Overview

Project website postgis.net/workshops/postgis-intro
Project maintainers User avatar jsanz User avatar cvvergara User avatar komzpa User avatar dmateos User avatar yellow73 User avatar dkastl User avatar andischi User avatar astrid_emde User avatar jef
Translation license Creative Commons Attribution 3.0 United States
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Source code repository https://github.com/postgis/postgis-workshops.git
Repository branch master
Last remote commit Merge pull request #122 from osgeoweblate/weblate-postgis-workshop-index 9424034
Regina Obe authored 2 days ago
Last commit in Weblate Translated using Weblate (Chinese (Simplified)) bd5d823
Zuochenwei authored a month ago
Weblate repository https://weblate.osgeo.org/git/postgis-workshop/index/
File mask postgis-intro/sources/locale/*/LC_MESSAGES/topology.po
Translation file Download postgis-intro/sources/locale/de/LC_MESSAGES/topology.po
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2 weeks ago

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Strings with suggestions 1% 1 1% 1 1% 8
Untranslated strings 100% 61 100% 1,634 100% 10,450
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Topology
Topologie
2 months ago
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Resource updated

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File postgis-intro/sources/locale/de/LC_MESSAGES/topology.po was added. 2 months ago
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String updated in the repository

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We do still have gaps of empty space between neighborhoods caused by intensive simplication. Such issues can be fixed by directly editing the topology using the `Topology Editor family of functions <https://postgis.net/docs/Topology.html#Topology_Editing>`_ and/or filling in the holes and assigning those to neighborhoods.
 
2 months ago
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The result of the above is 29 neighborhoods were updated. If you rerun the border dispute queries for neighborhoods and boroughs, you'll find you have no more border disputes.
 
2 months ago
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Removing elements from Topogeometries is handled using the `TopoGeom_remElement <https://postgis.net/docs/TopoGeom_remElement.html>`_ function. So lets get on with it, removing duplicaed elements from neighborhoods with the most amount of area as follows:
 
2 months ago
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There are a number of ways we could fix this. We could go out surveying asking people what neighbhood do they think they are standing in. Alternatively we could just assign slivers of land to the neighborhood with the least amount of area or to the highest bidder.
 
2 months ago
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Because boroughs are an aggregation of neighborhoods, we can fix the borough issue by fixing the neighborhood border disputes.
 
2 months ago
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If we look at our neighborhoods, we'll see a similar story but with 44 border disputes:
 
2 months ago
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The result will be 5 rows corresponding to border disputes between Queens and Brooklyn.
 
2 months ago
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What is returned are a set of topolements. A topoelement is represented as an array of 2 integers with the first number being the id of the element, and the second, being the layer (or primitive type) of the element. PostGIS GetTopoElements returns the primitives of a topogeometry with types number 1-3 corresponding to (1: nodes, 2: edges, and 3: faces). All the topoelements for neighborhoods and boroughs are type 3, which corresponds to a topological face. We can use the `ST_GetFaceGeometry <https://postgis.net/docs/ST_GetFaceGeometry.html>`_ to get a visual representation of these shared faces as folows:
 
2 months ago
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