Javier Jimenez Shaw

Hexagon based grids have gained particular attention in geospatial applications with their use in discrete global gridding systems (DGGS). A feature of many DGGS is the indexing of the grid cells at different resolutions to uniquely identify the cells.

The PROJ library (https://proj.org) is widely used in GIS and surveying software. Most of the people know it because of its ability to preform projections (v.g. Transverse Mercator or Spilhaus). However PROJ is able to do more things in addition to projections.

Mercator projection is nowadays hated by many people. A movement started (at least) in the 1970's by Arno Peters. However it has unique properties that other projections miss.

This educational talk will explain why we need a vertical reference for our coordinates, how we define “up” and “height”. How elevations were measured in the past, and how we now use GNSS to do it, and the implications of that.

WGS 84 (EPSG:4326) is the most commonly Coordinate Reference System used. It is the default in QGIS, the one used by OpenStreetMap, and what many people have in mind talking about latitude-longitude (or even for projected coordinates!).

Introduction to basic but important concepts about Coordinate Reference Systems (what is doable in 20 min ;) - Geographic Coordinate (Reference) Systems - Different Datums/Ellipsoids - Projections (Mercator, UTM, LCC, ...) - EPSG catalog - WKT (well known text) description - Refe…

In many surveying projects in construction, civil engineering, mining, surveying, etc. it is common to work on coordinates referenced to a local coordinate reference system (CRS) that is established ad hoc for the project site.

In many surveying projects in construction, civil engineering, mining, surveying, etc. it is common to work on coordinates referenced to a local coordinate reference system (CRS) that is established ad hoc for the project site.