Dasymetric mapping for population and sociodemographic data redistribution - Urban Remote Sensing: Monitoring, Synthesis and Modeling in the Urban Environment - page 191

(a) (b)

(c) (d)

N

W E

S

0 5 0 20

Kilometers

Persons Per Square Kilometers

0
<

500.1 - 1,500
1,500.1 - 3,000

3,000.1 - 5,000
> 5,000

Blockgroups
County boundary = 500

FIGURE 14.3 Dasymetric maps of population density by block group for Gwinnett County: (a) binary method using NLCD
2001; (b) binary method using LandPro 2001; (c) binary method using 2001 parcel data; (d) N-Class method using Dasymetric
Mapping Extension and NLCD 2001.

need to apply the mask of highways, parks, and other similar
features (as was necessary for the NLCD layer). Our defini-
tion of residential area, using the LandPro ancillary data was:
1 = residential area (LandPro codes: Low Density Single Family
Residential [111], Medium Density Single Family Residential
[112], High Density Residential [113], Multifamily Residential
[117], and Mobile Home Parks [119]), and 0

(parcel codes: Residential SFR [101], Residential Duplex [102],
Residential Triplex [103], Residential Quadplex [104], Mixed
Residential/Commercial [105], Condominium - Common Ele-
ment [106], Condominium - Fee Simple [107], Mobile Home
[108], Apartments - Three Story and Under [211], and Mobile
Home Park [213]), and 0 = non-residential area (all other
parcel codes). Figure 14.3b and c depict the block-group pop-
ulation densities using the LandPro and parcel data, respec-
tively.

=

non-residential
area (all other LandPro codes). Our definition of residential area,
using the Gwinnett County parcel data was: 1

=

residential area