Hi Dane, Yes, you are right. I got a response from PostGIS list(I didn't occur to me that I should ask this in PostGIS list. I had been using only mapnik python wrappers and shapefiles so far :-) ) What I needed is available as a sql function(ST_Simplyify) in PostGIS. I just needed to play around with tolerance a little bit.. In case its useful to anyone, I am pasting the relevant links below.
http://postgis.refractions.net/docs/ST_Simplify.html http://postgis.refractions.net/docs/ST_SimplifyPreserveTopology.html http://bostongis.org/PrinterFriendly.aspx?content_name=postgis_simplify http://old.nabble.com/simplify-a-linestring-to-n-points-td20632406.html Cheers, HB On Fri, Dec 25, 2009 at 12:23 PM, Dane Springmeyer <[email protected]>wrote: > Hemant. Interesting problem. I think you are on the right track looking > into ogr and/or PostGIS. I would try this first in PostGIS using a few SQL > scripts. > > In general I would try unioning your whole dataset and then re-splitting > the linework at the desired interval. I did something similar (though a bit > more involved) with the help of PostGIS users a while back: > > > http://www.mail-archive.com/[email protected]/msg04582.html > > Dane > > --- \o/ --- > Sent from my phone > > > On Dec 24, 2009, at 10:33 PM, Hemant Bist <[email protected]> wrote: > > This is not necessarily a Mapnik question. I am hoping someone can point >> me to the right tools. >> I have got a polyline shapefile where each segment is roughly 1 meter, >> and each polyline has roughly 200 segments. >> I want to "resample" to convert the polyline to have a segment of roughly >> 10 meter and only 20 segments. >> >> Are there any tools that can help do that, or I have to write my own >> heuristic by reading shapfile and writing back. >> I have looked at ogr2ogr and postgis briefly, but I didn't find anything >> relevant there. >> >> Happy holidays, >> HB >> >> _______________________________________________ >> Mapnik-users mailing list >> [email protected] >> https://lists.berlios.de/mailman/listinfo/mapnik-users >> >
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