Data visualization

Visualization of the data allowed for the comparison of results using mapping displays. Soils, terrain, and the coefficients from GWR models were interpolated and displayed. Mapped surfaces of coefficient values were overlaid with values of estimated credence. To properly display the surfaces and values together, a geometric classification scheme was used to symbolize coefficient raster surfaces, while estimations of credence (i.e. C:SE) were symbolized as points, using a manual classification, relying on Chebyshev’s theorem [59] to indicate values of: high levels of credence (<-3; >3), some credence (-3 to -2; 2 to 3) and little credence (>-2 to <2). Color-coded graphics were used to compare changes over time in both the study area, broadly, and in the values of specific points. The visual inspection of maps and charted data provided interpretable figures from which conclusions could be drawn.