- 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
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