Michel Chaves

National Institute for Space Research, Brazil | inpe · Remote Sensing Division

Advances in satellite imagery and remote sensing have enabled the acquisition of spatial data at several different resolutions. Geographic information systems (GIS) and geostatistics can be used to link geographic data from different sources. This article discusses the need to improve soybean crop detection and yield prediction by linking census da...

Recent applications of Landsat 8 Operational Land Imager (L8/OLI) and Sentinel-2 MultiSpectral Instrument (S2/MSI) data for acquiring information about land use and land cover (LULC) provide a new perspective in remote sensing data analysis. Jointly, these sources permit researchers to improve operational classification and change detection, guidin...

The Brazilian Amazon rainforest deforestation rate increased by 34.1% between 2018 and 2019, reaching even protected areas, such as Indigenous Lands (ILs). In particular, Ituna/Itatá IL, in the state of Pará, restricted to the study of Igarapé Ipiaçava isolated indigenous people, has experienced a 654% deforestation rate increase during the same pe...

The agricultural frontier expansion in the Cerrado biome made Brazil a leader in commodity exports and is changing its landscape. Hence, efforts to accurate land use and land cover (LULC) monitoring in this region are strategic, due to its role in Brazil’s food, environmental, and economic security policy. Thinking on planning and technical soverei...

Recently, remote sensing image time series analysis has being widely used to investigate the dynamics of environments over time. Many studies have combined image time series analysis with machine learning methods to improve land use and cover change mapping. In order to support image time series analysis, analysis-ready data (ARD) image collections...

Land use and land cover (LULC) mapping initiatives are essential to support decision making related to the implementation of different policies. There is a need for timely and accurate LULC maps. However, building them is challenging. LULC changes affect natural areas and local biodiversity. When they cause landscape fragmentation, the mapping and...

Since 2012, deforestation rates have been increasing within the Brazilian Amazon. This situation undermines the mitigation efforts against global climate change and stresses our need for both accurate identification of deforestation hotspots and promotion of law enforcement. It also implies a permanent need to explore the deforestation data, lookin...

Land Use and Land Cover changes (LULCC) are considered the main drivers that modify the natural environment. Thus, understanding the structure of a landscape, the anthropic actions that affect it, and proposing planning strategies are essential tools for sustainable development. In this context, this work aimed to propose territorial planning for B...

Conserving tropical forests is crucial for the environment and future of our climate. Tropical rainforests worldwide, including the Brazilian Legal Amazon (BLA), offer exceptional ecosystem services. However, the disturbances that have been occurring more frequently within them are endangering their key role in tackling climate change. An alternati...

The Brazilian Savanna presents a complex agricultural dynamic and cloud cover issues; therefore, there is a need for new strategies for more detailed agricultural monitoring. Using a hierarchical classification system, we explored the Harmonized Landsat Sentinel-2 (HLS) dataset to detect soybean in western Bahia, Brazil. Multispectral bands (MS) an...

While Brazil publicly committed to reduce deforestation in Amazonia at the 26th Conference of the Parties (COP26), the Brazilian parliament is moving toward weakening environmental laws. Deforestation rates continue ascending, reaching in 2021 the highest value since 2006 (13,235 km2). To overcome this paradox, strategies to curb deforestation are...

Urban green spaces (UGS) positively impact the population, providing essential ecosystem services and improving public health. Urban vegetation management needs to optimize mowing process costs and reducing impacts on the natural ecosystem. Thus, we implemented a general grass growth model suitable for UGS management in tropical areas, focused on l...

Fire foci in the Cerrado and Caatinga of Minas Gerais identified by orbital sensor ABSTRACT In Brazil, fires are associated with agricultural expansion and the management of pastures for livestock, causing socio-environmental impacts, even in natural protected areas. This study evaluated the spatio-temporal distribution of the fire foci detected by...

Degradation in natural areas protected by Law has increased in recent years. Therefore, it is necessary to develop strategies to monitor the space and generate subsidies for prompt inspection. Annual systematic mapping can fulfill this mission, however, in regions whose land use is heterogeneous, phytophysiognomies of natural non-forest vegetation...

Methods for crop phenology detection using time series analysis have provided accurate information for large agricultural areas in shorter processing times, which can be useful for agronomic management and supply chain monitoring. Given the crop dynamics in the Brazilian Cerrado, with alternating crop type plantings, crop successions, and crop rota...

