Open geo data - technical issue

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short introduction to open geo data.
Technical issues and overview to the openstreetmap potentiality

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Open geo data - technical issue

  1. 1. Open Geo DataSome technical aspects Maurizio Napolitano napo@fbk.eu
  2. 2. The gis wikification paper here http://tinyurl.com/gis-jolie
  3. 3. Spatial is Special? NO! YES! ● Data are data ● Maps are the power ● The Geographical Information ● A map is a complex Systems are very database but well defined simple to understandSpatial is Indeed Special…but GIS Software Skills will Soon be Obsolete http://justinholman.com/2012/03/20/spatial-is-indeed-special/
  4. 4. The GIS recipe● Projections● Data models● Analysis● Rendering
  5. 5. Projectionssource: http://xkcd.com/977/
  6. 6. Ex. Cilindric projection (X,Y)
  7. 7. Datum geoid Ex. World Geodetic System 84http://www.gisetelerilevamento.com/2010/04/superfici-di-riferimento-e-coordinate/
  8. 8. Universal Traverse Mercatorsource: USGS
  9. 9. UTM Zonehttp://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg
  10. 10. The most used in web devel.● EPSG:4326 - WGS84 – Degree (lat/long) – WGS84● EPSG:900913 – Google Mercator – Meters – WGS84 – World without polos ● Digit version of the word GOOGLE
  11. 11. EPSG?ex European Petroleum Survey Group http://www.epsg.org/
  12. 12. Resources http://spatialreference.org http://trac.osgeo.org/proj/● 4362 EPSG references Cartographic Projections library● 447 ESRI references● 2380 IAU2000 references
  13. 13. Data ModelsDiscrete Data Continuous DataVectors with Matrixattributes Ex.Points Digital Elevations ModelsLines Solar Power cellsPolygons Orthophotos GEOREFENCED
  14. 14. Example Raster http://en.wikipedia.org/wiki/Esri_grid
  15. 15. DTM gray
  16. 16. DTM elevation
  17. 17. Example Vector
  18. 18. Points
  19. 19. Lines
  20. 20. Overlay
  21. 21. Query
  22. 22. Network Analysis
  23. 23. Graphs
  24. 24. Solar radiation
  25. 25. Precipitation
  26. 26. Nice … but Open Data? Yes! Licenses & Formats & Protocols
  27. 27. Our friendsOnly if he speaks also about open data
  28. 28. Open Formats● Vectors – ESRI Shapefile – GML – GeoJSON – KML● Raster – Ascii Grid – GeoTiff –
  29. 29. Eg. ESRI Shape● Standard de facto● 3 (4) files with the same name and different extension filename.shp → geometry filename.shx → index filename.dbf → table (filename.prj → projection)
  30. 30. Geo Web Services● WMS – Web Map Service● WFS – Web Feature Service● WCS – Web Coverage Service● WPS – Web Processing Service● TMS – Tile Map Service● CSW – Catalog Service for the Web
  31. 31. TMS
  32. 32. An Example ofOpen Geo Data Service http://data.wien.gv.at/
  33. 33. Clients
  34. 34. Where are the data? http://earthexplorer.usgs.gov/ http://publicdata.eu… and more more ...
  35. 35. OpenStreetMap Open Community Databorn in 2004 ~ … but for the maps ...
  36. 36. HOW?
  37. 37. WHO People and vehicles of OpenStreetMap(slide by Niccolo Rigacci – http://www.rigacci.org - CC-BY-SA-NC)
  38. 38. Tools
  39. 39. Geometries and attributeshttp://wiki.openstreetmap.org/wiki/Map_Features
  40. 40. Collect the data
  41. 41. Trace the data
  42. 42. with the walking papershttp://walkingpapers.org/print.php?id=d6rzwc3d
  43. 43. Improve the data collected
  44. 44. help thematic maps http://wheelmap.org
  45. 45. Official http://www.openstreetmap.org/?lat=44.493944&lon=11.343526&zoom=18&layers=A
  46. 46. http://wiki.openstreetmap.org/wiki/List_of_OSM_based_Services
  47. 47. Giro dItalia (1/2)Tappa “Herning-Herning” –http://www.gazzetta.it/Speciali/Giroditalia/2012/it/tappa.shtml?t=01&lang=it
  48. 48. Giro dItalia (2/2)
  49. 49. Maurizio Napolitanonapo@fbk.euBlog: http://de.straba.usTwitter napoSlides http://www.slideshare.net/napo Thanks!!!

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