1020x24798 so more than 25 000 000 polygons... or pixels... So if I understand well you want to assign some values to each of those cells based on a vector coverage (of how many polygons)?
> -----Original Message----- > From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users- > boun...@postgis.refractions.net] On Behalf Of Ed Linde > Sent: Thursday, March 22, 2012 4:43 PM > To: PostGIS Users Discussion > Subject: Re: [postgis-users] ST_Buffer + grid problem > > So far no proper raster, because the following failed, but maybe the polygon > gives us an idea? This polygon is the extent of all the road geometries in > Denmark. Also I remember that when you did the raster at your end you said it > worked. Is 0.000036 degrees = 4m correct if I want to get a 4m by 4m cell > sized > uniform raster grid? > > select ST_AsRaster( ST_GeomFromText('POLYGON((8.07734039737749 > 54.4984986588244,8.07734039737749 57.7505109647578,15.1919565742587 > 57.7505109647578,15.1919565742587 54.4984986588244,8.07734039737749 > 54.4984986588244))'), 0.000036, 0.000036); > > > On Thu, Mar 22, 2012 at 9:39 PM, Pierre Racine <pierre.rac...@sbf.ulaval.ca> > wrote: > > > > Thanks. The raster I need to visualise is a 4m by 4m grid on the > entire > map of > > Denmark! :) So do you classify that as a large raster? If so is there > a > way to see a > > portion of it or something? > > I just want to manually check for a few areas on the map that the > intersection > > indeed works as expected and things haven't gone awry thanks to > projection > > differences or that I had degrees instead of meters or some such > thing. Well, I > > still have to first test if this GDAL upgrade will fix things and if > make > empty raster > > .. makes a difference. > > > That must be big but Danemark is a small country ;-) Only width and > height tell you if a raster is big. > > In the database, your grid is a set of rectangular geometry (how many?) > or just a big raster now (width & height)? > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
