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Mappig and monitoring land degradation risks in the western Brazilian Amazon using multitemporal landsat TM/ETM + IMAGES. Repositório Alice
LU, D.; BATISTELLA, M.; MAUSEL, P.; MORAN, E..
Mapping and monitoring land degradation in areas under human-induced stresses have urgent tasks in remote sensing whose importance has not yet been fully appreciated. In this study, a surface cover index (SCI) is developed to evaluate and map potential land degradation risks associated with deforestation and accompanying soil erosion in a Western Brazilian Amazon rural settlement study area. The relationships between land-use and land-cover (LULC) types and land degradation risks as well as the impacts of LULC change on land degradation are examined. This research indicates that remotely sensed data can be effectively used for identification and mapping of land degradation risks and monitoring of land degradation changes in the study area. Sites covered by...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Land degradation risk; Surface cover index; Spectral mixture analysis; Landsat TM/ETM+; Amazon; Brazil.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/17677
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Mapping impervious surfaces with the integrated use of Landsat Thematic Mapper and radar data: a case study in an urban-rural landscape in the Brazilian Amazon. Repositório Alice
LU, D.; LI, G.; BATISTELLA, M.; FREITAS, C. C..
This research explored the integrated use of Landsat Thematic Mapper (TM) and radar (i.e., ALOS PALSAR L-band and RADARSAT-2 C-band) data for mapping impervious surface distribution to examine the roles of radar data with different spatial resolutions and wavelengths. The wavelet-merging technique was used to merge TM and radar data to generate a new dataset. A constrained least-squares solution was used to unmix TM multispectral data and multisensor fusion images to four fraction images (high-albedo, low-albedo, vegetation, and soil). The impervious surface image was then extracted from the high-albedo and low-albedo fraction images. QuickBird imagery was used to develop an impervious surface image for use as reference data to evaluate the results from TM...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Landsat TM; ALOS PALSAR L-band; RADARSAT-2 C-band; Wavelet-merging technique; Spectral mixture analysis; Impervious sufarce.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/902116
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