexp_replace(path, '^.*/', '') AS file,
    outdbbandnum
FROM ST_BandMetaData((SELECT rast FROM foo),
    ARRAY[1, 3, 2]::int[]
);
래스터 출력
bandnum | pixeltype | isoutdb |     file      | outdbbandnum
---------+-----------+---------+---------------+--------------
       1 | 8BUI      | t       | Projected.tif |            1
       3 | 8BUI      | t       | Projected.tif |            3
       2 | 8BUI      | t       | Projected.tif |            2