Hi,
I would like to make an operation between two tables with geometry
(polygon) - user's GIS call this operation a UNION.
I think this :
* Step1 : make st_intersection (where st_intersects) and obtains the 4
little square with attributes from the two table. I call the result
This all depends on the kind of operations you want to do... Some might be
easier keeping rasters as raster. Others are easier if you convert everything
to vector.
You can easily convert raster loaded in PostGIS to vector using
ST_DumpAsPolygons(). The reverse operation is done through a mix
Hi list,
I have some heat map files which I want to do some spatial analyisis on.
I am wondering what the best way to proceed. I admin that I have never used the
raster part of postgis before.
I have two choices
1. Convert the raster files to shape files and load the shape files in to
