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Quantification on the Aspect Parameter in Ecological Site Characterizations
Author(s) -
Fribourg Henry A.
Publication year - 1972
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1934320
Subject(s) - latitude , insolation , elevation (ballistics) , digital elevation model , declination , azimuth , elevation angle , ecology , basis (linear algebra) , physical geography , radius , environmental science , day length , geography , atmospheric sciences , geodesy , geology , mathematics , climatology , biology , geometry , remote sensing , physics , computer science , computer security , astronomy , photoperiodism , horticulture
A digital computer was developed which uses the Okanoue equation for evaluating the total potential solar radiation striking a point on the surface of the earth daily between 60° N and 60° S latitude, taking into account solar declination, radius vector, latitude, day length, azimuth from N and slope. Output consists of the relative insolation striking a sloping site expressed as a percentage of that striking a flat exposure at the same geographical location, elevation and time. Results may be obtained on a daily basis, a yearly basis, or a seasonal basis. Also, daily or weekly average day lengths can be obtained.