Difference between revisions of "Main Page/Research/Smart Maps/dwelling units"

Revision as of 15:25, 6 May 2010

Create a smart map raster that represents the count or density of dwelling units

1. decide on a cell size in advance
   1. if the cell size is 10 m, then the area of the cell is 100 m² = 1076 ft²
2. prepare parcel data with number of dwelling units per parcel (I used precision 18 scale 10)
3. add a field for du_per_[cell] (e.g., du_per_10m_cell)
   1. calculate as dwelling_units * conversion / shape_area

      e.g., for 10 m² cells, the conversion will be 1076

      to give the number of dwelling units per cell²

4. convert to raster at 10 m spacing (32.808 ft), call it [du_per_cell]
5. convert the raster to points

   now there is a data set of points where each point has the value of the number of dwelling units per cell/point

6. simple density moving window analysis with 833 m (2734 ft) radius and population field = grid_code, units square meters (call this grid simple_dens)
7. multiply simple_dens by the radius area to obtain focal count (following this analysis, [simple_dens] * sqr (833) * pi