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UID:pretalx-foss4g-europe-2026-SSCMFH@talks.osgeo.org
DTSTART;TZID=EET:20260630T120000
DTEND;TZID=EET:20260630T123000
DESCRIPTION:The PROJ library (https://proj.org) is widely used in GIS and s
 urveying software. Most of the people know it because of its ability to pr
 eform projections (v.g. Transverse Mercator or Spilhaus).\n\nHowever PROJ 
 is able to do more things in addition to projections. This talk will go th
 rough some of these features\, like datum transformations\, CRS catalogs (
 like EPSG\, ESRI\, IGNF\, ...)\, grid files\, geodetic computation\, proje
 ction distortion factors\, transformation pipelines\, etc.\n\nThe presenta
 tion will use the page https://jjimenezshaw.github.io/wasm-proj/ to show s
 ome of these features.
DTSTAMP:20260604T234143Z
LOCATION:A02
SUMMARY:PROJ is not only about projections - Javier Jimenez Shaw
URL:https://talks.osgeo.org/foss4g-europe-2026/talk/SSCMFH/
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UID:pretalx-foss4g-europe-2026-HFJQ9H@talks.osgeo.org
DTSTART;TZID=EET:20260701T150000
DTEND;TZID=EET:20260701T153000
DESCRIPTION:Hexagon based grids have gained particular attention in geospat
 ial applications with their use in discrete global gridding systems (DGGS)
 . A feature of many DGGS is the indexing of the grid cells at different re
 solutions to uniquely identify the cells. For hexagon based DGGS like H3 o
 r IGEO7 the underlying system for indexing is based on 2D generalized bala
 nced ternary (GBT).\n\nGBT was originally described in the 80s for use in 
 image analysis because of the similarity between hexagon grids and biologi
 cal vision systems. Here we discuss how GBT encodes indexes and discuss th
 e basics of GBT arithmetic in 2D hexagon grids. We demonstrate how GBT ari
 thmetic can be employed for neighbour traversal and more broadly spatial a
 lgorithms on hexagonal girds. Finally\, we will look at the special cases 
 that arise in the application of GBT to indexing in DGGS\, which are the c
 onsequences of necessary pentagons and non-GBT arranged base zones.
DTSTAMP:20260604T234143Z
LOCATION:A11
SUMMARY:Indexing with Hexagons: GBT Explained - Javier Jimenez Shaw\, Westo
 n Renoud
URL:https://talks.osgeo.org/foss4g-europe-2026/talk/HFJQ9H/
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