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Forest Cover Changes in Tropical South and Central America from 1990 to 2005 and Related Carbon Emissions and Removals. Repositório Alice
EVA, H. D.; ACHARD, F.; BEUCHLE, R.; MIRANDA, E. E. de; CARBONI, S.; SELIGER, R.; VOLLMAR, M.; HOLLER, W. A.; OSHIRO, O. T.; ARROYO, V. B.; GALLEGO, J..
This paper outlines the methods and results for monitoring forest change and resulting carbon emissions for the 1990-2000 and 200-2005 periods carried out over tropical Central and South America. To produce our forest change estimates we used a systematic sample of medium resolution satellite data processed to forest change maps covering 1230 sites of 20 km by 20 km, each located at the degree confluence. Biomass data were spatially associated to each individual sample site so that annual carbon emissions could be estimated. For our study area we estimate that forest cover in the study area had fallen from 763 Mha (s.e. 10 Mha) in 1990 to 715 Mha (s.e. 10 Mha) in 2005. During the same period other wooded land (i.e., non-forest woody vegetation) had fallen...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carbon emissions; Deforestation; Tropics; Remote sensing; Monitoring.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/924822
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Validation of the global land Cover 2000 map. Repositório Alice
MAYAUX, P.; EVA, H.; GALLEGO, J.; STRAHLER, A. H.; HEROLD, M.; AGRAWAL, S.; NAUMOV, S.; MIRANDA, E. E. de; DI BELLA, C. M.; ORDOYNE, C.; KOPIN, Y.; ROY, P. S..
The Joint Research Centre of the European Commission (JRC), in partnership with 30 institutions, has produced a global land cover map for the year 2000, the GLC 2000 map. The validation of the GLC2000 product has now been completed. The accuracy assessment relied on two methods: a confidence-building method (quality control based on a comparison with ancillary data) and a quantitative accuracy assessment based on a stratified random sampling of reference data. The sample site stratification used an underlying grid of Landsat data and was based on the proportion of priority land cover classes and on the landscape complexity. A total of 1265 sample sites have been interpreted. The first results indicate an overall accuracy of 68.6%. The GLC2000 validation...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Quality control; Statistics; Vegetation mapping.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1009181
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