Special Topics: Lab 15

In the final lab for the course, the focus was on Dasymetric mapping.  Dasymetric mapping uses additional information such as land type to improve determining where populations are allocated.  To help get a better idea of where the population is distributed, impervious data of roads to remove areas where people are unlikely to live.

To perform this analysis, I used the Zonal Statistics as Table tool to find the impervious areas of the census tracts.  Then I joined the new table to the census tract data.  Next I used the Intersect tool for the census tract and high school layers.  I added a field to calculate the area of the new layer.  I also used the impervious against the area to find a new area.  I used the new area multiplied by the population and divided by the before area to calculate the new population.

The reference population was 54,720 and the estimated was 54,661.  About 12% of the population is allocated incorrectly.