Deforestation in Central Africa: Estimates at regional, national and landscape levels by advanced processing of systematically-distributed Landsat extracts

Duveiller, Grégory; Defourny, Pierre; Desclée, Baudouin; Mayaux, Philippe

doi:10.1016/j.rse.2007.07.026

Cited by 227 publications

(159 citation statements)

References 19 publications

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“…The Object-Oriented Combination technique, which is an important tool for the effective classification and mapping of land use classes, was adopted in this study (Duveiller et al, 2008). This phase focused on the characterization of visual aspects of the observed objects, which allows their recognition and identification.…”

Section: Preparation Of the Land Use And Occupation Mapmentioning

confidence: 99%

Land use and its impacts on the water quality of the Cachoeirinha Invernada Watershed, Guarulhos (SP)

Oliveira¹,

Vargas²,

Saad³

et al. 2018

Rev. ambiente água

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The urbanization process through which large urban centers have been passing has drastically affected the availability and especially the quality of water. The Cachoeirinha Invernada Watershed (CIW), located in the municipality of Guarulhos (State of São Paulo, Brazil), includes areas with different land use classes. This paper aims to correlate the spatial and temporal effects of land use and land cover on the water quality of the Cachoeirinha Invernada Watershed. In a period of 12 months and at six sampling points along the watershed, the physicochemical parameters temperature (T), pH, turbidity (TU), total solids (TS), electrical conductivity (EC), total phosphorus (TP), biochemical oxygen demand (BOD), as well as microbiological analysis (E. coli) were measured. Water quality was assessed using a modified version (WQIM) of the Water Quality Index (WQI) and the Trophic State Index (TSI). The areas surrounded by urban development presented a marked worsening in water quality, with the downstream point most affected and ranked as 'POOR'. From the evaluated parameters, what contributed most to water quality degradation of the Cachoeirinha Invernada Watershed (CIW) was E. coli, followed by BOD, and TP, all parameters related to the presence of sewage in the water. The need for the construction of sewerage and waste treatment, protection and recovery of riparian forests, and environmental education regarding waste disposal are necessary to significantly improve the environmental quality of the Cachoeirinha Invernada Watershed. correlacionar os efeitos espaciais e temporais do uso da terra e da cobertura do solo na qualidade da água dessa bacia hidrográfica.. Foram analisados, em um período de 12 meses e em seis pontos de amostragem na área da bacia hidrográfica, parâmetros físico-químicos como a temperatura (T), pH, turbidez (TU), sólidos totais (ST), condutividade elétrica (CE), fósforo total (FT), demanda bioquímica de oxigênio (DBO), bem como análise microbiológica (E. coli). A qualidade da água foi avaliada usando uma versão modificada (WQIM) do Índice de Qualidade da Água (IQA) e do Índice do Estado Trófico (IET). As áreas cercadas pelo desenvolvimento urbano apresentaram um acentuado agravamento na qualidade da água, com o ponto a jusante mais afetado e classificado como 'POBRE'. A partir dos parâmetros avaliados, o que mais contribuiu para a degradação da qualidade da água da BHCI foi E. coli, seguido de DBO e FT, parâmetros esses relacionados à presença de esgoto na água. A necessidade de construção de esgoto e tratamento de resíduos, proteção e recuperação de matas ciliares e educação ambiental com foco na eliminação de resíduos são necessárias para melhorar significativamente a qualidade ambiental da bacia hidrográfica Cachoeirinha Invernada.Palavras-chave: degradação ambiental, eutrofização, águas urbanas, poluição da água.

