Daysymetric Mapping Using National Structure Inventory

This code uses a dasymetric mapping technique to distribute attribute values defined at the zip code level to
new attribute values at the census county level. The attribute to be mapped is the number of people in each zip
code who are using durable medical equipment such as a wheelchair. The National Structures inventory point data
is used as the mechanism to distribute the zip
code attributes across the zip code polygons. The inventory points have been screened for residential structures
with hotels excluded. Multi-occupancy residential structures have been assigned a weight representing the expected
number of residents within the structure. Once the zip code attribute values have been distributed to all the
building points, the census county polygons are used to select points within the county boundary and add up the
values. These sums then become the mapped attributes for each census county.