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GeoPackage, Context and POI (and a sprinkle of GeoJSON)

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An overview of new open geodata formats from OGC, including GeoPackage, OWS Context and Points of Interest (POI).

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GeoPackage, Context and POI (and a sprinkle of GeoJSON)

  1. 1. ® ® copyright © 2014 Open Geospatial Consortium GeoPackage, Context and POI, oh my! (and a sprinkle of GeoJSON) new universal geodata formats Raj Singh, PhD Open Geospatial Consortium rsingh@myogc.org
  2. 2. OGC ® copyright © 2014 Open Geospatial Consortium Why this presentation? • Good time to survey the field of generic formats • Great new options for sharing geodata – GeoPackage: great balance of simplicity and performance – POI: strong focus on hyperlinks/web connectedness – GeoJSON: only JSON game in town • So let’s get started…
  3. 3. OGC ® copyright © 2014 Open Geospatial Consortium GEOPACKAGE
  4. 4. OGC ® copyright © 2014 Open Geospatial Consortium Why GeoPackage? Shapefiles, as a format, are dinosaurs web services don’t work without internet access internet sucks power from a mobile device
  5. 5. OGC ® copyright © 2014 Open Geospatial Consortium Overview • A GeoPackage is a platform-independent SQLite database file • A GeoPackage may contain – Data in any geographic or projected CRS using any Datum – Vector Feature User Data Tables • GP BLOB Geometry Binary Format containing WKB Geometries • Linear 2D Geometries with optional elevation and measure values – Tile Matrix Pyramid User Data Tables • PNG and JPEG Tiles • Zoom times two (adjacent zoom level pixel sizes) • First open source implementation – https://bitbucket.org/luciad/libgpkg – A SQLite 3 extension that provides a minimal implementation – distributed under the Apache Software License version 2.0
  6. 6. OGC ® copyright © 2014 Open Geospatial Consortium GeoPackage Tables for Features • defines spatial reference systems gpkg_spatial_ref_sys • identifies user data tables gpkg_contents • ids feature geometries gpkg_geometry_columns • contain feature data user_data_feature_tables
  7. 7. OGC ® copyright © 2014 Open Geospatial Consortium GeoPackage Tables for Tiles • defines spatial reference systems gpkg_spatial_ref_sys • identifies user data tables gpkg_contents • tile pyramid envelope gpkg_tile_matrix_set • describes tile zoom levels gpkg_tile_matrix • contain tile pyramids user_data_tiles_tables
  8. 8. OGC ® copyright © 2014 Open Geospatial Consortium SQLite command line example • rajsingh$ gpkg World.gpkg SQLite version 3.8.1 2013-10-17 12:57:35 libgpkg version 0.9.7 Enter ".help" for instructions Enter SQL statements terminated with a ";" • GeoPackage> .tables gpkg_contents gpkg_tile_matrix_metadata gpkg_data_columns rtree_world_shape gpkg_extensions rtree_world_shape_node gpkg_geometry_columns rtree_world_shape_parent gpkg_metadata rtree_world_shape_rowid gpkg_metadata_reference world gpkg_spatial_ref_sys • GeoPackage> .schema world CREATE TABLE "world" ( "COUNTRY" TEXT, "CAPITAL" TEXT, "POP_1994" INT, "POP_GRW_RT" DOUBLE, "POP_MALE" INT, "POP_FEM" INT, "POP_0_14" INT, "POP_15_64" INT, "POP_65PLUS" INT, "MALE_0_14" INT, "MALE_15_64" INT, "65PLUS" INT, "FEM_0_14" INT, "FEM_15_64" INT, "FEM_65PLUS" INT, "POP_URBAN" INT, "POP_RURAL" INT, "URB_MALE" INT, "URB_FEM" INT, "RUR_MALE" INT, "RUR_FEM" INT, "ARABLE_PCT" DOUBLE, "LITERACY" DOUBLE, "RATE" DOUBLE, "RATE0" DOUBLE, "GROWTH" DOUBLE, "CONTINENT" TEXT, "_id" INTEGER PRIMARY KEY AUTOINCREMENT , "shape" GeometryCollection); • GeoPackage> select country,capital from world limit 3; Afghanistan|Kabul Albania|Tirane Algeria|Algiers
  9. 9. OGC ® copyright © 2014 Open Geospatial Consortium Luciad GeoPackage use cases OGC OWS-9 Aviation Spot reporting with location and camera picture info Access elevation data to enable visibility calculations Create and edit annotations in the field
  10. 10. OGC ® copyright © 2014 Open Geospatial Consortium OGC WEB CONTEXT
  11. 11. OGC ® copyright © 2014 Open Geospatial Consortium Sharing a map Multiple overlaid maps Borders Elevation Cloud Cover Cities
  12. 12. OGC ® copyright © 2014 Open Geospatial Consortium Sharing a map Borders Elevation Cloud Cover Cities
  13. 13. OGC ® copyright © 2014 Open Geospatial Consortium Anatomy of a Context document • A context document extends the Atom XML format (or in the future JSON). • It contains Atom <entries> which have OGC <offering>s. • Offerings are data sources. They may be either services (and particularly OGC services like WMS, WFS, WMTS and WCS) or file-based data sets, like GML, KML and PDF. • File-based data sets may be specified by reference with a URL, or included inline. • OGC service offerings contain a GetCapabilites request and a request to get data, such as GetMap, GetTiles, GetFeature, etc. • Offerings do not have to be spatial, so clients implementing Context should handle non-spatial offerings in a way other than mapping them.
