Accession Number : AD0725758

Title :   Photogrammetrically Determined Cloud-Free Lines-of-Sight at Columbia, Missouri.

Descriptive Note : Final rept. Dec 67-Feb 71,

Corporate Author : MISSOURI UNIV COLUMBIA DEPT OF AGRICULTURAL ENGINEERING

Personal Author(s) : Shanklin,Milton D. ; Landwehr,Joseph B.

Report Date : APR 1971

Pagination or Media Count : 193

Abstract : The probability of a cloud-free line-of-sight was determined at specified elevation angles and directions by using a camera with a 180 degree lens and infrared film to produce high-quality photograms of the sky. Three years of hourly data were used to analyze the probability with respect to the parameters of azimuth, elevation angle, season, time of day, sky cover, cloud type, and sunshine. A very unique probability surface as a function of sky cover and elevation angle of the line-of-sight, the two most important parameters, was constructed. The persistency of a cloud-free line-of-sight was determined by utilizing a summer season of photograms taken at five minute intervals. The persistency was analyzed for diurnal variations up to six hours of consecutive observations. (Author)

Descriptors :   (*CLOUD COVER, MISSOURI), (*AIR TRAFFIC, VISIBILITY), PHOTOGRAPHY, AZIMUTH, PROBABILITY, SOLAR RADIATION, PERIODIC VARIATIONS, CORRELATION TECHNIQUES, CAMERAS, PHOTOGRAMMETRY

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE