"a technique in which attribute data that is organized by a large or arbitrary area unit is more accurately distributed within that unit by the overlay of geographic boundaries that exclude, restrict, or confine the attribute in question. For example, a population attribute organized by census tract might be more accurately distributed by the overlay of water bodies, vacant land, and other land-use boundaries within which it is reasonable to infer that people do not live."
-https://support.esri.com/en/other-resources/gis-dictionary/term/dasymetric%20mapping
For the lab this week we focused on dasymetric mapping and I found this definition from esri helpful so I wanted to add it here. This week really focused a lot on basic arcGIS skills with an in depth understanding of how populations are distributed. For the lab we used a raster product of population density or imperviousness to get more accurate estimates for populations in certain areas.
This image is a layout of the census tracts used for the population clipped and erased to remove hydrology features. It is overlayed on the raster of imperviousness to show the population densities. This product along with many statistical editing allowed us to calculate more accurate population estimates.
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