In their comments about our paper, the authors remark on two issues regarding our results relating to the MACCS-ATCOR Joint Algorithm (MAJA). The first relates to the sub-optimal performance of this algorithm under the conditions of our tests, while the second corresponds to an error in our interpretation of MAJA’s bit mask. To answer the first iss...

The Brazilian Amazon is facing a deforestation boom with potentially new deforestation hotspots emerg-ing. We have identified one of these hotspots at the margins of the BR-319, where bidding notices forpaving this highway were recently announced in spite of having legal permission for it. Approximately90% of the direct influence zone of this highw...

Although the current Amazon large-scale deforestation boom is not identified in other Brazilian biomes, local areas of the Cerrado are showing increasing deforestation. We have assessed the historical deforestation patterns focusing on the 2018–2019 biennium in two Protected Areas (PAs) of the Cerrado (Rio Preto and Bacia do Rio de Janeiro) where t...

Given the importance and fragility of natural resources, the concern with the disorderly human intervention on the environment has become recurrent, and different approaches for space occupation are being implemented. However, perception and detection of spatial changes are often empirical due to the lack of information. Thus, the best possible inf...

The objective of this work was to detect land use and land cover changes in the municipality of Rondon do Pará, in the Brazilian Legal Amazon, through the Geographic Object-based Image Analysis (GEOBIA), aiming to identify whether its inclusion in the list of priority municipalities for actions to prevent, monitor and control deforestation in the A...

Over the decades, hydropower complexes have been built in several hydrographic basinsof Brazil including the Amazon region. Therefore, it is important to understand the effects of theseconstructions on the environment and local communities. This work presents a land use and landcover change temporal analysis considering a 33-year period (1985–2018)...

Deforestation is a threat to biodiversity and the world’s climate. As agriculture and mining areas grow, forest loss becomes unbearable for the environment. Consequently, monitoring deforestation is crucial for decision makers to create polices. The most reliable deforestation data about the Amazon forest is generated by the Brazil’s National Insti...

Currently, the overwhelming amount of Earth Observation data demands new solutions regarding processing and storage. To reduce the amount of time spent in searching, downloading and pre-processing data, the remote Sensing community is coming to an agreement on the minimum amount of corrections satellite images must convey in order to reach the broa...

The conversion from primary forest to agriculture drives widespread changes that have the potential to modify the hydroclimatology of the Xingu River Basin. Moreover, climate impacts over eastern Amazonia have been strongly related to pasture and soybean expansion. This study carries out a remote-sensing, spatial-temporal approach to analyze inter-...

Deforestation in the Brazilian Amazon is related to the use of fire to remove natural vegetation and install crop cultures or pastures. In this study, we evaluated the relation between deforestation, land-use and land-cover (LULC) drivers and fire emissions in the Apyterewa Indigenous Land, Eastern Brazilian Amazon. In addition to the official Braz...

Tropical forests regulate the global water and carbon cycles and also host most of the world's biodiversity. Despite their importance, they are hard to survey due to their location, extent, and particularly, their cloud coverage. Clouds hinder the spatial and radiometric correction of satellite imagery and also diminishing the useful area on each i...

Permanent Protection Areas (PPAs) play an important role in the ecosystem functioning. For this reason, this study aims at mapping land use in the PPAs of the São Tomé and Machado rivers, southern Minas Gerais. To perform this study, orbital imagery collected by the IRS-LISS III sensor onboard the ResourceSat 2 satellite were used. Five LULC classe...

A ação do fogo no Cerrado e na Caatinga de Minas Gerais desencadeia impactos socioambientais, inclusive, em áreas naturais protegidas por leis. Avaliou-se neste estudo a distribuição espacial dos focos de calor detectados pelos produtos de fogo derivados do sensor Moderate Resolution Imaging Spectroradiometer (MODIS) no Cerrado e na Caatinga de Min...

No Brasil, Unidades de proteção integral encontram-se vulneráveis devido a alterações em seu ecossistema. Em alguns casos, a extensão territorial limita o monitoramento ambiental. Logo, satélites que fornecem dados contínuos sobre a superfície terrestre podem auxiliar no processo. Objetivou-se com este trabalho avaliar o uso e cobertura da terra no...

Avaliar a variação temporal da precipitação pluvial é essencial para o planejamento sustentável dos agroecossistemas. Objetivou-se neste trabalho, comparar dados orbitais em relação aos dados in situ de precipitação, no município de Lavras –MG, no intervalo de 01/01/2000 a 31/06/2017. A série histórica dos dados orbitais foi obtida do produto 3B43...

