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UID:pretalx-foss4g-2022-ZAB3FH@talks.staging.osgeo.org
DTSTART;TZID=CET:20220825T152500
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DESCRIPTION:Web Mapping as a technology and a method is now twenty years ol
 d. Within the \nOSGeo Community\, it has been fostered by projects such as
  OpenLayers \nand Leaflet. They evolved tightly intertwined with the frame
 work imposed by  \nfree data providers\, initially around commercial effor
 ts like Google and later \nOpenStreetMap. While useful in providing an eas
 y entry to web mapping\, and \nconvenient background layers\, these data p
 roviders also triggered a regression \ntowards centuries-old cartography t
 echniques\, in particular the Mercator projection. \nThis has become a maj
 or hurdle to web mapping\, particularly concerning global \ndata.    \n\n 
 \n\nThe Mercator map projection was created to aid sea faring in the XVI c
 entury and \nwas rendered useless with the advent of global positioning sy
 stems. Its use in \ncartography may still be acceptable at large scales\, 
 neighbourhood or city \nlevel\, but at smaller scales it imposes severe di
 stortion to distances and areas. \nFor global datasets in particular\, the
  Mercator projection is unusable\, for it \ncannot represent the full surf
 ace of the planet.   \n\n  \n\nWeb mapping developers may work around this
  framework with libraries such as D3 \nor proj4js\, and by setting up besp
 oke base layer services. But in doing so they \nface a different problem: 
 the deep dependence on the CRS index created by the \nEuropean Petroleum S
 urvey Group (EPSG). Primarily concerned with the survey and \nextraction o
 f fossil fuels\, the EPSG leans heavily on local or regional CRSs\, \nlarg
 ely ignoring global CRSs.  Hardly any of the more than 100 map projections
  \nand coordinate systems developed since the beginning of the XX century 
 feature \nin the EPSG index.  Landmark projections such as the Eckert seri
 es\, the \nHomolosine\, Eumorphic\, Dymaxion or the Snyder series were nev
 er included in the \nEPSG index.  Not even the classical Mollweide project
 ion (one of the turning \npoints towards modern cartography) appears in th
 e EPSG index. With a FOSS4G \nstapple such as MapServer\, this forces the 
 leveraging of map (re-)projections to \nthe client\, which is not always p
 ossible.     \n\n  \n\nWeb mapping with global data thus remains a technic
 al challenge with FOSS4G. \nThis address reviews several techniques and wo
 rk-arounds making global web \nmapping possible with familiar FOSS4G techn
 ologies. Starting with the \nappropriate configuration of CRS managing sof
 tware\, going through the set-up of \ndata servers and finally providing e
 xamples with web mapping clients.
DTSTAMP:20260403T192115Z
LOCATION:Room Limonaia
SUMMARY:Web Mapping with Global Map Projections - Luis Calisto\, Luís M. d
 e Sousa
URL:https://talks.staging.osgeo.org/foss4g-2022/talk/ZAB3FH/
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