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Registros recuperados: 35
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A comparative study of landsat TM and SPOT HRG images of vegetation classification in the brazilian Amazon. Repositório Alice
LU, D.; BATISTELLA, M.; MIRANDA, E. E. de.
Complex forest structure and abundant tree species in the moist tropical regions often couse difficulties in classifying vegetation classes with remotely sensed data. This paper explores improvement in vegetation classification accuracies through a comparative study of different image combinations based on the integration of Landsat Thematic Mapper (TM) and SPOT High Resolution Geometric (HRG) instrument data, as well as the combination of spectral signatures and textures. A maximum likelihood classifier was used to classify the different image combinations into thematic maps. This research indicated that data fusion based on HBG multispectral and panchromatic data slightly improved vegetation classification accuracies: a 3.1 to 4.6 percent increase in the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Comparative study; Landsat TM and SPOT HRG Images; Brazilian Amazon; Moist tropical regions; Machadinho d´Oeste.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/31577
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Aggregation, carbon, and total soil nitrogen in crop-livestock-forest integration in the Eastern Amazon AGRIAMBI
Silva,Jéssica C. N.; Silva,Arystides R.; Veloso,Carlos A. C.; Dantas,Edilândia F.; Sacramento,José A. A. S. do.
ABSTRACT Sustainable agricultural production systems can improve physical attributes of soil as well as increase carbon and nitrogen stocks in soils. The objective of this study was to evaluate changes in the stability of soil aggregates and contents and stocks of carbon and nitrogen after the conversion of native forest to crop-livestock-forest integration systems in the region of Western Pará. Soil samples from five management systems (including a control) were collected at three depths in a randomized block design, with five replications. The stability of the aggregates, soil density, particle density, and total soil porosity, as well as total carbon and nitrogen and their respective stocks were evaluated. The native forest had the highest percentages...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic carbon; Soil physics; Sustainability; Brazilian Amazon.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200837
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Clinical aspects of envenomation caused byTityus obscurus (Gervais, 1843) in two distinct regions of Pará state, Brazilian Amazon basin: a prospective case series J. Venom. Anim. Toxins incl. Trop. Dis.
Pardal,Pedro PO; Ishikawa,Edna AY; Vieira,José LF; Coelho,Johne S; Dórea,Regina CC; Abati,Paulo AM; Quiroga,Mariana MM; Chalkidis,Hipócrates M.
Background:Scorpion envenomations are a major public health problem in Brazil, whose most dangerous cases are attributable to the genus Tityus.This study was designed to compare the clinical and demographic features of envenomations by 77tyus obscurus in two areas of the state of Pará located in the Amazon basin. Were compared demographic findings, local and systemic signs and symptoms of human envenomations caused byT. obscurus that occurred in western and eastern areas of the state.Results:Forty-eight patients with confirmed envenomation by T. obscurus were evaluated from January 2008 to July 2011. Most of them came from the eastern region, where male and female patients were present in similar numbers, while males predominated in the west. Median age...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scorpionism; Tityus obscurus; Envenoming; Neurological symptoms; Brazilian Amazon.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992014000200321
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Collaborative Monitoring of Production and Costs of Timber Harvest Operations in the Brazilian Amazon Ecology and Society
Pokorny, Benno; University of Freiburg; benno.pokorny@waldbau.uni-freiburg.de.
Timber companies and policy makers in the Brazilian Amazon urgently need financial information on forest management. Results from a few experiments, case studies, and surveys have been groundbreaking, but are insufficient. A strategic partnership between timber companies and research organizations is needed to generate additional information. This paper presents a tool for monitoring production and costs of forest operations to facilitate such collaboration. The tool provides useful information for companies and, at the same time, generates reliable data for research. Selected results are presented on production, capacity, and costs to demonstrate the usefulness of the information that can be generated. These results are based on the first 2 years of...
Tipo: Peer-Reviewed Reports Palavras-chave: Brazilian Amazon; Costs; Forest operations; Monitoring; Productivity; Reduced-impact logging.
Ano: 2005
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Colletotrichum spp.: um patógeno limitante à agricultura na Amazônia brasileira. Repositório Alice
SIVIERO, A.; GASPAROTTO, L..
Nos últimos anos observou-se na Amazônia brasileira um aumento notável de doenças de plantas causadas por espécies do Gênero Colletotrichum, a maioria conhecida como Antracnoses. Medidas de controle deste patógeno são de difícil adoção e antieconômicas para a maioria dos agricultores desta região.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Amazônia brasileira; Brazilian Amazon; Amazonia brasileña; Doença de planta; Antracnose; Colletotrichum spp; Plant diseases and disorders; Anthracnose; Enfermedades y desórdenes de las plantas; Antracnosis.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/492139
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Composition and structure of the fig wasp community in Amazonia Acta Amazonica
CASTRO,Raquel Ribeiro de Souza; REZENDE,Alinne Costa Cavalcante; ROQUE,Rosemary Aparecida; JUSTINIANO,Silvia Cassia Brandão; SANTOS,Otilene dos Anjos.
