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

1. Open Geo Data
Some technical aspects
Maurizio Napolitano napo@fbk.eu

2. The gis wikification
paper here http://tinyurl.com/gis-jolie

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
understand
Spatial is Indeed Special…but GIS Software Skills will Soon be Obsolete
http://justinholman.com/2012/03/20/spatial-is-indeed-special/

4. The GIS recipe
●
Projections
●
Data models
●
Analysis
●
Rendering

5. Projections
source: http://xkcd.com/977/

6. Ex. Cilindric projection
(X,Y)

7. Datum
geoid
Ex.
World Geodetic System 84
http://www.gisetelerilevamento.com/2010/04/superfici-di-riferimento-e-coordinate/

8. Universal Traverse Mercator
source: USGS

9. UTM Zone
http://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg

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. EPSG?
ex European Petroleum Survey Group
http://www.epsg.org/

12. Resources
http://spatialreference.org http://trac.osgeo.org/proj/
●
4362 EPSG references Cartographic Projections
library
●
447 ESRI references
●
2380 IAU2000 references

13. Data Models
Discrete Data Continuous Data
Vectors with Matrix
attributes Ex.
Points Digital Elevations Models
Lines Solar Power cells
Polygons Orthophotos
GEOREFENCED

14. Example Raster
http://en.wikipedia.org/wiki/Esri_grid

15. DTM gray

16. DTM elevation

17. Example Vector

18. Points

19. Lines

20. Overlay

21. Query

22. Network Analysis

23. Graphs

24. Solar radiation

25. Precipitation

26. Nice … but Open Data?
Yes!
Licenses & Formats & Protocols

27. Our friends
Only if he speaks also about open data

28. Open Formats
●
Vectors
– ESRI Shapefile
– GML
– GeoJSON
– KML
●
Raster
– Ascii Grid
– GeoTiff
–

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. 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. TMS

32. An Example of
Open Geo Data
Service
http://data.wien.gv.at/

33. Clients

34. Where are the data?
http://earthexplorer.usgs.gov/
http://publicdata.eu
… and more more ...

35. OpenStreetMap
Open Community Data
born in 2004 ~ … but for the maps ...

36. HOW?

38. WHO
People and vehicles of OpenStreetMap
(slide by Niccolo Rigacci – http://www.rigacci.org - CC-BY-SA-NC)

39. Tools

41. Geometries and attributes
http://wiki.openstreetmap.org/wiki/Map_Features

42. Collect the data

43. Trace the data

44. with the walking papers
http://walkingpapers.org/print.php?id=d6rzwc3d

45. Improve the data collected

46. help thematic maps
http://wheelmap.org

48. Official
http://www.openstreetmap.org/?lat=44.493944&lon=11.343526&zoom=18&layers=A

51. http://wiki.openstreetmap.org/wiki/List_of_OSM_based_Services

52. Giro d'Italia
(1/2)
Tappa “Herning-Herning” –
http://www.gazzetta.it/Speciali/Giroditalia/2012/it/tappa.shtml?t=01&lang=it

53. Giro d'Italia (2/2)

54. Maurizio Napolitano
napo@fbk.eu
Blog:
http://de.straba.us
Twitter
napo
Slides
http://www.slideshare.net/napo
Thanks!!!