Geoscience Reference
In-Depth Information
Fig. 9.4
Scatter plots of urbanization levels of watersheds and parameter estimates from the GWR
models for developed land and water quality. For each Scatter plot, the
x
axis is percentage of
developed land, and the
y
axis is the parameter estimate from the GWR model for percentage of
developed land and a water quality indicator
No clear spatial pattern can be identified from the maps of
t
-value (Fig.
9.3
).
In order to more clearly understand how the relationships change across space in
response to urbanization level, percentage of developed land (PDLU) is used as
an indicator of urbanization level in watersheds, and then make a scatter plot of
PDLU and the parameter estimate from each of GWR models (Fig.
9.4
). Thus, the
scatter plot reflects how the correlations (reflected by parameter estimates) between
developed land and each water quality indicator vary across the urbanization gra-
dient. The scatter plots show that the relationships between developed land and
water quality indicators are significantly associated with the urbanization level in the
watersheds (Fig.
9.4
). The parameter estimates for SC, DS, and most of dissolved
