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26:08 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2014
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Update on new OGC Standards: GeoPackage, OWS Context & Geosync

This presentation presents an overview on new OGC standards and developer tips on how to build your own implementations from scratch or on top of existing open source libraries that implement them. We cover GeoPackage, the new SQLite-based geospatial data format; OWS Context for describing a group of related spatial data resources (e.g. for map composition); and the emerging Geosync architecture based on lessons from CouchDB.
  • Published: 2014
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
35:55 FOSS4G, Open Source Geospatial Foundation (OSGeo) English 2014
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Anchoring and PostGIS cure Post-Polygon Stress Disorder

Polygons are great to have in digital maps, much like a canvas that we can render with beautiful colours. It is common that polygon boundaries are shared by linear features (e.g., municipalities divided by a river or a road). If polygons are used as part of the base to edit, update, and integrate digital maps, we have to reconcile the geometric differences among the shared boundaries and fix topological problems in edge matching. For many years we felt blessed that commercial software tools are available to reconcile shared boundaries, and to detect and fix topological problems. However, if wrestling with polygons leaves you feeling buried in slivers, discontinuities, gaps, and overlaps, you've got Post-Polygon Stress Disorder (PPSD). PostgreSQL/PostGIS presented British Columbia Geological Survey an opportunity to identify the causes of PPSD. As a result, we have developed a geologic framework data model and implemented an anchoring mechanism in PostGIS to simplify the process of editing, updating, and integrating digital geological maps. We have dispensed with polygons and eliminated the problems from shared boundaries and edge matching.Healing to PPSD is available in this poster:http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/GeoFiles/Pages/2014-9.aspx.
  • Published: 2014
  • Publisher: FOSS4G, Open Source Geospatial Foundation (OSGeo)
  • Language: English
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