Geospatial Data

This chapter addresses the visualization of geospatial data. With this term we refer to any kind of data that carry information about locations on the Earth’ s surface. Geospatial data are in a way equivalent to trivariate data, except they carry information specific to locations on the Earth’s surface-typically country, region, province, and/or other boundaries-but in some cases also cities, rivers, and other such landmarks. The chapter introduces and discusses four tools for representing geospatial data: choroplet maps, hexgrid maps, proportional symbol maps, and cartograms.