You are advised to study three sections from the onlline version of the lesson “GEOG 486: Cartography and Visualization”, by Cary Anderson, Lecturer and Fitz Kessler, Teaching Professor, MGIS program, The Pennsylvania State University, which is part of the Repository of Open and Affordable Materials at Penn State, licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License(link is external). These sections are:
Move on to the presentation Spatial data models and dimensions of spatial entities (see Course Materials) to learn more about the two models used to represent spatial entities and phenomena and the dimensions of spatial entities.