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Gebremeskel



Dynamic Journal of Environmental Science and Technology

Available online at http://www.journaldynamics.org/djest

Vol.1(3), pp.13-23, April 2016

Article ID: DJEST/15/012

Copyright © 2016

 

Original Research Paper

Remote and Proximal Sensing Applications for the Determination of the Eutrophic Status of Highland and Rift Lakes of Ethiopia

Gezahegne Gebremeskel

Ethiopian Mapping Agency, P.O. Box 597 Addis Ababa, Ethiopia.

*Corresponding Author. E-mail:garikgg@rocketmail.com.

Received 26 December, 2015; Accepted 5 April, 2016, Available on-line 9 April, 2016.

Abstract

The principal objective of the study peers at determining the eutrophic state of a lake using imaging and non-imaging systems. The imaging system is based on the newly proposed “Lacustrine Eutrophic State Index (LESI)”. It is image algebra (image ratio) between two visible bands, Landsat ETM+ green and red spectral bands. The output of LESI later would be used as an input to the newly proposed “Green Axis Decision Rule” which allows to classify lakes in to eutrophic (productive), mesotrophic (moderately productive) and oligotrophic (unproductive or sterile) lake.
The proximal sensing is based on the application of grating Spectro-radiometer as a non-imaging system on a boat platform. Acquisition of reflectance data on the biological structure was attained through scanning of the Lake Abijata using Spectro-radiometer. Parametric analysis on the spectral profile exhibits the eutrophic state of the lake. Both of the proposed technical approaches had yielded tenable results. The technical approaches would contribute to the science and technology of remote sensing. It would also help environmentalists and limnologists for the automatic determination of lakes’ productivity. In turn, determination of lakes’ productivity offers benefit not only to the fishery industry, but also tourism, especially birds some of which are migratory like the flamingos.

Keywords: Proximal sensing, alloctonous, autochthonous.