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

Figure 6. Land Cover for Site 1-B in 1987. Statistics detailing the changes over the fourteen year time span are included in Table 4. Pixels classified as cloud, if present in 1973 or 1987, were excluded from the calculations of change in land cover. Table 4. Change in Land Cover* for the Six Sub-sites (in percent). 1-A 1-B 1-C CLOSED F. to OPEN F. 3.4 11.8 3.1 CLOSED F. to NONFOREST 0.1 0.1 1.3 OPEN F. to CLOSED F. 3.7 2.6 0.2 OPEN F. to NONFOREST 0.1 1.1 3.8 NONFOREST to CLOSED F. 2.2 1.4 0.3 NONFOREST to OPEN F. 4.0 48.1 4.0 No Change 86.5 34.9 87.3 * * * * * * * * * * * * * * * 1-D 1-E 1-F CLOSED F. to OPEN F. 15.5 6.7 23.4 CLOSED F. to NONFOREST 0.9 1.0 1.9 OPEN F. to CLOSED F. 1.6 0.4 1.1 OPEN F. to NONFOREST 7.6 19.1 18.8 NONFOREST to CLOSED F. 1.1 0.1 0.2 NONFOREST to OPEN F. 10.0 4.2 6.7 No Change 63.3 68.5 47.9 Figure 7. Land Cover for Site 1-C in 1973. / Figure 8. Land Cover for Site 1-C in 1987. *Pixels classified as clouds in 1973 or 1987 were excluded from the analysis. Change in Land Cover for SITE 1-A Within the 43,200 hectare sub-site, 86 percent of the area remained unchanged over time, with approximately 96 percent of the area classified as closed rain forest experiencing no change over the fourteen year period of this study. These results, combined with visual image interpretation, suggest that the large, contiguous patches of rain forest in this portion of the study area have not been subjected to deforestation. Site 1-A experienced very little reduction in forest cover over this period with less than 0.1 percent of the cloud-free portion of this sub-site changing from CLOSED FOREST to NONFOREST area. Most of the change (four percent) appears as scattered individual pixels throughout the main body of the rain forest changing to OPEN FOREST. The regularity in the line spacing associated with seme of the pixel "scatter" may be attributed to radiometric distortions (striping) which are minimized but are not totally eliminated. Hence, some of the "forest change" should not be interpreted as change at all but rather as radiametrically-induced uncertainty. However, some of the CLOSED FOREST which changed to OPEN FOREST may refer to thinning of the rain forest. Land area classified as OPEN FOREST in 1973 changed to CLOSED FOREST (3.7 percent). The geographic distribution of these changes suggests that these pixels classified as OPEN FOREST in 1973 my have been sections of rain forest with small openings in the canopy (borderline CLOSED FOREST/OPEN FOREST classification). Overal 1, six percent of the area mapped as NONFOREST in 1973 was designated as a forest vegetation in 1987 thereby suggesting possible change from immature plantations among the agricultural fields to mature plantations in 1987. Change in Land Cover for SITE 1-B Site 1-B experienced the greatest amount of change in land cover (over 65 percent of the area). This

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