説明

指定した行と列のピクセルの境界となるジオメトリを返します。

例

-- ラスタピクセルのポリゴンを得ます
SELECT i,j, ST_AsText(ST_PixelAsPolygon(foo.rast, i,j)) As b1pgeom
FROM dummy_rast As foo 
	CROSS JOIN generate_series(1,2) As i 
	CROSS JOIN generate_series(1,1) As j
WHERE rid=2;

 i | j |                                                    b1pgeom
---+---+-----------------------------------------------------------------------------
 1 | 1 | POLYGON((3427927.75 5793244,3427927.8 5793244,3427927.8 5793243.95,...
 2 | 1 | POLYGON((3427927.8 5793244,3427927.85 5793244,3427927.85 5793243.95, ..
  

関連情報

ST_DumpAsPolygons, ST_Intersection, ST_AsText