This function computes the best pyramid level based on the world space, width, and height of a viewport.
Syntax
integer ST_BestPyramidLevel(raster rast, Box extent, integer width, integer height);
Parameters
Parameter | Description |
---|---|
rast | The raster object. |
box | The world space of the viewport, in the format of ((minX,minY),(maxX,maxY)) .
|
width | The width of the viewport, in pixels. |
height | The height of the viewport, in pixels. |
Description
The raster object must have a valid spatial reference system identifier (SRID).
Examples
Select ST_BestPyramidLevel(raster_obj, '((128.0, 30.0),(128.5, 30.5))', 800, 600) from raster_table where id = 10;
---------------------
3