After reviewing the year-to-date data of precipitation levels in Los Angeles County, it appears that more recently there is less rainfall collecting in west Los Angeles County than during a usual season. The highest precipitation occurs in the eastern part of the County, particularly near the Angeles National Forest. While both the Kriging and Spline techniques of interpolation convey this phenomenon, the Kriging interpolation seems to present the precipitation data more generally, whereas Splining appears to capture the data points in between the gauging stations more. The splining technique also shows more variance in values between the gauging stations, which helps show greater difference when comparing the year-to-date and season normal data (last image). For these reasons, and since splining is best for representing smoothly-varying surfaces, I believe splining is the best technique for presenting rainfall information.
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