ST_SetGeoReference
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名称

ST_SetGeoReference — 在一次调用中设置 Georeference 6 地理配准参数。 数字应该用空格分隔。 接受 GDAL 或 ESRI 格式的输入。 默认为 GDAL。

大纲

raster ST_SetGeoReference(raster rast, text georefcoords, text format=GDAL);

raster ST_SetGeoReference(raster rast, double precision upperleftx, double precision upperlefty, double precision scalex, double precision scaley, double precision skewx, double precision skewy);

Description

在一次调用中设置 Georeference 6 地理配准参数。 接受“GDAL”或“ESRI”格式的输入。 默认为 GDAL。 如果未提供 6 个坐标，则返回 null。

格式表示的区别如下：

GDAL uses the value order shown below.

Code
scalex skewy skewx scaley upperleftx upperlefty

ESRI uses the value order shown below.

Code
scalex skewy skewx scaley upperleftx + scalex*0.5 upperlefty + scaley*0.5
[注意]

如果栅格具有数据库外波段，则更改地理参考可能会导致无法正确访问该波段的外部存储数据。

增强：2.1.0 添加 ST_SetGeoReference(raster, double precision, ...) 变体

示例

Code
WITH source AS (
    SELECT ST_MakeEmptyRaster(5, 5, 0, 0, 1, -1, 0, 0, 0) AS rast
), variants AS (
    SELECT 0 AS rid, rast FROM source
    UNION ALL
    SELECT 1, ST_SetGeoReference(rast, '10 0 0 -10 0.1 0.1', 'GDAL')
    FROM source
    UNION ALL
    SELECT 2, ST_SetGeoReference(rast, '10 0 0 -10 5.1 -4.9', 'ESRI')
    FROM source
    UNION ALL
    SELECT 3, ST_SetGeoReference(rast, 1, 1, 10, -10, 0.001, 0.001)
    FROM source
)
SELECT
    rid,
    round(ST_UpperLeftX(rast)::numeric, 3) AS upperleftx,
    round(ST_UpperLeftY(rast)::numeric, 3) AS upperlefty,
    ST_ScaleX(rast) AS scalex,
    ST_ScaleY(rast) AS scaley,
    ST_SkewX(rast) AS skewx,
    ST_SkewY(rast) AS skewy
FROM variants
ORDER BY rid;
栅格输出
rid | upperleftx | upperlefty | scalex | scaley | skewx | skewy
-----+------------+------------+--------+--------+-------+-------
   0 |      0.000 |      0.000 |      1 |     -1 |     0 |     0
   1 |      0.100 |      0.100 |     10 |    -10 |     0 |     0
   2 |      0.100 |      0.100 |     10 |    -10 |     0 |     0
   3 |      1.000 |      1.000 |     10 |    -10 | 0.001 | 0.001
(4 rows)