Dasymetric map
![Comparison of a choropleth map (top) and a dasymetric map (bottom) of the population of the San Francisco Bay Area in 2000.[1]](/uploads/202501/07/DasymapBG_Bay_Area_choropleth_and_dasymetric_maps5759.jpg)
The dasymetric map is a method of thematic mapping, which uses areal symbols to spatially classify volumetric data. The method was developed and named in 1911 by Benjamin (Veniamin) Petrovich Semenov-Tyan-Shansky and popularised by J.K. Wright.