Simon, Yes, I have solved the problem by merging left linestrings and also the right linestring aswell.
kind regards, surya ________________________________ From: Simon Greener <[email protected]> To: PostGIS Users Discussion <[email protected]> Sent: Thu, October 15, 2009 4:46:40 PM Subject: Re: [postgis-users] polygon minimum width Sury, Sorry for the delay: you must have solved this by now. My "test case" only had two linestrings as you didn't give us any real data to play with. Looking at your 5 row data result below seems to indicate that your river covers more than two rows. So, question to you, what is stored in each row? Which rows have the left data and which the right? And if there are null geometries then you should do this: select row_number() over (order by the_geom) as rin, the_geom from River r where r.Name = 'Barito' and r.the_geom is not null; regards Simon On Wed, 14 Oct 2009 20:43:45 +1100, Surya Tarigan <[email protected]> wrote: > Dear Simon, > > the previous SQL ((select row_number() over (order by the_geom) as rin) gave > good result, meanwhile the second SQL ( (select ctid as rin, the_geom) still > return '0' min_width. But I still need to check my river polyline, because > both min and max give exactly the same result, which it should not.. > > After I run : > > select row_number() over (order by the_geom) as rin, the_geom > from River r > where r.Name = 'Barito'; > it gave result something like : > rin, the_geom > 1; -----(empty)--- > 2;-----(empty)--- > 3;010500000000........ > 4;010500000000.............. > 5;010500000......... > could it be caused by empty the_geom in rin 1 and 2? > kind regards, > sury > > > > -- SpatialDB Advice and Design, Solutions Architecture and Programming, Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, FME, Radius Topology and Studio Specialist. 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia. Website: www.spatialdbadvisor.com Email: [email protected] Voice: +61 362 396397 Mobile: +61 418 396391 Skype: sggreener Longitude: 147.20515 (147° 12' 18" E) Latitude: -43.01530 (43° 00' 55" S) GeoHash: r22em9r98wg NAC:W80CK 7SWP3 _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
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