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Assistance to the Forestry Development Authority, Liberia. Project Findings and Recommendations

Terminal Report

Year of publication 1986

Pages 30 p.

Author Forest management Division

Product type Project

Category Programme / project report

Edition 1

Synopsis (short abstract) The broad objectives of the project were to: – strengthen FDA in all aspects of its development and operation; – establish a trial industrial plantation of 1 600 ha using both fast-growing exotic and indigenous species; – train Liberian staff; and – set up studies and surveys as necessary.

Language English

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    In the context of developing a practicable and cost effective method for obtaining a country’s forest area by remote sensing, the computer processing of NOAA AVHRR HRPT data covering Liberia was investigated. The only cloud-free scene then recorded turned out to be severely and unevenly affected by atmospheric haze. To mitigate the effects of this, the country was divided into six areas (strata) of more uniform haze conditions. Pixel DN values were obtained for forest and adjoining formations on transects within each stratum, for the first four AVHRR channels and three transforms: NDVI (2-1/2 + 1), IND3 (3-2/3 + 2), IND4(4-2/4 + 2). After analyzing the transects and comparing them with the available reference data (a mixture of large scale colour composite Landsat TM and MSS images for 1989 and 1986 respectively), channels 2, 3, 4 and IND3 were retained for processing. This was done by applying three methods to each stratum - thresholding, maximum likelihood classification using cluste ring signatures (hybrid), m.l.c. using training area signatures - and directed at separating the 5 main classes distinguishable on the Landsat images: Closed forest, Disturbed forest, Shifting cultivation and regrowth, Cultivation and Other.
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    This report covers the work of forest resources mapping undertaken by the Remote Sensing Unit of the Forestry Development Authority of Liberia between March 1982 and June 1984. Its principle aim is to reassess the actual forest cover area of Liberia by interpretation of recent aerial photography and the subsequent transfer of this photo detail to 1 in 125,000 map series. The procedures adopted for this mapping study are detailed. In conjunction with this work a deforestation study was also carri ed out using the same selected areas from each of the 1953, 1969 and 1979/82 aerial photography series. The results of these studies are discussed and related to previous estimates that have been made. The results include information about forest areas (by forest type and in three slope classes).
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    This paper is written in fulfilment of the requirement of the Associate Regional Advisers (ARA) Programme which is run under the auspices of the Forest Industries Advisory Group (FIAG) for Africa. The objective of the Forest Industries Advisory Group is to assist African countries in promoting the growth of forest industries and their optimum contribution to economic and social development.
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