Dear list,
I would like to use the ST_Split function to split polygons from one
table with all intersecting lines from another table. Unfortunately, I
get the following error:
ERROR: Splitting a Polygon by a MultiLineString is unsupported
SQL Status:XX000
This is my query:
select betr_id, (cut).path[1], (cut).geom from (select betr_id,
st_dump(st_split) as cut from (select a.betr_id, ST_Split(a.geom,
st_union(b.geom)) from p_sam.nihb_2013_convex_hull_betr a left join
p_sam.ni_dlm13_aaa_gew_sie_ver_l b on st_intersects(a.geom, b.geom)
group by a.betr_id, a.geom) sel1) sel2;
The Manual contains the following info regarding this problem:
"The function supports splitting a line by (multi)point, (multi)line or
(multi)polygon boundary, a (multi)polygon by line*.*"
This might mean that I would be able to split a line by
multilinestrings, but a polygon only by single linestrings - is that
correct? Does anyone has a suggestion how I could work around this
problem (aside from looping the ST_Split with some function, DO block or
pgScript after selecting all intersecting linestrings per polygon)?
Thanks a lot for any helpful suggestions!
Regards,
Birgit
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