Development of an Isohyetal Analysis for Oregon Using the Prism Modelby George H. Taylor, Oregon State Univ, Corvallis, United States,
Christopher Daly, Oregon State Univ, Corvallis, United States,
Wayne P. Gibson, Oregon State Univ, Corvallis, United States,
Abstract: PRISM (Precipitation-elevation Regressions on Independent Slopes Model) is an analytical model that uses point data and a digital elevation model (DEM) to generate gridded estimates of monthly and annual precipitation. PRISM is uniquely suited to regions with mountainous terrain because it incorporates a conceptual framework that addresses the spatial scale and pattern of orographic precipitation. This paper presents a brief overview and evaluation of PRISM as applied to the entire United States. The development of an updated isohyetal analysis for the state of Oregon is discussed. Using precipitation data from the National Climatic Data Center and the Soil Conservation Service, PRISM generated estimates of precipitation values for each grid cell. The gridded output was then imported into a geographic information system (GIS) for plotting and map creation. Data were made available to interested users in both hardcopy (map) and digital (numerical matrix) format. The updated isohyetal analysis is thought to be of quality and accuracy comparable to that of traditional labor-intensive methods of a fraction of the cost.
Subject Headings: Geographic information systems | Prism | Precipitation | Information systems | Terrain models | Regression analysis | Model accuracy | Data processing | Oregon | North America | United States
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