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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks, Nicolas!<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Från:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> postgis-users [mailto:postgis-users-bounces@lists.osgeo.org]
<b>För </b>Nicolas Ribot<br>
<b>Skickat:</b> den 20 augusti 2019 09:21<br>
<b>Till:</b> PostGIS Users Discussion<br>
<b>Ämne:</b> Re: [postgis-users] splitting linestrings with a polygon<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Keep the geometry column as multilinestring, as resulting splitting can produce such objects, but add a st_multi after the intersection, on the update clause:<o:p></o:p></p>
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<p class="MsoNormal">... <span lang="EN-US">SET the_geom = st_multi(ST_Intersection(b.the_geom, p.the_geom))</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="EN-US">It will force geometries to be multi, even if it only contains one object.</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">You can also extract the linear part of the intersection (as it can returns point, line, or combination of both):
</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">... SET the_geom = st_multi(st_collectionExtract(ST_Intersection(b.the_geom, p.the_geom), 2))</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Nicolas</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Tue, 20 Aug 2019 at 09:09, <<a href="mailto:paul.malm@lfv.se">paul.malm@lfv.se</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi, I have a problem with MultiLinestrings/Linestrings.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I have one layer with Linestrings which I would like to split in the intersections of a polygon (MultiPolygon) in a polygon layer.
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I tried this:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">UPDATE public."linelayer" b
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> SET the_geom = ST_Intersection(b.the_geom, p.the_geom)
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> FROM public."polygonlayer" p
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> WHERE ST_Intersects(b.the_geom, p.the_geom)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I’m getting this error:</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white"> ERROR: Geometry type (MultiLineString)
does not match column type (LineString) SQL state: 22023</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white">Then I tried to make the Linsestrings to MultiLinestrings, before splitting the lines:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">ALTER TABLE public."linelayer" ALTER COLUMN "the_geom" TYPE geometry(MultiLinestring,"32633") USING ST_Multi("the_geom")</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">And tried to split the lines again with the first expression, but gets this opposite error instead:
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white">ERROR: FEL: Geometry type (LineString) does not match column type (MultiLineString)
SQL state: 22023</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white">What is it that I missed with MultiLinestring/Linestring?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white">What the heck can I do, seems like “Moment 22”?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white">Kind regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#222222;background:white">Paul</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
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