ST_MetaData
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Name

ST_MetaData — 返回有关栅格对象的基本元数据，例如像素大小、旋转（倾斜）、左上、左下等。

Synopsis

record ST_MetaData(raster rast);

描述

返回有关栅格对象的基本元数据，例如像素大小、旋转（倾斜）、左上、左下等。返回的列： upperleftx | upperlefty | width | height | scalex | scaley | skewx | skewy | srid | numbands

示例

SELECT rid, (foo.md).*
 FROM (SELECT rid, ST_MetaData(rast) As md
FROM dummy_rast) As foo;

 rid | upperleftx | upperlefty | width | height | scalex | scaley | skewx | skewy | srid | numbands
 ----+------------+------------+-------+--------+--------+-----------+-------+-------+------+-------
   1 |        0.5 |        0.5 |    10 |     20 |      2 |      3 |     0 |     0 |    0 |        0
   2 | 3427927.75 |    5793244 |     5 |      5 |   0.05 |  -0.05 |     0 |     0 |    0 |        3