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5/4/16 18 Postgis Topology will replace Postgis SimpleFeature Closed LineString where it is data

5/4/16 18 Postgis Topology will replace Postgis SimpleFeature

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  • 5/4/16 18Postgis Topology will replace Postgis SimpleFeature

    Closed LineString where it is data

  • 5/4/16 19Postgis Topology will replace Postgis SimpleFeature

    Closed linestring where no data

  • 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

  • Use Postgis Topology for line layers ?Intersecting nodes

    Shared lines

  • 5/4/16 22Postgis Topology will replace Postgis SimpleFeature

    Change an exiting LineString, snap to crossing line

  • 5/4/16 23Postgis Topology will replace Postgis SimpleFeature

    Draw a LineString, no snap to

  • What about point layers and Postgis Topology ?

    TopoJSON

  • 5/4/16 25Postgis Topology will replace Postgis SimpleFeature

    Postgis Topology and points

  • 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

  • 5/4/16 27Postgis Topology will replace Postgis SimpleFeature

    Developer perspective using SimpleFeature

  • 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

  • Simple Features and drifting points

  • 5/4/16 30Postgis Topology will replace Postgis SimpleFeature

    Drifting points

  • 5/4/16 31Postgis Topology will replace Postgis SimpleFeature

    Drifting points

    14 Km off

  • Simple Features equal

    DE-9IM : T*F**FFF*OR

    II ~IE ~BE ~EI ~EB

  • SimpleFeature is not using the relationalfeatures of Postgres.

    Postgis Topology is using the relationalfeatures of Postgres.

  • Development perspective And

    Postgis Topology

  • 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

    http://strk.keybit.net/projects/postgis/Paris2011_TopologyWithPostGIS_2_0.pdf

  • 5/4/16 36Postgis Topology will replace Postgis SimpleFeature

    ApacheTomcat

    Java apppgtopo_update_sqlPostgis Topology

    GeoJSON

    TopoJSON

    GeoJSON

    TopoJSON/Ids

    System overview for the update client

  • 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

  • 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

    https://github.com/NibioOpenSource/pgtopo_update_sql

  • 5/4/16 39Postgis Topology will replace Postgis SimpleFeature

    pgtopo_update_sql Called from Java by using stored proc

    Postgis Topology

  • 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

  • 5/4/16 41Postgis Topology will replace Postgis SimpleFeature

    Development perspective move border with Postgis Topology

    Only new linesfrom client

    to

    Server

  • Postgis Topology means

    - no drifting points- easier to undo

  • fkey1 = fkey2Postgis Topology benefits

    both end user and developer when workingon surface and line layers.

  • Postgis Topology

    - tested with one billion pointshttp://www.slideshare.net/laopsahl/foss4-g-topologyjuly162015

    - seems to be solid and few errors

    http://www.slideshare.net/laopsahl/foss4-g-topologyjuly162015

  • 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 ?

  • 5/4/16 46Postgis Topology will replace Postgis SimpleFeature

    Reduced client network bandwidth

    known and fixed bandwidth

  • 5/4/16 47Postgis Topology will replace Postgis SimpleFeature

    ST_Simplify perfect works best Postgis Topology

    7990316 bytes 149400 byte (98 % less)

  • 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)

  • 5/4/16 49Postgis Topology will replace Postgis SimpleFeature

    ST_Simplify and Simple Feature Using Topology

    common border will not match. No problem

  • 5/4/16 50Postgis Topology will replace Postgis SimpleFeature

    ST_Simplify and line layers with Topolgy

  • GeoServer , MapServer and Postgis Topology

  • 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)

  • IF YOU NEED SIMPLE USER INTERFACE FOR MAPS UPDATE ANDMAPS 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]

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