Most popular mapping presentations today, ranging from clients to servers, show and discuss only maps in EPSG:3857, the popular Mercator derived projection used by OSM as well as most commercial tiles providers. There is however an interesting, exciting world of map projections out there, that are still being used in a variety of context. This presentation will introduce the advancement made in GeoTools and GeoServer to handle those use cases, where users have a worldwide data set, and need to view all or part of it in multiple projections, some of which valid in a limited area, and requiring the software to perform a proper display of it on the fly, without any preparation. We’ll discuss GeoTools/GeoServer “advanced projection handling” manages to deal with these cases, wrapping data, dealing with the poles and the dateline, cutting on the fly excess data, densifying on the fly long lines as needed to ensure a smooth reprojection, for a variety of cases, ranging from seemingly innocuous datum shifts, maps having the prime meridian over the pacific, and the various tricks to properly handle stereographic, transverse mercator, Lambert conic and other limited area projections against world wide source data sets.

1. Mapping beyond
web mercator
Ing. Andrea Aime
GeoSolutions

2. GeoSolutions
 Italian SME
 Expertise
• Image Processing, GeoSpatial Data Fusion
• Java, Java Enterprise, C++, Python
• JPEG2000, JPIP, Advanced 2D visualization
 Supporting/Developing FOSS4G projects
 GeoServer, MapStore
 GeoNetwork, GeoNode, Ckan
 Clients
 Public Agencies
 Private Companies
 http://www.geo-solutions.it
FOSS4G 2015, Seoul
14th-19th September 2015

3. Why Web Mercator
FOSS4G-EU 2015, Como
14th-17th July 2015

4. Why: it’s everywhere, it’s free
FOSS4G 2015, Seoul
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5. Why: familiar
FOSS4G 2015, Seoul
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6. Why: easy
FOSS4G 2015, Seoul
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7. Why: fair to the dateline
FOSS4G 2015, Seoul
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8. Some reasons to avoid web mercator
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9. One reason to rule them all
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10. Area distortion in web mercator
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11. Equal-area maps to the rescue
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Lambert azimuthal equal area
Mollweide

12. FAO example
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13. Distance perception
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http://braincrunch.tumblr.com/post/23672142073/mercators-egg

14. Equidistant maps to the rescue
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15. Example: weather radar maps
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https://weather.gc.ca/radar/index_e.html?id=xsm

16. Who ate my poles?!
FOSS4G 2015, Seoul
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17. Polar stereographic
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http://www.add.scar.org/home/add6

18. Polar stereographic
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http://www.polarview.aq/ (also GeoServer powered)

19. FAO Species Distribution
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20. Handling all these projections
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21. Should be simple no?
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22. Some examples
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23. Focusing on the pacific
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Would really like to see
Americas here…

24. PDC Mercator, EPSG:3832
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Antactica was here…
Funny
Greenland
…

25. Lambert conf. conic, EPSG:2225
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?!!

26. Datum change, ED50, EPSG:4230
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27. UTM32N, EPSG:32632
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28. What’s going on?
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29. And then… AUTO codes
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30. Automate! With APH
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31. APH step 1: which data to read
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Requested
Read

32. APH step 2: cut excess data
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33. APH step 3: data wrapping
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Requested
Read

34. APH step 4: detect dateline crossing
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35. Let’s try again
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36. Focusing on the pacific
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37. PDC Mercator, EPSG:3832
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38. Lambert conf. conic, EPSG:2225
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39. Datum change, ED50, EPSG:4230
FOSS4G 2015, Seoul
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40. UTM32N, EPSG:32632
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41. What’s cooking
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42. Data between 0 and 360
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43. APH step 2.5:dynamic densification
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44. Odds and ends
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45. That’s all folks!
Questions?
info@geo-solutions.it
FOSS4G 2015, Seoul
14th-19th September 2015