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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 23, No. 9, 2019, pp. 1649-1654
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Bioline Code: ja19244
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Applied Sciences and Environmental Management, Vol. 23, No. 9, 2019, pp. 1649-1654
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Determination of Net Radiation Balance using Satellite Imagery in Odeda Local Government Area, Ogun State, Nigeria
UFOEGBUNE, GC; OBIAKOR, KC; FADIPE, OB & ILEVBAOJE, OO
Abstract
The energy received on the earth surface is responsible for driving activities on the earth and not all
energy emitted by the sun reaches the earth surface; some are absorbed, reflected or scattered. There is need to determine
the amount of energy that reaches the earth surface since not all the energy emitted from the sun reaches the earth. This
energy is also responsible for making our general climate warm which ultimately brings us to the determination of Net
radiation. This study applied remote sensing method to determine net radiation over Odeda Local Government Area. A
Sentinel image from 2013 covering the study area was downloaded and computations were done using bands 5 and 7.
These bands were used to compute the surface albedo, incoming short wave radiation, incoming long wave radiation and
outgoing long wave radiation. The spectral signatures for each component from sentinel data were analysed, using the
ArcGIS 10.6. The results showed the net radiation to be of moderate intensity with values ranging between 630.83 wm-2
and 684.68 wm-2. The mean value over majority of the area was 651.20 wm-2 and the albedo of the area was low, with
values ranging from 0.0028 to a value of 0.29 which is an indication of low reflectivity. This implied that more radiation
was absorbed in the study area which impacted the soil temperature thereby influencing reduced soil moisture and a higher
rate of evapotranspiration from plants within the study area.
Keywords
thermal energy; atmospheric transmissivity; spatial analysis; surface albedo
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© Copyright 2019 - Ufoegbune et al.
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