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Section: Preparation Of the Land Use And Occupation Mapmentioning

confidence: 99%

Land use and its impacts on the water quality of the Cachoeirinha Invernada Watershed, Guarulhos (SP)

Oliveira¹,

Vargas²,

Saad³

et al. 2018

Rev. ambiente água

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“…Nelson and Horning 1993;Viña et al 2004;Vågen 2006;Duveiller et al 2008;Hansen et al 2008). With the opening of the Landsat 7 archive by the US Geological Service (USGS) in January 2009, a wide array of satellite scenes became available.…”

Section: Satellite Data and Analysismentioning

confidence: 99%

Analysis of deforestation patterns in the central Menabe, Madagascar, between 1973 and 2010

et al. 2013

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The central Menabe region still holds the largest remnant of dry forest in western Madagascar. These forests are home to high floral and faunal diversity including a number of local and regional endemics. The forests of the central Menabe have been classified as conservation hotspots. However, pressure on these forests is strong and deforestation continues on a large scale. To quantify recent forest loss, we used a series of satellite images for estimating annual deforestation rates. The overall rate was 0.67 %, but it accelerated during certain periods to over 1.5 % with a maximum of 2.55 % per year between 2008 and 2010. Not all areas within the forest block of the central Menabe are affected similarly. Areas surrounding existing clearings show the highest losses of largely undisturbed forest. If deforestation continues at the same rate as during the last years, 50 % of the 1973 forest cover will be gone within the next 11-37 years.

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“…Gould, 2000;Griffiths et al, 2000;Oindo and Skidmore, 2002;Kerr et al, 2001;Rocchini et al, 2006). Indeed many studies have used land cover data, often as a surrogate for data on habitat type, and frequently exploited the temporal dimension of remote sensing to monitor land cover dynamics (Kral and Pavlis, 2006;Duveiller et al, 2008;Munoz-Villers and Lopez-Blanco, 2008;Kerr et al, 2001;Luoto et al, 2002Luoto et al, , 2004Cohen and Goward, 2004;Bergen et al, 2007;Fuller et al, 2007;Lassau and Hochuli, 2007).…”

Section: Remote Sensing: Targeted Mappingmentioning

confidence: 99%

An overview of recent remote sensing and GIS based research in ecological informatics

Boyd

Foody

2011

Ecological Informatics

114

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This article provides an overview of some of the recent research in ecological informatics involving remote sensing and GIS. Attention focuses on a selected range of issues including topics such as the nature of remote sensing data sets, issues of accuracy and uncertainty, data visualization and sharing activities as well as developments in aspects of ecological modeling research. It is shown that considerable advances have been made over recent years and foundations for future research established. BackgroundGeotechnology has been couched as one of the three "mega-technologies" of the 21 st century, along with nanotechnology and biotechnology (Gewin, 2004). On the cusp of the second decade of the 21 st century it is evident that recent developments in the geotechnologies of Geographic Information Science (GIS) and remote sensing have had a substantial impact on ecological research, providing spatial data and associated information to enable the further understanding of ecological systems (Rundell et al., 2009). In a digital society there is sometimes an expectation that information is just a click away and this may apply to spatial information in the domain of ecological informatics. Indeed, it has been in the last five years that developments in and relating to the fields of GIS and remote sensing, such as those seen in internet technologies (e.g., Web 2.0; high performance communication networks; Brunt et al., 2007), sensing technology (e.g., quantum well infrared photodetectors; Krabach, 2000), data standards and interoperability (e.g., OGC® KML 2.2) and spatially explicit modeling (e.g., Osborne et al., 2007), have resulted in the revelation of previously unobservable phenomena and posing of what might be termed second generation of ecological questions. During this time we have also seen more support for the open exchange of data and software and infrastructure for location based services. This paper serves as a review of some of the recent developments in GIS and remote sensing that have been or promises to be of benefit to ecological informatics. The subjects addressed are necessarily selective and limited in scope, drawing on topics of interest to us and, we hope, to you.

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Deforestation in Central Africa: Estimates at regional, national and landscape levels by advanced processing of systematically-distributed Landsat extracts

Cited by 227 publications

References 19 publications

Land use and its impacts on the water quality of the Cachoeirinha Invernada Watershed, Guarulhos (SP)

Land use and its impacts on the water quality of the Cachoeirinha Invernada Watershed, Guarulhos (SP)

Analysis of deforestation patterns in the central Menabe, Madagascar, between 1973 and 2010

An overview of recent remote sensing and GIS based research in ecological informatics

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