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A climatography-based study of aerial reconnaissance probabilities for Oregon's Willamette Valley

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https://ir.library.oregonstate.edu/concern/graduate_projects/wm117p69n

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  • The needs and markets for aerial photography have grown steadily with the increasing demands for improved resource management (Kodak, 1985, 2 & Simonett, 1983, 1). Aerial photography within the Willamette Valley could provide researchers and professionals with a broad range of data in disciplines such as agriculture, forestry, geology, and urban planning. The primary objective of this study was to determine daily probabilities of meteorological conditions suitable for the acquisition of aerial photography within Oregon's Willamette Valley. Because aerial probability data were available for only three stations within the Willamette Valley, an applied climatography was developed to assess the climatic homogeneity of the study area. Strong climatic homogeneity was required to show that probability data (P or P values) from only three stations were representative of the entire study area. The climatography section assessed the climatic homogeneity of the study area by addressing the following topics: 1) the identification of the major synoptic scale climatic elements that influence the study area, 2) the evaluation of climographs between weather stations located within and outside the study area, 3) the results of previous mesoscale precipitation studies within the Willamette Valley, and 4) the interpretation of climatic isomaps constructed from 30 years of climatic data of the study area. The aerial reconnaissance probability section evaluated P values derived for the Portland, Salem, and Eugene weather stations by addressing the following topics: 1) the selection of meteorological parameters used to derive the P values, 2) the identification of the highest P values and periods of highest P values, and 3) a discussion of local physiographic controls in determining slight differences in P values between the three stations.
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