Thanks Mark. I will indeed do the st_dump, but I don't think it will help much
(very few multis). I think the tiling will help a lot. What I wonder, though,
is how long it will take to tile? Afterall, it's still an st_intersection
operation to tile each geometry against each tile.
Is there
Hi,
I have:
POSTGIS=2.1.5 r13152 GEOS=3.4.2-CAPI-1.8.2 r0 PROJ=Rel. 4.8.0, 6 March
2012 GDAL=GDAL 1.11.1, released 2014/09/24 LIBXML=2.7.8 LIBJSON=UNKNOWN
RASTER
and
SELECT ST_Clip(ST_MakeEmptyRaster(42, 42, 0, 0, 1.0, 1.0, 0, 0, 4269),
ST_MakeEnvelope(0, 0, 20, 20, 4269));
crashed my
File a bug. It shouldn't work for an empty raster.
On Tue, Feb 24, 2015 at 6:50 AM, Pierre Racine pierre.rac...@sbf.ulaval.ca
wrote:
Hi,
I have:
POSTGIS=2.1.5 r13152 GEOS=3.4.2-CAPI-1.8.2 r0 PROJ=Rel. 4.8.0, 6
March 2012 GDAL=GDAL 1.11.1, released 2014/09/24 LIBXML=2.7.8
LIBJSON=UNKNOWN
On Tue, Feb 24, 2015 at 09:50:00AM -0500, Pierre Racine wrote:
Hi,
I have:
POSTGIS=2.1.5 r13152 GEOS=3.4.2-CAPI-1.8.2 r0 PROJ=Rel. 4.8.0, 6 March
2012 GDAL=GDAL 1.11.1, released 2014/09/24 LIBXML=2.7.8
LIBJSON=UNKNOWN RASTER
and
SELECT ST_Clip(ST_MakeEmptyRaster(42, 42, 0, 0,
I think when the ST_Clip() crop parameter is set to TRUE, ST_Clip() could just
change the extent of the empty raster When it is set to false, it just
returns the raster unmodified.
I'll fill a bug.
Thanks,
Pierre
-Original Message-
From: postgis-users-boun...@lists.osgeo.org
Following advice from Mark and Remi, I am now tiling the troublesome layer.
It's not going quickly. I'm trying an intersection of the layer with only 5 of
my 10kmX10km grids and it has been running for 30 min. I have 8680 grids,
which is more features than the layer I was originally working
Hey,
I highjack this interesting discussion, sorry =)
If you have one single massive Polygon (no multi).
You can generate a point table (keeping path of course) with ST_DumpPoints.
Then you construct an index on this table.
Then you perform your Intersection with indexed points, which will be
The land cover data you’re working with - does it come as a raster? We need a
strategy for busting up that single, monolithic poly with lots of holes.
If its a raster, then I think that tiling on import would be of huge benefit.
I’m just under the pump the next few days.
Thanks Mark. I will indeed do the st_dump, but I don't think it will help
much (very few multis). I think the tiling will help a lot. What I wonder,
though, is how long it will take to tile? Afterall, it's still an
st_intersection operation to tile each geometry against each tile.