O monitoramento climático é um elemento essencial para predições nas mudanças de temperatura e a sua influência na segurança e saúde ambiental. No entanto, a esparsa densidade de estações meteorológicas limita a obtenção de dados confiáveis e dificulta as análises a respeito de variáveis e eventos climáticos, tornando necessário o uso de estimadore...

Os índices de vegetação auxiliam no monitoramento de culturas. Porém, séries temporais destes índices estão sujeitas a ruídos que alteram o real valor do pixel. Diante disso, objetivou-se analisar a aplicabilidade da filtragem Savitzky-Golay (SG) em séries temporais Enhanced Vegetation Index (EVI) para analisar a cultura da soja em Campo Verde (MT)...

The objective of this study was to obtain the bathymetry of dam of Funil /MG by the difference of altitudes from orbital data. The methodology was divided into 3 stages: delimitation of the flooded area by the k-means Classification algorithm in LANDSAT 8 OLI; difference of altitude images in the years 2000 and 2011, coming from the SRTM radar and...

The objective of this work was to perform predictions of the NDVI values to determine the phenological profile of a coffee crop using Landsat 7 and 8 images. The study was conducted in a coffee plantation in the southern state of Minas Gerais. We used the Climate Engine virtual library to collect NDVI data, generating a temporal profile with and wi...

The aim of this work was to evaluate the dynamics of the burning process and its effective control within the Environment Preservation Area (EPA) of Pandeiros, northern region of Minas Gerais state. An automatic detection algorithm was developed in LEGAL / SPRING environment, capable of: Perform an overlay analysis between the image data of diagnos...

The intensive and dynamic land-use and land-cover changes in Mato Grosso, Brazil, and the environmental costs of adopted agricultural practices over the years have attracted the attention of researchers and institutions. In order to evaluate these aspects, moderate resolution remote sensing data and techniques have been applied. Using the Moderate...

In the last decades, remote sensing application in agricultural research has intensified to evaluate phenological cycles. Vegetation indices time series have been used to obtain information about the seasonal development of agricultural vegetation on a large scale. The multitemporal approach increases the gain of information coming from orbital ima...

The objective of this work was to perform a multitemporal analysis of the land-use in the city of Extrema (MG) using Remote Sensing (SR) and the Geospatial Object Based Image Analysis (GEOBIA) approach, considering the beginning of the environmental conservation programs of voluntary accession present in the municipality and the current period, foc...

O presente trabalho tem como objetivo a aplicação de técnicas de cartografia geoambiental em ambiente SIG para o mapeamento e identificação da aptidão territorial do município de Pirassununga em viabilizar e implementar atividades Ecoturísticas, analisando também, a situação atual dos serviços ecossistêmicos culturais na área em estudo. Como propos...

O monitoramento climático é elemento essencial para predições nas mudanças da temperatura e a sua influência na segurança e saúde ambiental. No entanto, a esparsa densidade de estações meteorológicas limita a obtenção de dados e dificulta as análises a respeito de variáveis e eventos climáticos, tornando necessário o uso de estimadores de dados par...

No Brasil, as queimadas e os incêndios florestais estão ligadas à expansão agrícola e ao manejo de pastagens, mas também podem ser causadas por processos naturais. Estas mudanças desencadeiam impactos ambientais e socioambientais, afetando, inclusive, áreas naturais protegidas por leis. Diante disso, avaliou-se neste estudo a distribuição espacial...

O monitoramento climático é elemento essencial para predições nas mudanças da temperatura e a sua influência na segurança e saúde ambiental. No entanto, a esparsa densidade de estações meteorológicas limita a obtenção de dados e dificulta as análises a respeito de variáveis e eventos climáticos, tornando necessário o uso de estimadores de dados par...

Neste trabalho foi realizado um levantamento acerca da cobertura vegetal do solo em uma pequena propriedade rural no município de Lagoa Dourada- MG, com a finalidade de observar a redução nas áreas de vegetação nativa mediante a expansão agrícola e pastoril. Desse modo, foram utilizadas imagens Landsat 8 OLI/TIRS, com resolução espacial de 30 metro...

No cenário atual de aumento da consciência ambiental e procura por meios de proteger o meio ambiente, a preservação das águas, tanto a superficial quanto a subterrânea, tem ganhado destaque tanto nos meios de informação quanto na ciência. Esta pesquisa teve como objetivo gerar uma carta de potencial de contaminação de aquíferos da bacia hidrográfic...

