An improved Thiessen grid for eastern Oregon: an interstation correlation study determining the effect of distance, bearing, and elevation between stations upon the precipitation correlation coefficient
✍ Scribed by Forrest A. Sneva; Lyle D. Calvin
- Publisher
- Elsevier Science
- Year
- 1978
- Weight
- 878 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Sneva, F. A. and Calvin, L. D., 1978.
An improved Thiessen grid for eastern Oregon: an interstation correlation study determining the effect of distance, bearing, and elevation between stations upon the precipitation correlation coefficient. Agric. Meteorol., 19: 471--483.
Multiple regression analysis of approximately 2,500 interstation correlation coefficients of crop-year precipitation (October--June, inclusively) from 74 stations in eastern Oregon yielded significant (P ~ 0.01) regression coefficients for bearing and horizontal distance and a non-significant regression coefficient was obtained for elevation difference between stations. Higher correlation coefficients were found for stations oriented in a SW--NE direction than for stations lying in a SE--NW direction. Correlation coefficients between stations decreased as horizontal distance between them increased ; however, this decrease was influenced by the bearing between stations. Construction of an isohomeotrope (line of equal correlation) diagram utilizing the two primary determinants provides opportunity to (1) select for any given area in eastern Oregon that station having the most similar fluctuations in precipitation, (2) project for any given station the area it represents for predetermined levels of r, and (3) permit the construction for eastern Oregon of a Thiessen-like grid depicting bounded areas of equal crop-year precipitation similarity.