  14. 14. OGC ® copyright © 2014 Open Geospatial Consortium Use Cases to date… • Common Operating Picture • Describing contents of a GeoPackage • Describing a GeoPackaging WPS request • Imagery annotation
  15. 15. OGC ® copyright © 2014 Open Geospatial Consortium POINTS OF INTEREST IN OGC
  16. 16. OGC ® copyright © 2014 Open Geospatial Consortium POI work advances on 2 fronts • Points of Interest Standards Working Group – just chartered – seeks to ratify POI data encoding standards for XML and JSON – picks up dormant W3C work – all work is public at https://github.com/opengeospatial/poi • OpenPOIs registry – an implementation of the POI draft standard – living laboratory to experiment with • linked geodata • persistent services • distributed geosynchronization
  17. 17. OGC ® copyright © 2014 Open Geospatial Consortium What is OpenPOIs? A registry of all the places in the world, and links to all of their web resources
  18. 18. OGC ® copyright © 2014 Open Geospatial Consortium What is OpenPOIs? APIs to get the information as maps, XML, JSON, or RDF http://openpois.net
  19. 19. OGC ® copyright © 2014 Open Geospatial Consortium the Open-ness in OpenPOIs • open data: only POI repositories with compatible open data policies have been indexed by OpenPOIs • open API: anyone is free to use the read API, and a write API is being built for any authenticated user to freely add information • open code: built on PostGIS, Mapserver and custom PHP.
  20. 20. OGC ® copyright © 2014 Open Geospatial Consortium the OpenPOIs database • reference implementation of the POI format • free and open, always • provides a Rosetta Stone for all POIs, any time, anywhere • includes – OpenStreetMap – NGA, USGS, GeoNames – dbPedia – China Historical GIS – Futouring • future work – freebase, governments, historians – self-service synchronization
  21. 21. OGC ® copyright © 2014 Open Geospatial Consortium Descriptive Properties • location: geography specifier • label: name • description: narrative text • category: tags, keywords, etc. • link: related items • time: when the POI exists in the world
  22. 22. OGC ® copyright © 2014 Open Geospatial Consortium Location Properties • point, line, or polygon • GML 3.3 ―compact encoding‖ -- simple! • coordinate reference system (with lat/lon default) • and/or address • and/or spatial relationship to another POI <Point> <posList>42.358 -71.06</posList> </Point> <LineString> <posList>42.358 -71.06 42.375 -71.093...</posList> </LineString> <SimplePolygon> <posList>42.358 -71.06 42.375 -71.093...</posList> </SimplePolygon>
  23. 23. OGC ® copyright © 2014 Open Geospatial Consortium Descriptive Property: category <category term="722110" scheme="http://www.census.gov/naics/2007/" type="text/html" href="http://www.census.gov/econ/industry/def/d722110.htm">Full-service restaurants</category> <category term="rating:food" scheme="http://www.example.com/category/ratings" href="http://www.example.com/ratings/food#extraordinary_to_perfection">27</category> <category term="cuisine" scheme="http://www.example.com/category/cuisines" href="http://www.example.com/ratings/cuisines">Deli</category> • category • term: the unique identifier – aka tag (mandatory) • scheme: URI identifier for the term’s definition. may be resolvable (optional) • value: human-readable description (optional) • href: URL to full definition. always resolvable (optional) • type: MIME type of the href (optional) • XML examples:
  24. 24. OGC ® copyright © 2014 Open Geospatial Consortium Descriptive Property: link • link • term: relationship of link to the POI (mandatory) • href: URL for linked content (mandatory) • type: MIME type of href (mandatory) • value: human-readable description (optional) • author: basic attribution (optional) • XML examples: <link term="related" href="http://en.wikipedia.org/wiki/Faneuil_Hall" type="text/html"/> <link term="related" href="http://www.cityofboston.gov/freedomtrail/faneuilhall.asp" type="text/html"/> <link term="related" href="http://www.thefreedomtrail.org/visitor/faneuil-hall.html" type="text/html"/> <link term="related" href="http://www.faneuilhallmarketplace.com/" type="text/html"/> <link term="image‖ href="http://www.cityofboston.gov/Images_Documents/Bright_Fan_Hall_tcm3-2661.gif" type="image/gif"/> <link term="related" href="http://hdl.loc.gov/loc.award/mhsalad.130006"> <value>Faneuil Hall, exterior: perspective view, Boston, MA</value> <author term="LOC" href="http://www.loc.gov" type="text/plain"> <value>Library of Congress</value> </author> </link>
