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Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
Apps4 finland   shapefiles, wgs84 and other odd terms
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Apps4 finland shapefiles, wgs84 and other odd terms

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  • 1. Shapefiles, WGS84 and other odd terms Workshop on Open Location Data Pekka Sarkola
  • 2. 21/09/2011 2 HistoryFinland first time on the map by Jacob Ziegler (1532)
  • 3. 21/09/2011 3File formats
  • 4. 21/09/2011 4 Combination Roughly 2000 – 3000 coordinate systems Around 300 commonly used GIS file formats
  • 5. 21/09/2011 5 Coordinate systems Polar Coordinate systemCartesian coordinate system Geographic coordinate system
  • 6. 21/09/2011 6 Coordinate systems – no problems... What is origin? What is direction? What is unit of measurement? You have choices:  Thousands of different coordinate systems  Good ones and bad ones  Old vs new  Local vs global
  • 7. 21/09/2011 7 Geographic Coordinate Systems Latitude (leveys), longitude (pituus) and ellipsoid height Common datums / geodetic systems  WGS 84, 72, 64, and 60  ETRS89  NAD83 / NAD27 : USA  OSGB36: GB  ED50: European Datum  Hayford International 1924: base of
  • 8. 21/09/2011 8Demo
  • 9. 21/09/2011 9 Map projections: Basic challenge Your paper map and your computer screen is flat World is not!
  • 10. 21/09/2011 10 Map projections Always distortion of  Area  Shape  Direction  Bearing  Distance  Scale
  • 11. 21/09/2011 11Universal Transverse Mercator (UTM)
  • 12. 21/09/2011 12 Finnish Coordinate Systems Kartastokoordinaattijärjestelmä (KKJ)  Old one, from 1970’s  Map projection:  Transverse mercator, 6 zones EUREF-FIN  New, based on ETRS89  Several map projections  ETRS-TM35FIN  ETRS-TM21, 27, 33  ETRS-GK19-31
  • 13. 21/09/2011 13Web mercator
  • 14. 21/09/2011 14
  • 15. 21/09/2011 15 Georeferencing, geotagging, Georeferencing  ”To georeference something means to define its existence in physical space”, Wikipedia  Especially for aerial and satellite imagery Geotagging  Add coordinates to single item, like picture taken with mobile phone
  • 16. 21/09/2011 16 Geocoding• Transform address / place name to coordinates D2.8.I.5 INSPIRE Data Specification on Addresses – Guidelines
  • 17. 21/09/2011 17Questions?

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