Vegetation is one of the most important components of ecosystems, attracting attention and interest of the scientific community due to its undergoing constant transformation. The remote sensing systems provide data to detect, identify, map and monitor these changes. This study aimed at (1) evaluating the effectiveness of the BFAST algorithm to char...

The objective of this work was to propose the “object-oriented classification” as a viable tool for territorial planning and management in watersheds. The study area chosen was the Clarinho River Basin, one of the main tributaries of the Claro River, located in Santa Rita do Passa Quatro, São Paulo, Brazil. This is an area of interest because of th...

Information derived from remote sensing can be extremely useful for crop monitoring during the phenological cycle, and is relevant for strategic planning of large-scale agriculture. Among the outstanding sensors used with this purpose, the Moderate Resolution Imaging Spectroradiometer (MODIS), which is aboard the TERRA and AQUA satellites, is the m...

Brown eye spot, caused by Cercospora coffeicola is one of the oldest diseases related to coffee trees. It is estimated that an infected cultivation can lose up to 30% of its productivity. In this context, remote sensoring techniques can be useful to help the farmer to the management the coffee culture. The objective of this study was to analyze the...

The State of Mato Grosso is characterized by soybean cultivation in summer seasons. As the agricultural sector has an important participation in economy, the implementation of monitoring and systematic mapping tools is important for the strategic planning. Facing this demand, the connection of field data, orbital data and geostatistical techniques...

The sustainable management and conservation are key elements to ensure the conditions for life on Earth. Several researchers seeking alternatives that mitigate the anthropic activities on land resources. The advance of spacial research facilitated the access to images produced by satellites to detect changes in vegetation. The vegetation indexes, f...

Fires reach most of vegetated land surface of the planet and are an important variable in local and regional climate, due to transport of emissions associated with this phenomenon, as well as an important source of land use and land cover changes. For a long time, fires study were performed using small scale combustion experiments and field measure...

Understanding the behavior of vegetation is a complex activity, however, remote sensing is helping to facilitate the analysis, supporting and providing data about the vegetation. The present study aims to conduct a comparative analysis between three ways to calculate the Normalized Difference Vegetation Index (NDVI), using the original digital numb...

RESUMO Conhecer a declividade de uma região é importante para estudos geológicos e geomorfológicos que visem encontrar regiões pouco acidentadas, identificar potencialidade de uso agrícola de uma determinada área, potencialidade de mecanização agrícola, bem como possibilitar inferências sobre susceptibilidade dos solos à erosão, dentre outras aplic...

RESUMO As Áreas de Preservação Permanente (APP), sobretudo, são bens de interesse social nacional, além de espaços protegidos com a função ambiental de preservar os recursos naturais e assegurar o bem-estar. Os Sistemas de Informações Geográficas (SIG) são ferramentas úteis, apresentando recursos para a modelagem numérica precisa das APP. Neste con...

RESUMO: O Estado de Minas Gerais se destaca na produção agrícola do Brasil, e o município de Campos Gerais e sua microrregião, desempenham um papel importante na produção de café e cereais, como o milho. A mecanização agrícola de modo geral aumenta consideravelmente a capacidade produtiva da mão-de-obra rural, proporcionando que um homem operando u...

RESUMO: Possuindo mais de um milhão de hectares plantados, o Estado de Minas Gerais é o maior produtor nacional de café, responsável por cerca de 50% da safra brasileira. A região sul se sobressai pela alta produtividade e grande produção de cafés especiais, diferenciados pela sua qualidade, bebida e sabor. Aspectos como o clima, o solo, a altitude...

RESUMO A proteção de áreas de preservação permanente (APP) próximas a cursos d'água é regulamentada pela legislação brasileira e vital à manutenção da biodiversidade local. Entretanto, a ação antrópica desordenada gera conflitos de uso do solo, reduzindo a vegetação natural e afetando a qualidade da água. O presente trabalho avalia a situação da ár...

RESUMO: As geotecnologias são úteis para o estudo da vegetação, oferecendo um conjunto de técnicas eficazes para compreender sua dinâmica. Entre as técnicas para o processamento de imagens de satélite utilizadas no estudo da vegetação, os índices de vegetação são usados constantemente, a fim de destacar a atividade fotossintética, detecção de mudan...

RESUMO: Análises da cobertura vegetal e do uso da terra são realizadas para investigar e monitorar a qualidade dos atributos do solo e principalmente da vegetação. Utilizam-se imagens de satélite de uma mesma área em diferentes épocas e o NDVI (Normalized Difference Vegetation Index) a fim de evidenciar a atividade fotossintética e as mudanças em d...