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List: postgis-users
Subject: [postgis-users] removing objects and at the same time updating others
From: <paul.malm () lfv ! se>
Date: 2020-06-23 6:07:14
Message-ID: b0c8bc31c761494da5e331bde04c530c () lfv ! se
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Hi list,
I have a problem with adjacent polygons when converting them to lines,
as I would like to only have one line in the boundaries between the former polygons. \
Now it could be up to 5. I've been thinking of:
1. Creating a thin buffer around the line strings with the featureId from the \
line strings as a new layer.
2. Then I should break the line strings to line segments into a new layer with \
where the line segments gets the featureId from the line string.
3. Create a column (edited) in the new line-segment layer with a default value \
of 0
4. Then delete from the line segments layer all segments that are within the \
buffer, but not the line segments that have the same featureId as the current buffer \
and edited value must be 0 to be deleted.
5. The line segments that are not deleted in the current buffer shall be \
updated (edited = 1).
6. Do step 4 and 5 until the all objects in the buffered layer is executed.
I've come this far:
DELETE FROM "LineSegments" USING buffered as h WHERE
ST_Contains(h.the_geom, " LineSegments".the_geom) AND
"LineSegments".edited = 0 AND
NOT h.fid=" LineSegments".fid;
But how can I set the edited vale = 1 on the objects (line segments) that are not \
deleted (in the current buffer) at the same time so it won't be deleted in the next \
run with an adjacent buffer? Kind regards,
Paul
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<p class="MsoNormal"><span lang="EN-US">Hi list,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have a problem with adjacent polygons when \
converting them to lines,<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">as I would like to only have one line in the boundaries between the \
former polygons. Now it could be up to 5.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US">I’ve been thinking \
of:<o:p></o:p></span></p> <p class="MsoListParagraph" \
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span \
lang="EN-US"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New \
Roman""> \
</span></span></span><![endif]><span lang="EN-US">Creating a thin buffer around the \
line strings with the featureId from the line strings as a new \
layer.<o:p></o:p></span></p> <p class="MsoListParagraph" \
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span \
lang="EN-US"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New \
Roman""> \
</span></span></span><![endif]><span lang="EN-US">Then I should break the line \
strings to line segments into a new layer with where the line segments gets the \
featureId from the line string.<o:p></o:p></span></p> <p class="MsoListParagraph" \
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span \
lang="EN-US"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New \
Roman""> \
</span></span></span><![endif]><span lang="EN-US">Create a column (edited) in the new \
line-segment layer with a default value of 0<o:p></o:p></span></p> <p \
class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if \
!supportLists]><span lang="EN-US"><span style="mso-list:Ignore">4.<span \
style="font:7.0pt "Times New Roman""> \
</span></span></span><![endif]><span lang="EN-US">Then delete from the line segments \
layer all segments that are within the buffer, but not the line segments that have \
the same featureId as the current buffer and edited value must be 0 to be \
deleted.<o:p></o:p></span></p> <p class="MsoListParagraph" \
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span \
lang="EN-US"><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New \
Roman""> \
</span></span></span><![endif]><span lang="EN-US">The line segments that are not \
deleted in the current buffer shall be updated (edited = 1).<o:p></o:p></span></p> <p \
class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if \
!supportLists]><span lang="EN-US"><span style="mso-list:Ignore">6.<span \
style="font:7.0pt "Times New Roman""> \
</span></span></span><![endif]><span lang="EN-US">Do step 4 and 5 until the all \
objects in the buffered layer is executed.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US">I’ve come this far:<o:p></o:p></span></p> \
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-US" \
style="color:black">DELETE FROM "LineSegments" USING buffered as h \
WHERE</span><span lang="EN-US"><o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="color:black">ST_Contains(h.the_geom, " LineSegments".the_geom) \
AND</span><span lang="EN-US"><o:p></o:p></span></p> <p class="MsoNormal" \
style="text-autospace:none"><span lang="EN-US" \
style="color:black">"LineSegments".edited = 0 AND </span><span \
lang="EN-US"><o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:black">NOT h.fid="</span><span lang="EN-US"> </span><span \
lang="EN-US" style="color:black">LineSegments".fid;</span><span \
lang="EN-US"><o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="mso-fareast-language:SV">But how can I set the edited vale = 1 on the objects \
(line segments) that are not deleted (in the current buffer) at the same time so it \
won’t be deleted in the next run with an adjacent \
buffer?<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="mso-fareast-language:SV">Kind regards, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="mso-fareast-language:SV">Paul<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="font-size:9.0pt;mso-fareast-language:SV"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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