The temporal resolution of the data was decreased from daily to weekly to monthly to yearly. By increasing this resolution, more subtle variations were defined. The number of groups was increased from 4 to 6 to 9 to 16. Three experiments were performed to determine how the regions of homogeneous snowpack characteristics changed. ![]() To identify areas of similar snow accumulation, persistence, and ablation patterns, data were transformed by dividing by the 15 year average peak SWE. Daily data for 216 stations using 15 years (1991–2005) of data from 1 October through 30 June were used. SOMs are a specific application of artificial neural networks. ![]() We used self-organizing maps (SOMs) to define regions of homogeneity in the Colorado River Basin using snow telemetry (SNOTEL) snow water equivalent (SWE) data.
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