名称
ST_PixelAsPoints — 返回栅格波段的每个像素的点几何图形以及每个像素的值、X 和 Y 栅格坐标。 点几何的坐标是像素的左上角。
大纲
setof record ST_PixelAsPoints(raster rast, integer band=1, boolean exclude_nodata_value=TRUE);
Description
返回栅格波段的每个像素的点几何图形以及每个像素的值、X 和 Y 栅格坐标。 点几何的坐标是像素的左上角。
返回记录格式：geom geometry，val双精度，x整数，y整数。
![[注意]](../images/note.png)
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可用性：2.1.0
更改：2.1.1 更改了 except_nodata_value 的行为。
示例
This example returns point features together with a derived marker size that a client can use for value-scaled point rendering.
Code
SELECT
x,
y,
val,
round((val / 32.0)::numeric, 2) AS marker_scale,geom AS geom
FROM (
SELECT (ST_PixelAsPoints(rast, 1)).*
FROM dummy_rast
WHERE rid = 2
) AS foo
ORDER BY y, x;
栅格输出
x | y | val | marker_scale | geom ---+---+-----+--------------+------------------------------ 1 | 1 | 253 | 7.91 | POINT(3427927.75 5793244) 2 | 1 | 254 | 7.94 | POINT(3427927.8 5793244) 3 | 1 | 253 | 7.91 | POINT(3427927.85 5793244) 4 | 1 | 254 | 7.94 | POINT(3427927.9 5793244) 5 | 1 | 254 | 7.94 | POINT(3427927.95 5793244) 1 | 2 | 253 | 7.91 | POINT(3427927.75 5793243.95) 2 | 2 | 254 | 7.94 | POINT(3427927.8 5793243.95) 3 | 2 | 254 | 7.94 | POINT(3427927.85 5793243.95) 4 | 2 | 253 | 7.91 | POINT(3427927.9 5793243.95) 5 | 2 | 249 | 7.78 | POINT(3427927.95 5793243.95) 1 | 3 | 250 | 7.81 | POINT(3427927.75 5793243.9) 2 | 3 | 254 | 7.94 | POINT(3427927.8 5793243.9) 3 | 3 | 254 | 7.94 | POINT(3427927.85 5793243.9) 4 | 3 | 252 | 7.88 | POINT(3427927.9 5793243.9) 5 | 3 | 249 | 7.78 | POINT(3427927.95 5793243.9) 1 | 4 | 251 | 7.84 | POINT(3427927.75 5793243.85) 2 | 4 | 253 | 7.91 | POINT(3427927.8 5793243.85) 3 | 4 | 254 | 7.94 | POINT(3427927.85 5793243.85) 4 | 4 | 254 | 7.94 | POINT(3427927.9 5793243.85) 5 | 4 | 253 | 7.91 | POINT(3427927.95 5793243.85) 1 | 5 | 252 | 7.88 | POINT(3427927.75 5793243.8) 2 | 5 | 250 | 7.81 | POINT(3427927.8 5793243.8) 3 | 5 | 254 | 7.94 | POINT(3427927.85 5793243.8) 4 | 5 | 254 | 7.94 | POINT(3427927.9 5793243.8) 5 | 5 | 254 | 7.94 | POINT(3427927.95 5793243.8)
Figure