New answers tagged proj.4
In this other post, somebody mentions doing: sudo ln -s /usr/lib/libproj.so.0 /usr/lib/libproj.so Which absolutely fixed the same error (ERROR 6: Unable to load PROJ.4 library (libproj.so)) for me.
You have to do the intersection within the same CRS, so you have to reproject one layer to the other. In QGIS, you have to use Raster -> Projections -> Warp to convert the raster to WGS84. You might need to remove the LCC layer and turn OTF OFF to see them align. Check that QGIS has assigned the right CRS to the reprojected layer when loading. Save ...
If your data are in different CRS you have to reproject one of them. SELECT ST_Value(rast, geom) val FROM testraster5, pft_account WHERE ST_Intersects(rast, ST_Transform(geom, EPSG_YOUR_RASTER));
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