This work was carried out in collaboration by all authors. Author GTA wrote the design of the work, provided the materials for and led the field trip as well as wrote the first draft of this manuscript. Author JDN converted all analogue data into digital format and interpreted the Satellite Remote Sensing/GIS processed images. Author MO did the literature review for this work and was a very useful hand in the field. All authors analysed the results, read and approved the final manuscript.
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