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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.

Published in: Technology

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 2017, Boston August 14th-19th 2017
  3. 3. Why Web Mercator FOSS4G 2017, Boston August 14th-19th 2017
  4. 4. Why: it’s everywhere, it’s free FOSS4G 2017, Boston August 14th-19th 2017
  5. 5. Why: familiar FOSS4G 2017, Boston August 14th-19th 2017
  6. 6. Why: easy FOSS4G 2017, Boston August 14th-19th 2017
  7. 7. Why: fair to the dateline FOSS4G 2017, Boston August 14th-19th 2017
  8. 8. Some reasons to avoid Web Mercator FOSS4G 2017, Boston August 14th-19th 2017
  9. 9. One reason to rule them all FOSS4G 2017, Boston August 14th-19th 2017
  10. 10. Area distortion in web mercator FOSS4G 2017, Boston August 14th-19th 2017
  11. 11. Equal-area maps to the rescue Lambert azimuthal equal area Mollweide FOSS4G 2017, Boston August 14th-19th 2017
  12. 12. FAO example FOSS4G 2017, Boston August 14th-19th 2017
  13. 13. Distance perception http://braincrunch.tumblr.com/post/23672142073/mercators-egg FOSS4G 2017, Boston August 14th-19th 2017
  14. 14. Equidistant maps to the rescue FOSS4G 2017, Boston August 14th-19th 2017
  15. 15. Example: weather radar maps https://weather.gc.ca/radar/index_e.html?id=xsm FOSS4G 2017, Boston August 14th-19th 2017
  16. 16. Who ate the poles?! FOSS4G 2017, Boston August 14th-19th 2017
  17. 17. Polar stereographic http://www.add.scar.org/home/add6 FOSS4G 2017, Boston August 14th-19th 2017
  18. 18. Polar stereographic http://www.polarview.aq/ (also GeoServer powered) FOSS4G 2017, Boston August 14th-19th 2017
  19. 19. FAO Species Distribution FOSS4G 2017, Boston August 14th-19th 2017
  20. 20. Handling all these projections FOSS4G 2017, Boston August 14th-19th 2017
  21. 21. Should be simple no? FOSS4G 2017, Boston August 14th-19th 2017
  22. 22. Some examples FOSS4G 2017, Boston August 14th-19th 2017
  23. 23. Focusing on the pacific Would really like to see Americas here… FOSS4G 2017, Boston August 14th-19th 2017
  24. 24. PDC Mercator, EPSG:3832 Antactica was here… Funny Greenland … FOSS4G 2017, Boston August 14th-19th 2017
  25. 25. Lambert conf. conic, EPSG:2225 ?!! FOSS4G 2017, Boston August 14th-19th 2017
  26. 26. Datum change, ED50, EPSG:4230 FOSS4G 2017, Boston August 14th-19th 2017
  27. 27. UTM32N, EPSG:32632 FOSS4G 2017, Boston August 14th-19th 2017
  28. 28. What’s going on? FOSS4G 2017, Boston August 14th-19th 2017
  29. 29. And then… AUTO codes FOSS4G 2017, Boston August 14th-19th 2017
  30. 30. Automate! With APH FOSS4G 2017, Boston August 14th-19th 2017
  31. 31. APH step 1: which data to read Requested Read FOSS4G 2017, Boston August 14th-19th 2017
  32. 32. APH step 2: cut excess data FOSS4G 2017, Boston August 14th-19th 2017
  33. 33. APH step 3: data wrapping Requested Read FOSS4G 2017, Boston August 14th-19th 2017
  34. 34. APH step 4: detect dateline crossing FOSS4G 2017, Boston August 14th-19th 2017
  35. 35. Let’s try again FOSS4G 2017, Boston August 14th-19th 2017
  36. 36. Focusing on the pacific FOSS4G 2017, Boston August 14th-19th 2017
  37. 37. PDC Mercator, EPSG:3832 FOSS4G 2017, Boston August 14th-19th 2017
  38. 38. Lambert conf. conic, EPSG:2225 FOSS4G 2017, Boston August 14th-19th 2017
  39. 39. Datum change, ED50, EPSG:4230 FOSS4G 2017, Boston August 14th-19th 2017
  40. 40. UTM32N, EPSG:32632 FOSS4G 2017, Boston August 14th-19th 2017
  41. 41. Some other hard data FOSS4G 2017, Boston August 14th-19th 2017
  42. 42. Data between 0 and 360 FOSS4G 2017, Boston August 14th-19th 2017
  43. 43. Satellites satellites FOSS4G 2017, Boston August 14th-19th 2017
  44. 44. And more satellites FOSS4G 2017, Boston August 14th-19th 2017
  45. 45. Final words FOSS4G 2017, Boston August 14th-19th 2017
  46. 46. APH step 2.5:dynamic densification FOSS4G 2017, Boston August 14th-19th 2017
  47. 47. In summary FOSS4G 2017, Boston August 14th-19th 2017
  48. 48. That’s all folks! Questions? info@geo-solutions.it FOSS4G 2017, Boston August 14th-19th 2017

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