Environmental Engineering Reference
In-Depth Information
(a)
(b)
(c)
(d)
1371 -
461
211
210 - 91
90 - 25
460 -
Population estimate
more than census
N
Difference of Census 2000 Total Population
and Estimate Total Population
by Blocks
24 - 23
24 - 98
99 - 258
259 - 560
561 - 1522
W
E
S
Population estimate
less than census
0
5
10
Kilometers
20
FIGURE 14.4 Error maps of population estimates by blocks 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.
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