A very short introduction to Coordinate Reference Systems Konzeptuelle Modellierung von Koordinatensystemen für Geodateninfrastrukturen Dr. Stefan A. Voser European Coordinate Reference Systems Dr. Stefan A. Voser National Coordinate Reference Systems in Europe Dr. Stefan A. Voser Worldwide Coordinate Reference Systems Dr. Stefan A. Voser crs insides Switzerland – Geoid CHGeo2004 Dr. Stefan A. Voser Worldwide – Geoid EGM2008 Dr. Stefan A. Voser Insides – Topics Coordinate Reference Systems Data Modelling Map Making Map Projections Spatial Data