5/4/16 18 postgis topology will replace postgis simplefeature
TRANSCRIPT
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5/4/16 18Postgis Topology will replace Postgis SimpleFeature
Closed LineString where it is data
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5/4/16 19Postgis Topology will replace Postgis SimpleFeature
Closed linestring where no data
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On this layer : Postgis Topology → 5 points
: Postgis Simple Feature → 333105 (333100 duplicates) points
5/4/16 20Postgis Topology will replace Postgis SimpleFeature
Create s map with full coverage
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Use Postgis Topology for line layers ?Intersecting nodes
Shared lines
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5/4/16 22Postgis Topology will replace Postgis SimpleFeature
Change an exiting LineString, snap to crossing line
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5/4/16 23Postgis Topology will replace Postgis SimpleFeature
Draw a LineString, no snap to
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What about point layers and Postgis Topology ?
TopoJSON
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5/4/16 25Postgis Topology will replace Postgis SimpleFeature
Postgis Topology and points
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5/4/16 26Postgis Topology will replace Postgis SimpleFeature
So what is the end users reaction to just draw new lines ?
:-)Easy, faster, history kept, rollback changes
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5/4/16 27Postgis Topology will replace Postgis SimpleFeature
Developer perspective using SimpleFeature
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Weaknesses withSimpleFeature
● Duplication of lines
● Total replacement
● Mix of new and old points
● Bandwidth usage
5/4/16 28Postgis Topology will replace Postgis SimpleFeature
Development perspective move border when SimpleFeature
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Simple Features and drifting points
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5/4/16 30Postgis Topology will replace Postgis SimpleFeature
Drifting points
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5/4/16 31Postgis Topology will replace Postgis SimpleFeature
Drifting points
14 Km off
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Simple Features “equal”
DE-9IM : T*F**FFF*OR
II � ~IE � ~BE � ~EI � ~EB
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SimpleFeature is not using the relationalfeatures of Postgres.
Postgis Topology is using the relationalfeatures of Postgres.
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Development perspective And
Postgis Topology
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5/4/16 35Postgis Topology will replace Postgis SimpleFeature
Develop
perspective
using
Postgis
Topology
Slide from: http://strk.keybit.net/projects/postgis/Paris2011_TopologyWithPostGIS_2_0.pdf
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5/4/16 36Postgis Topology will replace Postgis SimpleFeature
ApacheTomcat
Java app
pgtopo_update_sqlPostgis Topology
GeoJSON
TopoJSON
GeoJSON
TopoJSON/Ids
System overview for the update client
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5/4/16 37Postgis Topology will replace Postgis SimpleFeature
Development GitLab, GitHub, Continues Integration
deploy_war_utv: stage: deploy script: - mvn package tomcat7:redeploy -Pkartupd01utv only: - develop deploy_war_test: stage: deploy script: - mvn package tomcat7:redeploy -Pkartupd01test only: - test
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Running inside Postgres
5/4/16 38Postgis Topology will replace Postgis SimpleFeature
pgtopo_update_sql
Postgis Topology
● pgtopo_update_sql
uses
Postgis Topology
to check and
adjust result
https://github.com/NibioOpenSource/pgtopo_update_sql
“developed with very good help from Sandro Santilli”
● Postgis Topology package handles the postgis operations
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5/4/16 39Postgis Topology will replace Postgis SimpleFeature
pgtopo_update_sql● Called from Java by using stored proc
Postgis Topology
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5/4/16 40Postgis Topology will replace Postgis SimpleFeature
pgtopo_update_sql Partly developed as a part of a map update project
● Focus have been this projects used cases ● Needs redesign, but it works for this project ● The update method need a redesign● Have lot of tests that help us
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5/4/16 41Postgis Topology will replace Postgis SimpleFeature
Development perspective move border with Postgis Topology
Only new linesfrom client
to
Server
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Postgis Topology means
- no drifting points- easier to undo
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fkey1 = fkey2Postgis Topology benefits
both end user and developer when workingon surface and line layers.
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Postgis Topology
- tested with one billion pointshttp://www.slideshare.net/laopsahl/foss4-g-topologyjuly162015
- seems to be solid and few errors
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5/4/16 45Postgis Topology will replace Postgis SimpleFeature
{"type":"Topology","objects":{"collection":{"type":"GeometryCollection","geometries":[{"type":"Polygon","properties":{"id":520},"arcs":[[-1]]}]}},"arcs":[[[9717,419],[-1126,-419],[-5070,958],[-2113,898],[-1126,2036],[422,2335],[-704,2754],[1972,1018],[2253,0],[1267,-419],[1409,-1437],[3098,-6467],[-282,-1257]]],"transform":{"scale":[0.007100710071007101,0.016701670167016704],"translate":[1088433,7800262]}}
● GeoJSON 7.6 MB
● TopoJSON 1.3 MB
● 80 % reduction
What is TopoJSON ?
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5/4/16 46Postgis Topology will replace Postgis SimpleFeature
Reduced client network bandwidth
known and fixed bandwidth
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5/4/16 47Postgis Topology will replace Postgis SimpleFeature
ST_Simplify perfect works best Postgis Topology
7990316 bytes 149400 byte (98 % less)
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5/4/16 48Postgis Topology will replace Postgis SimpleFeature
ST_Simplify gives you a good overview with less points
7990316 bytes 149400 byte (98 % less)
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5/4/16 49Postgis Topology will replace Postgis SimpleFeature
ST_Simplify and Simple Feature Using Topology
common border will not match. No problem
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5/4/16 50Postgis Topology will replace Postgis SimpleFeature
ST_Simplify and line layers with Topolgy
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GeoServer , MapServer and Postgis Topology
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5/4/16 52Postgis Topology will replace Postgis SimpleFeature
So what is the end developer reaction Using Postgis Topology ?:-)
Postgis Topology fits new data in to current map.(no id problem, no data lost, no duplication,less data,
faster development time)
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IF “YOU NEED SIMPLE USER INTERFACE FOR MAPS UPDATE” AND“MAPS OF HIGH QUALITY”
THENUSE POSTGIS TOPOLOGY
ELSEUSE WHATEVER YOU LIKE
END IF;
Hopefully at next FOSS4G Postgis Topology will be a main themewith workshops many talks.
Thanks for your attention [email protected]