Dan, Disregard my last email except the OpenJump part. I was reading out of order. Thanks, Regina
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dane Springmeyer Sent: Monday, October 06, 2008 1:12 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] Cascaded Union Aggregate function Regina, Okay, I've finished running your fuller test query included on the wiki. Both of the variations on your cascade union timed the same, and astonishingly faster that ST_Union: SELECT ST_NPoints(upgis_cascadeunion(the_geom)) As afterpoints, Sum(ST_NPoints(the_geom)) as beforepoints FROM npsa; -- 4.05 minutes -- points before = 163612 -- points after = 1069320 SELECT ST_NPoints(ST_Union(the_geom)) As afterpoints, Sum(ST_NPoints(the_geom)) as beforepoints FROM npsa; --161.85 min -- points before = 163612 -- points after = 1069320 -- http://postgis.refractions.net/pipermail/postgis-devel/2008-August/003412.ht ml SELECT ST_NPoints(st_cascadeunion(the_geom)) As afterpoints, Sum(ST_NPoints(the_geom)) as beforepoints FROM npsa; -- 4.06 minutes -- points before = 163612 -- points after = 1069320 Dane On Oct 5, 2008, at 10:29 AM, Paragon Corporation wrote: Dane, Nice to hear. I ran on your set too, but ran thru the whole thing SELECT ST_NPoints(upgis_cascadeunion(the_geom)) As afterpoints, Sum(ST_NPoints(the_geom)) as beforepoints FROM npsa_albers Took SELECT 259329/1000.0/60 ms => 4.322 minutes N Points after = 163,612; N Points Before = 1,069,320; I was afraid to try this using the current ST_Union (you remember by chance how long your below takes with ST_Union?) I tried unioning the shape in OpenJump version that has the cascade union and it took about 5 minutes. I'll have to try that again since in all the tests I have run OpenJump has always been faster (unfortunately where I am at the moment, my PostgreSQL is running on server and OpenJump with shape locally, so that may not have been a fair test). But it seems to end up with the same number of points of 163,612. Thanks, Regina _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dane Springmeyer Sent: Sunday, October 05, 2008 12:59 PM To: PostGIS Users Discussion Subject: Re: [postgis-users] Cascaded Union Aggregate function Regina, Great, my query now works with your amended upgis function posting. So, here are my timing outputs for the dataset on watersheds I just sent a reference to: select count(*) from npsa; --3162 records select st_cascadeunion(the_geom) from npsa group by wholedrain; -- 48.39 sec select upgis_cascadeunion(the_geom) from npsa group by wholedrain; -- 50.91 sec select ST_Union(the_geom) from npsa group by wholedrain; -- 2.49 minutes select ST_Collect(the_geom) from npsa group by wholedrain; -- 10.73 seconds Next chance I get I'll take a look at the actual results. Thanks! Dane On Oct 5, 2008, at 5:53 AM, Paragon Corporation wrote: Dane, Dane, Oops sorry about that . I just posted a revised version. Can you try that out? Thanks. Also can you send me a sample of your data off list. I think the issue was I was experimenting with array_append vs. st_geom_accum and I had gotten the error you described below, but then was unable to replicate it again. It could be the detoasting affect of st_geom_accum that Mark had described was the difference between the two. Thanks, Regina -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dane Springmeyer Sent: Sunday, October 05, 2008 1:47 AM To: PostGIS Users Discussion Subject: Re: [postgis-users] Cascaded Union Aggregate function Hi Regina, Thank you so much for the wiki posting. I've been using your code from your august 12th email with great success, if not joy. What an amazing speed improvement, especially for such a critical function. This was your exact email of code I have working: http://postgis.refractions.net/pipermail/postgis-devel/2008-August/003412.ht ml I've just downloaded the new code off the wiki, but I'm getting an error of 'Unknown Geometry Type: 0'. I'll paste the whole error below in case you have an idea what might be going on. I'm running mac 10.5 with these details: postgis_version --------------------------------------- 1.3 USE_GEOS=1 USE_PROJ=1 USE_STATS=1 (1 row) -------------------------------------------------------------- PostgreSQL 8.3.3 on i386-apple-darwin9.4.0, compiled by GCC Cheers, Dane -- full error: test=# select upgis_cascadeunion(the_geom) from npsa group by wholedrain; ERROR: Unknown geometry type: 0 CONTEXT: SQL function "upgis_dump_collect_garray" statement 1 SQL statement "SELECT upgis_dump_collect_garray( array_append(ARRAY(SELECT $1 [s] As geom FROM generate_series(1, $2 ) As s WHERE NOT (s = ANY( $3 )) ), st_unite_garray(ARRAY(SELECT $1 [s] As geom FROM generate_series(1, $2 ) As s WHERE s = ANY( $3 ) ) ) ) )" PL/pgSQL function "st_collect_unite_garray" line 29 at assignment SQL statement "SELECT upgis_unitecascade_garray(ARRAY(SELECT st_collect_unite_garray( $1 [i:least(i + $2 - 1, $3 )]) As geom FROM generate_series(1, $3 , $2 ) As i), $4 + 1, $5 , false)" PL/pgSQL function "upgis_unitecascade_garray" line 48 at assignment SQL statement "SELECT upgis_dump_collect_garray( array_append(ARRAY(SELECT $1 [ $2 [s]] As geom FROM generate_series(1, array_upper( $2 ,1)) As s ), upgis_unitecascade_garray(ARRAY(SELECT $1 [s] As geom FROM generate_series(1, $3 ) As s WHERE NOT (s = ANY( $2 )) ), $4 + 1, $5 , true) ) )" PL/pgSQL function "upgis_unitecascade_garray" line 33 at assignment SQL function "upgis_unitecascade_garray_sort" statement 1 On Oct 4, 2008, at 4:53 PM, Paragon Corporation wrote: Oops sorry about that. Just realized I had ugly spaces in the link. I've changed it. Use this one http://postgis.refractions.net/support/wiki/index.php?upgis_cascadeuni on -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paragon Corporation Sent: Saturday, October 04, 2008 7:44 PM To: 'PostGIS Users Discussion' Subject: [postgis-users] Cascaded Union Aggregate function For those people who have unions to do that are slow, feel free to try out this aggregate union function. I haven't tested it enough for it to make it into 1.3.4, but have included a link to the source code in the wiki. It should work just fine on PostGIS versions 1.2.2 and above. http://postgis.refractions.net/support/wiki/index.php?PL%2FPGSQL%20Pse udo%20 Cascade%20Union%20Aggregate%20Function Let me know if you run into any problems with it. It has worked well for the samples I have used it on. Thanks, Regina _______________________________________________ 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 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 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
