Hi, I will a chance trying to use the ST_Node. A.
Il mar 3 set 2019, 19:18 Martin Davis <[email protected]> ha scritto: > Have you tried using ST_Split passing each input line and for the second > argument a MultiLineString comprised of all lines that it might intersect > (obtained via BBOX or ST_Intersects query)? It seems like that should not > create any duplicate linework from the input line. > > As far as I know there's no other way to do this using current PostGIS > functions. It's an interesting requirement - it sounds like essentially > you want to node one layer against another. There's actually the machinery > to do this internally in PostGIS/GEOS, but it's never come up as a > requirement before, so has not been exposed as a function. > > What is your use case? > > On Tue, Sep 3, 2019 at 9:48 AM <[email protected]> wrote: > >> If I split lines with another line layer, I will get a lot of duplicaded >> line segments since the lines could be intersected several times. It is not >> possible to use update on the table when splitting one geomety to two. >> I think it must be possible, but I’m not that skilled in SQL and I’ve not >> found any examples on the net. >> >> >> _______________________________________________ > postgis-users mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/postgis-users
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