Steps in the creation of a dasymetric map of Utah Valley, Utah using the binary method. The left panel shows the original block groups. The second panel shows land known to be uninhabited, including water and public lands. The third panel shows the result of removing the uninhabited area and recalculating the density. Note the increased densities around the edge of the urban area.
A dasymetric map (from Greek δασύς dasýs 'dense' and μέτρο métro 'measure') is a type of thematic map that uses areal symbols to visualize a geographic field by refining a choropleth map with ancillary information about the distribution of the variable. The name refers to the fact that the most common variable mapped using this technique has generally been population density. The dasymetric map is a hybrid product combining the strengths and weaknesses of choropleth and isarithmic maps.[1]: 271
Dasymetric maps are used instead of choropleth maps because they represent underlying data distributions more accurately. Choropleth maps and dasymetric maps differ in three main ways. First, dasymetric zones are generated using ancillary data while boundaries on choropleth maps use units used for more general purposes (such as U.S. county boundaries). Second, choropleth zones have varying levels of internal homogeneity while dasymetric maps are designed to be internally homogeneous.[2] Last, choropleth mapping methods are standardized while dasymetric methods are under researched.[3]
^T. Slocum, R. McMaster, F. Kessler, H. Howard (2009). Thematic Cartography and Geovisualization, Third Edn, page 252. Pearson Prentice Hall: Upper Saddle River, NJ.
^Mennis, Jeremy (2003). "Generating Surface Models of Population Using Dasymetric Mapping". The Professional Geographer. 55: 31–42. doi:10.1111/0033-0124.10042. S2CID 35635180.
^Cite error: The named reference eicher2001 was invoked but never defined (see the help page).
A dasymetricmap (from Greek δασύς dasýs 'dense' and μέτρο métro 'measure') is a type of thematic map that uses areal symbols to visualize a geographic...
Included were early chorochromatic and flow maps, and possibly the first proportional point symbol and dasymetricmaps. Another example of early thematic mapping...
by careful design. A Dasymetricmap is a hybrid type that uses additional data sources to refine the boundaries of a choropleth map (especially through...
against the use of choropleth maps, instead espousing the virtues of the dasymetricmap. Nine years later, in 1947, Wright introduced the notion of geosophy...
The resultant maps are able to show detailed patterns of geographic distributions. Recent advancements in dot maps include using dasymetric mapping techniques...
(2010). "Pycnophylactic interpolation revisited: integration with the dasymetric-mapping method". International Journal of Remote Sensing. 31 (21): Hwahwan...
urban and rural populations on the same map, density of population, flow lines to show movement and the dasymetric technique. In 1845, he was appointed inspector...
after a high magnitude flood event. By using a Cadastral-based Expert Dasymetric System (CEDS) they were able to estimate the number of "vulnerable sub-populations"...
Global Information