DIURNAL, SEASONAL AND TOPOGRAPHICAL EFFECTS ON VERTICAL REFRACTION
DIURNAL, SEASONAL AND TOPOGRAPHICAL EFFECTS ON VERTICAL REFRACTION
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Date
1987-06
Authors
MOSES, OLUMUYIWA ODETOLA
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Abstract
In this investigation, the effect of season, time
of the day and topography has been examined. Two lines,
one on water of length 1098.650 meters and the other
1287.05 meters on land were selected for the study.
Coefficient of refractions on these two lines for
different time of the day - 0800 hours to 1600 hours
and for different seasons - dry and wet seasons were
computed. Analysis of data revealled that variations
of refraction on the two lines was less in wet seasons
than in dry season. Also refraction was found to be
minimum and more steady between the hours of 1200 -
1600. This confirmed the statement found in most
text books and survey literatures. The values of
coefficient of refraction obtained from this study
are higher than the traditional values. This may be
due to the fact that the lines are relatively short.
The importance of meteorology in high order
work is much emphasised
Description
As thesis submitted to the Post
Graduate School, Ahmadu Bello
University in partial fulfillment
of the requirements for the degree
of Master of Science in Land
Surveying.
Department of Land Surveying
Faculty of Engineering
Ahmadu Bello University
Zaria - Nigeria
June, 1987
Keywords
DIURNAL,, SEASONAL,, TOPOGRAPHICAL,, VERTICAL REFRACTION