Figures & data
Figure 1. The seven-county Twin Cities metropolitan area, Minnesota, USA.
Figure 2. Accuracy of the TM-estimated per cent imperviousness images.
Figure 3. Per cent impervious surface maps of 1991 (a, b) and 1999 (c, d) for both methods (Method A – adjusted impervious surface map with highway centerline and areas greater than 75% imperviousness masked out; Method B – pure residential impervious surface map with all non-residential areas masked out).
Figure 4. Two-, five- and seven-county population density estimation models of Method A.
Figure 5. Two-, five- and seven-county population density estimation models of Method B.
Figure 6. Overall performance of two-, five- and seven-county population density estimation models of Method A.
Figure 7. Overall performance of two-, five- and seven-county population density estimation models of Method B.
Table 1. Performance statistics of population density estimation models.
Figure 8. Comparison of 1991 and 1999 population density models of Method B.
