Hi, Thank you for the answer. However, I don't get the right result. For example, when there is a line that is long 500 meters and it crosses 5 polygons (on each of them maybe just a meter or few meters, except one where lies a majority of the line), I get the full length of the lines for corresponding polygons - i.e. as every polygon that is crossed is crossed by the total line length. What I want to get is the actual length of the part of the line that crosses every specific polygon.
TIA, Matej 2012/7/3 Denis Rouzaud <denis.rouz...@gmail.com>: > Hi, > > You can use something like > > SELECT areas.id, SUM( ST_Length( lines.geometry) ) FROM lines,areas WHERE > ST_Intersects(lines.geometry,areas.geometry) GROUP BY areas.id ; > > Greetings, > > Denis > > > On 07/03/2012 01:36 PM, Matej Mailing wrote: >> >> Hi all, >> >> We have a layer that contains polygons and another that contains lines >> that lie on them. Parts of the lines are laying "inside" the polygons >> and I would like to get a sum of all the lengths of lines that lie on >> the polygons. What is the easiest way to achieve this? >> >> TIA, >> Matej >> _______________________________________________ >> 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