  25. 25. OGC ® copyright © 2014 Open Geospatial Consortium Data Management Properties (metadata) • id: unique identifier for the POI in the publisher’s system • created/updated/deleted: applies to the POI record (not the actual place in the world—time property covers that) • license: use restrictions, e.g. copyright
  26. 26. OGC ® copyright © 2014 Open Geospatial Consortium Basic Example: City of Boston, MA USA <poi id="http://www.rajsingh.org/pois/45343489" created="2004-01-22T09:38:21-05:00‖> <author href="http://www.rajsingh.org/me.rdf" type="application/rdf+xml"/> <license href="http://creativecommons.org/licenses/by/3.0/" type="text/html" term="CC BY 3.0"/> <label term=‖primary‖>Boston</label> <description updated="2011-10-21T22:10:00+12:00"> <value>Boston is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region.</value> <author id="http://en.wikipedia.org" href="http://en.wikipedia.org/wiki/Boston" type="text/plain"> <value>Wikipedia</value> </author> </description> <category term="city" scheme="http://www.usgs.gov/placetypes"type="text/html‖> <value>seat of a first-order administrative division</value> </category> <time term="start" type="text/datetime‖>16300917</time> <link term="canonical" href="http://www.rajsingh.org/pois/45343489.xml" scheme="http://www.iana.org/assignments/link-relations/link-relations.xml" type="text/xml"/> <link term="related" href="http://en.wikipedia.org/wiki/Boston" type="text/html" scheme="http://www.iana.org/assignments/link-relations/link-relations.xml"/> <link term=‖map" href="http://www.geonames.org/maps/google_42.358_-71.06.html" type="text/html" scheme="http://www.iana.org/assignments/link-relations/link-relations.xml"/> <location> <point term="centroid"> <Point srsName="http://www.opengis.net/def/crs/EPSG/0/4326"> <posList>42.358 -71.06</posList> </Point> </point> </location> </poi>
  27. 27. OGC ® copyright © 2014 Open Geospatial Consortium OpenPOIs API query by… example… ID http://openpois.net/poiquery.php?id=f0aa9f2f-c091-4dc2-9282-3a5dbbec8314 RESTful ID http://openpois.net/pois/f0aa9f2f-c091-4dc2-9282-3a5dbbec8314 radius/point http://openpois.net/poiquery.php?lat=42.349433712876&lon=- 71.040894451933&maxfeatures=9&format=application/xml bounding box http://openpois.net/poiquery.php?bbox=-71.10,42.35,- 71.00,42.45&maxfeatures=20&format=application/json Time and area http://openpois.net/poiquery.php?lat=25.959&lon=119.519&maxfeatures=1&format=xml&ra dius=1000&start=944 WFS http://openpois.net/openpoiwfs?request=GetCapabilities&service=WFS&version=1.1.0 http://openpois.net/api.php
  28. 28. OGC ® copyright © 2014 Open Geospatial Consortium impacts • more geospatial open data • domains that benefit from an open POI db – disaster management – public health – resource management – climate science • Better geospatial standards in – "RESTful" APIs – RDF, linked data and the Semantic Web
  29. 29. OGC ® copyright © 2014 Open Geospatial Consortium What should you do with the POI format? 1. have unique IDs for all your POIs 2. provide a public URL: • to get at every POI in W3C POI format • at least an ID and name please 3. adopt the link part of the data model • to maintain references to related POIs • add links to that public POI URL 4. be part of OpenPOI DB • work with me to link and sync to your POIs!
  30. 30. OGC ® copyright © 2014 Open Geospatial Consortium GEOJSON
  31. 31. OGC ® copyright © 2014 Open Geospatial Consortium Why GeoJSON? • only well-defined generic JSON model for geodata • a lot like GML Simple Features • Not and OGC standard, but strong OGC member interest • lots of uptake
  32. 32. OGC ® copyright © 2014 Open Geospatial Consortium GeoJSON example { "type":"Feature", "properties": { "id":"aabbaa", "name":"Ark" }, "geometry": { "type":"Polygon", "coordinates":[ [ [76.078122854233,30.96094250679],[41.624997854233,34.47656750679],[52.874997854233,33.07031750679], [63.421872854233,40.10156750679],[76.078122854233,30.96094250679] ] ] }, "crs": { "type":"name", "properties": { "name":"urn:ogc:def:crs:OGC:1.3:CRS84" } } }
  33. 33. OGC ® copyright © 2014 Open Geospatial Consortium Where is GeoJSON in OGC? • being ―murmered about‖ • tried out as a lightweight exchange format in Testbed 10 geosynchronization experiment
  34. 34. OGC ® copyright © 2014 Open Geospatial Consortium References & Contacts • GeoPackage – http://geopackage.org • OWS Context – https://github.com/opengeospatial/owc-swg (private for now) – http://owscontext.org (coming soon) • POIs – OpenPOIs Repository http://openpois.net – OGC POI Standards Working Group: http://www.opengeospatial.org/projects/groups/poiswg • GeoJSON – http://www.geojson.org/geojson-spec.html

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