Hi Rémi,
My query was:
UPDATE hourly_positions hp SET landform =
(SELECT ST_Value(rast,hp.geom4326) FROM landforms4326_128 lf where (lf.rast
&& hp.geom4326) AND ST_Intersects(lf.rast,hp.geom4326))
You wrote: “your update is not safe because a point may intersect several
tiles.” I’d
Hi Rémi,
Thanks for the suggestion. I tiled the raster and added a ST_Intersects, and
the whole operation finished in just a couple of minutes (the previous version
hadn’t completed when I left it running overnight). The command I used was
this:
UPDATE hourly_positions hp SET landform
Hey,
I suppose your raster is correctly cut into small pieces.
You should first try to clock one point value retrieval.
It should be < 50ms (or you have an index issue)
Then you could force the use of index by writting a function
update_one_point(point) $$ update XXX set XXX WHERE
