Thanks, (I am trying to get permission to send the data). I have n't tried st_Straightskeleton. Will try it....
On Mon, Aug 27, 2018 at 11:07 AM, Darafei "Komяpa" Praliaskouski < [email protected]> wrote: > Hi! > > First case sounds like ST_Snap. > > For second case, if you are not going to write an extending loop I would > try to get the polygon after buffering and then try with > ST_StraightSkeleton and ST_ApproximateMedialAxis. > > Can you share a dataset to play with? > > пн, 27 авг. 2018 г. в 19:34, Hemant Bist <[email protected]>: > >> Hi, >> Is there something already written that can help me do the following? >> >> I need to "extend" the line segments by a small amount to see if they >> can be joined. The use cases are >> 1) Joining line segments that should be joined in reality but in the data >> (linstrings) they have a small gap. >> 2) The vector lines (multiple linestrings) are dashed line representation >> of real line .e.g. representing a road by dashed line of 4mm dashes with >> gap of 1 mm between them. >> I am willing to live with error cases where some line segments are joined >> when they should not be. The output I need should be >> >> I cannot do st_buffer(st_union(st_buffer( line_geometry, epsilon)), >> -epsilon) as it turns the lines into area. But visually these areas look >> close to what I need. >> The other drawback of st_buffer is that it extends line in all >> directions, instead of extending line segments in expected directions. >> >> Currently the only possible "solution" I have in mind is to write >> something custom to extend the individual line strings and then do st_union. >> >> If there are something available in other tools like gdal, grass, I will >> be happy to look at them. Currently I don't know of any solutions in other >> tools as well. >> Thanks, >> HB >> >> >> >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/postgis-users > > -- > Darafei Praliaskouski > Support me: http://patreon.com/komzpa > > _______________________________________________ > postgis-users mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/postgis-users >
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