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Mapping the world beyond web mercator - FOSS4G 2015

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Mapping the world beyond web mercator - FOSS4G 2015

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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.

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.

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Mapping the world beyond web mercator - FOSS4G 2015

  1. 1. Mapping beyond web mercator Ing. Andrea Aime GeoSolutions
  2. 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. 3. Why Web Mercator FOSS4G-EU 2015, Como 14th-17th July 2015
  4. 4. Why: it’s everywhere, it’s free FOSS4G 2015, Seoul 14th-19th September 2015
  5. 5. Why: familiar FOSS4G 2015, Seoul 14th-19th September 2015
  6. 6. Why: easy FOSS4G 2015, Seoul 14th-19th September 2015
  7. 7. Why: fair to the dateline FOSS4G 2015, Seoul 14th-19th September 2015
  8. 8. Some reasons to avoid web mercator FOSS4G 2015, Seoul 14th-19th September 2015
  9. 9. One reason to rule them all FOSS4G 2015, Seoul 14th-19th September 2015
  10. 10. Area distortion in web mercator FOSS4G 2015, Seoul 14th-19th September 2015
  11. 11. Equal-area maps to the rescue FOSS4G 2015, Seoul 14th-19th September 2015 Lambert azimuthal equal area Mollweide
  12. 12. FAO example FOSS4G 2015, Seoul 14th-19th September 2015
  13. 13. Distance perception FOSS4G 2015, Seoul 14th-19th September 2015 http://braincrunch.tumblr.com/post/23672142073/mercators-egg
  14. 14. Equidistant maps to the rescue FOSS4G 2015, Seoul 14th-19th September 2015
  15. 15. Example: weather radar maps FOSS4G 2015, Seoul 14th-19th September 2015 https://weather.gc.ca/radar/index_e.html?id=xsm
  16. 16. Who ate my poles?! FOSS4G 2015, Seoul 14th-19th September 2015
  17. 17. Polar stereographic FOSS4G 2015, Seoul 14th-19th September 2015 http://www.add.scar.org/home/add6
  18. 18. Polar stereographic FOSS4G 2015, Seoul 14th-19th September 2015 http://www.polarview.aq/ (also GeoServer powered)
  19. 19. FAO Species Distribution FOSS4G 2015, Seoul 14th-19th September 2015
  20. 20. Handling all these projections FOSS4G 2015, Seoul 14th-19th September 2015
  21. 21. Should be simple no? FOSS4G 2015, Seoul 14th-19th September 2015
  22. 22. Some examples FOSS4G 2015, Seoul 14th-19th September 2015
  23. 23. Focusing on the pacific FOSS4G 2015, Seoul 14th-19th September 2015 Would really like to see Americas here…
  24. 24. PDC Mercator, EPSG:3832 FOSS4G 2015, Seoul 14th-19th September 2015 Antactica was here… Funny Greenland …
  25. 25. Lambert conf. conic, EPSG:2225 FOSS4G 2015, Seoul 14th-19th September 2015 ?!!
  26. 26. Datum change, ED50, EPSG:4230 FOSS4G 2015, Seoul 14th-19th September 2015
  27. 27. UTM32N, EPSG:32632 FOSS4G 2015, Seoul 14th-19th September 2015
  28. 28. What’s going on? FOSS4G 2015, Seoul 14th-19th September 2015
  29. 29. And then… AUTO codes FOSS4G 2015, Seoul 14th-19th September 2015
  30. 30. Automate! With APH FOSS4G 2015, Seoul 14th-19th September 2015
  31. 31. APH step 1: which data to read FOSS4G 2015, Seoul 14th-19th September 2015 Requested Read
  32. 32. APH step 2: cut excess data FOSS4G 2015, Seoul 14th-19th September 2015
  33. 33. APH step 3: data wrapping FOSS4G 2015, Seoul 14th-19th September 2015 Requested Read
  34. 34. APH step 4: detect dateline crossing FOSS4G 2015, Seoul 14th-19th September 2015
  35. 35. Let’s try again FOSS4G 2015, Seoul 14th-19th September 2015
  36. 36. Focusing on the pacific FOSS4G 2015, Seoul 14th-19th September 2015
  37. 37. PDC Mercator, EPSG:3832 FOSS4G 2015, Seoul 14th-19th September 2015
  38. 38. Lambert conf. conic, EPSG:2225 FOSS4G 2015, Seoul 14th-19th September 2015
  39. 39. Datum change, ED50, EPSG:4230 FOSS4G 2015, Seoul 14th-19th September 2015
  40. 40. UTM32N, EPSG:32632 FOSS4G 2015, Seoul 14th-19th September 2015
  41. 41. What’s cooking FOSS4G 2015, Seoul 14th-19th September 2015
  42. 42. Data between 0 and 360 FOSS4G 2015, Seoul 14th-19th September 2015
  43. 43. APH step 2.5:dynamic densification FOSS4G 2015, Seoul 14th-19th September 2015
  44. 44. Odds and ends FOSS4G 2015, Seoul 14th-19th September 2015
  45. 45. That’s all folks! Questions? info@geo-solutions.it FOSS4G 2015, Seoul 14th-19th September 2015

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