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:: [THA-1 SECOND PLENARY SESSION]

Document type:: Multivolume work

Structure type:: Chapter

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Title:: DEFORESTATION RATE IN BRAZILIAN AMAZONIA. Philip M. Fearnside, Antonio Tebaldi Tardin, Luiz Gylvan Meira Filho

Document type:: Multivolume work

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541 the "old" deforestation, and the region of study extended south of 16S in Mato Grosso. Re-analysis of the 1978 data set, to make the results compatible with the 1989 survey resulted in a best estimate of 54,130sq.km of deforested area by 1978, in addition to the "old" deforestation. The average rate of clearing over the 11.6 year period from the 1978 to the 1989 data sets was therefore 21,218 sq.km/year, .¿10%. The above uncertainty range results from 5% uncertainty from human inconsistency in measuring overlays of 1:250,000 scale images (tested by Tardin et aL 1990), and the rest from the uncertainty associated with the reanalysis of the 1978 data set. By 1988, deforestation in the forested portion of the region was estimated to have reached 343,972sq.km (Tardin and da Cunha, 1989), including old secondary forest area as deforested. This estimate was originally done with 101 LANDSAT-TM 1:250.000 images. Tardin et aL (1990) reported the value of 358,743sq.km, the difference being attributed to the inclusion of 26 additional such images. Both estimates include 3,861 sq.km of hydroelectric dams and 92,546sq.km of "old" secondary forest. Cloud cover over the region in 1988 forced the interpretation team at Brazil’s Institute for Space Research (INPE) to use (in addition to 77 images from 1988), 38 images from 1987, 6 from 1986, 5 from 1985 and 1 from 1984. The average date for the 1988 data set is April 1988. The rationale for not analysing the remaining 222-127 = 95 images for 1988 was the fact that a mosaic of black-and-white LANDSAT TM images in the scale of 1:1,000,000 showed no evidence of deforestation. The possible remaining doubt has now been eliminated with the extension of the analysis to the 222 images for 1989, as reported above. In order to derive now a best estimate for the deforested area by 1988, the small deforested areas previously disregarded were computed by assuming that their extent increased linearly from 0 in 1978 to the value measured in 1989 (of the order of 2,000sq.km), and interpolating for 1988. The new estimate for the deforested area by 1988 is thus 362,051 sq.km ¿5%, and it corresponds to the average date April 1988. Another deforestation rate can be also determined from the 1988 and 1989 data sets, resulting in 26,664sq.km ¿5%. This rate corresponds to a

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