Re: [postgis-users] Size of a multipolygon
Thanks Brent, Stephen, Clearly the answer was much to straightforward for me to find!! I blame a poorly constructed question. Thank you. On 02/05/2012, at 1:06 PM, pcr...@pcreso.com wrote: > & FYI, I was interested in this post, as a PL/R user it may interest you as > well? > > http://www.spatialdbadvisor.com/postgis_tips_tricks/290/r-based-delaunay-triangulation-function-for-postgis-using-the-deldir-package > Nice - I've used Regina's script before a couple of times, but I haven't had to worry about three dimensions. Once to define approximate postcode boundaries for Australia - it's possible to obtain a list of postcode points, but Australia Post specifically declines to produce a map showing which areas are covered by which postcodes (mainly because they are not simply distributed by distance - some people get their mail by plane once a week, a live over 1000km from 'their' post-office. But they are outliers from an epidemiological perspective. Also for mobile phone tower coverage - then truncating all the polygons at 35km from the centroid. We now use PL/R almost exclusively for data output (except for interactive maps) on web sites - including tables. cheers Ben > > Cheers, > > Brent > > > --- On Wed, 5/2/12, Ben Madin wrote: > > From: Ben Madin > Subject: [postgis-users] Size of a multipolygon > To: "PostGIS Users Discussion" > Date: Wednesday, May 2, 2012, 3:26 PM > > Hello all, > > I'm sure the answer is simple, but I'm lost on what to search on - I need to > quickly search through several thousand multi polygons for any which have > more than one part making them up. > > What is the best way to do this…? (I've tried array_length(), but don't seem > to be able to feed it the right part. I can't believe I can't find a function > that does it… or am I looking at dumping the multi polygons into a new table > and counting the number of lines for each one... > > cheers > > Ben > > > ___ > 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
Re: [postgis-users] Size of a multipolygon
Hey Ben, How goes it? Does http://postgis.refractions.net/documentation/manual-1.5/ST_NumGeometries.html do what you want? & FYI, I was interested in this post, as a PL/R user it may interest you as well? http://www.spatialdbadvisor.com/postgis_tips_tricks/290/r-based-delaunay-triangulation-function-for-postgis-using-the-deldir-package Cheers, Brent --- On Wed, 5/2/12, Ben Madin wrote: From: Ben Madin Subject: [postgis-users] Size of a multipolygon To: "PostGIS Users Discussion" Date: Wednesday, May 2, 2012, 3:26 PM Hello all, I'm sure the answer is simple, but I'm lost on what to search on - I need to quickly search through several thousand multi polygons for any which have more than one part making them up. What is the best way to do this…? (I've tried array_length(), but don't seem to be able to feed it the right part. I can't believe I can't find a function that does it… or am I looking at dumping the multi polygons into a new table and counting the number of lines for each one... cheers Ben ___ 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
Re: [postgis-users] Size of a multipolygon
http://www.postgis.org/documentation/manual-1.5/ST_NumGeometries.html On 5/1/2012 11:26 PM, Ben Madin wrote: Hello all, I'm sure the answer is simple, but I'm lost on what to search on - I need to quickly search through several thousand multi polygons for any which have more than one part making them up. What is the best way to do this…? (I've tried array_length(), but don't seem to be able to feed it the right part. I can't believe I can't find a function that does it… or am I looking at dumping the multi polygons into a new table and counting the number of lines for each one... cheers Ben ___ 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
[postgis-users] Size of a multipolygon
Hello all, I'm sure the answer is simple, but I'm lost on what to search on - I need to quickly search through several thousand multi polygons for any which have more than one part making them up. What is the best way to do this…? (I've tried array_length(), but don't seem to be able to feed it the right part. I can't believe I can't find a function that does it… or am I looking at dumping the multi polygons into a new table and counting the number of lines for each one... cheers Ben ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
