Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [WA-4 GLOBAL MONITORING (2)]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: DEFORESTATION IN EQUATORIAL AFRICA: AN ASSESSMENT BASED ON ANALYSIS OF MULTIDATE LANDSAT MSS DATA. Susan M. Berta, Paul W. Mausel, John A. Harrington, Jr.

Document type:: Multivolume work

Structure type:: Chapter

247 DEFORESTATION IN EQUATORIAL AFRICA: AN ASSESSMENT BASED ON ANALYSIS OF MULTIDATE LANDSAT MSS DATA Susan M. Berta, Paul W. Mausel, John A. Harrington, Jr. Indiana State University Remote Sensing Laboratory, Indiana State University Terre Haute, IN, USA 47809 Robin Graham, Environmental Sciences Division, Oak Ridge National Laboratory P.O. Box 2008, Oak Ridge, TN, USA 37831 Abstract Information on land cover, as interpreted from spectral signatures, is used in assessing rates of environmental change for three areas in equatorial Africa using LANDSAT MSS data. The three study areas are: the Berberati - Carnot, Central African Republic region and two sites in Zaire. Four different information extraction procedures were utilized: maximun likelihood and nonparametric classifiers and Normalized Difference Vegetation Index (NDVI) analysis and Principal Components Analysis (PCA). Trends in landscape change are identified with SITE ONE as the primary example. This study revealed that deforestation is not occurring in the large, contiguous patches of rain forest. The greatest deforestation pressures exist in close proximity to population centers, along roadways, and at the edges of the contiguous rain forest. Regional changes are toward less vegetative vigor and degraded nonforest environments. KEY WORDS: Central African Republic, parametric, NDVI, land cover change INTRODUCTION Global atmospheric CO2 concentrations are rising and portend a general global warming (Tangley, 1988). Forests, which are an integral part of the global carbon cycle, represent 90 percent of the global carbon stored in vegetation. Estimates of the global carbon emissions from deforestation suggest that approximately a quarter are from Africa (Houghton et al., 1987). These estimates of carbon loss in Africa are uncertain since they are based on the estimated deforestation rates published by the 1980 FAO/UNEP Tropical Forest Resources Assessment Project (FAO/UNEP, 1981). Reliable, current, and quantitative data on forest area and deforestation rates are scarce for most tropical countries (Booth, 1989). Although satellite imagery has been used previously in South America, Southeast Asia, Madagascar, and the Ivory Coast of Africa (Nelson and Holben, 1986; Woodwell et al., 1987; Malingreau and Tucker, 1988; Malingreau et al., 1985; Singh, 1986; Green and Sussman, 1990; Repetto, 1990) few analyses have been done for the rain forests of equatorial Africa. DESCRIPTION OF THE STUDY AREAS This investigation involves three locations in the Zaire/Central African Republic region (Figure 1). SITE ONE is located in the southwestern portion of the Central African Republic, with a small area of eastern Cameroon included (centered on 4°30’N latitude, 15°30'E longitude), while SITE TWO is located along the western edge of Zaire (2°47'S latitude, 18°17'E longitude) and SITE THREE is located in northeastern Zaire (2°49'N latitude, 28°31’E longitude). SITE ONE lies at the northern margin of the Guineo-Congolian rain forest (Figure 2). Vegetation characteristics, described by White (1983), include drier Guineo-Congolian rain forest (rainfall averages between 1200 and 1600 nm per year) in the area south of Berberati and a mosaic of Guineo-Congolian rain forest and secondary grassland (where secondary grasslands refer to formerly forested areas destroyed by cultivation and fire) in the northern two-thirds of the study area. Within this latter cover type the grasslands occur in mosaic with small, usually severely degraded, patches of the original forest (found in lowland areas), and small patches of secondary thicket and secondary forest (White, 1983, p. 84). Major waterways include the Mambere River near the town of Carnot (SITE 1-F) in the northeastern section of SITE ONE and the Baumbe River near Amada-Gaza (Site 1-D) which flows south and empties into the Kadei River. 5*E 10*E 15*E 20*E 25*E 30*E Figure 1. Location of the study area.

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