An understanding of the complex ecological interaction between fig wasps and their host plants in Amazonia requires previous knowledge of their distribution and diversity. The objective of this study was to describe the composition and structure of the wasp community associated with four species of Ficus in the municipal area of Manaus, Amazonas, Brazil. A total of 600 syconia from four species were collected. The study species were: Ficus obtusifolia Kunth; Ficus citrifolia Mill; F. americana subspecies guianensis Desv. form mathewsii; and F. americana subspecies guianensis Desv. form parkeriana. Statistical analyses were used to examine the relationship between fig wasp diversity and syconium diameter, and the effect of non-pollinating wasps on numbers...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Figs; Diversity; Brazilian Amazon.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000400355
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Considerações limnológicas sobre um lago da planície de inundação amazônica (lago Catalão – Estado do Amazonas, Brasil) - DOI: 10.4025/actascibiolsci.v31i4.4641 Biological Sciences
Almeida, Fabiane Ferreira de; Instituto Nacional de Pesquisas da Amazônia - Programa de Pós-Graduação em Biologia de Água Doce e Pesca Interior; Melo, Sérgio; Instituto Nacional de Pesquisas da Amazônia.
Este estudo aborda a variação temporal (sazonal, semanal e nictemeral) e espacial de algumas variáveis limnológicas na região limnética do lago Catalão, um lago da planície de inundação do rio Amazonas. Foram analisados os valores de temperatura, zona eufótica, zona de mistura, condutividade elétrica, oxigênio dissolvido, transparência, nitrogênio e fósforo total, amostrados em quatro estações, em escala semanal, durante um mês no período de seca de 2006 e um mês no período de cheia de 2007. Regressões simples foram realizadas para testar a hipótese da homogeneização de ambientes aquáticos em função da inundação. Foram analisados, também, os valores de temperatura, oxigênio dissolvido e condutividade elétrica em um perfil vertical ao longo de um ciclo...
Palavras-chave: 2.05.02.00-1 variáveis limnológicas; Variação nictemeral; Planície de inundação; Variação sazonal; Pulso de inundação; Amazônia Brasileira Ecologia de Ecossistemas (Limnologia) limnological variables; Diel variation; Flood plain lake; Seasonal variation; Flood pulse; Brazilian Amazon.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/4641
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Cytogenetic damage related to low levels of methyl mercury contamination in the Brazilian Amazon Anais da ABC (AABC)
AMORIM,MARÚCIA I. M.; MERGLER,DONNA; BAHIA,MARCELO O.; DUBEAU,HÉLÈNE; MIRANDA,DANIELA; LEBEL,JEAN; BURBANO,ROMMEL R.; LUCOTTE,MARC.
The mercury rejected in the water system, from mining operations and lixiviation of soils after deforestation, is considered to be the main contributors to the contamination of the ecosystem in the Amazon Basin. The objectives of the present study were to examine cytogenetic functions in peripheral lymphocytes within a population living on the banks of the Tapajós River with respect to methylmercury (MeHg) contamination, using hair mercury as a biological indicator of exposure. Our investigation shows a clear relation between methylmercury contamination and cytogenetic damage in lymphocytes at levels well below 50 micrograms/gram, the level at which initial clinical signs and symptoms of mercury poisoning occur. The first apparent biological effect with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazilian Amazon; Mercury; Mitotic Index; Cytogenetics.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400004
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Cytogenetics of the Brazilian Bolitoglossa paraensis (Unterstein, 1930) salamanders (Caudata, Plethodontidae) Genet. Mol. Biol.
Silva,Jéssica Barata da; Suárez,Pablo; Nagamachi,Cleusa Yoshiko; Carter,Timothy Frederick; Pieczarka,Julio Cesar.
Plethodontid salamanders of genus Bolitoglossa constitute the largest and most diverse group of salamanders, including around 20% of living caudate species. Recent studies have indicated the occurrence of five recognized species in the Brazilian Amazon Rainforest. We present here the first cytogenetic data of a Brazilian salamander, which may prove to be a useful by contribution to the cytotaxonomy of the genus. Specimens were collected near the "type" locality (Utinga, Belém, PA, Brazil). Chromosomal preparations from duodenal epithelial cells and testes were subjected to Giemsa staining, C-banding and DAPI/CMA3 fluorochrome staining. All specimens showed a karyotype with 13 bi-armed chromosome pairs (2n = 26). Nucleolar Organizer Regions, evidenced by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Salamanders; Bolitoglossa; Karyotypes; Brazilian Amazon; Cytogenetics.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000400008
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DETERMINANTS OF TECHNICAL EFFICIENCY IN AGRICULTURE AND CATTLE RANCHING: A SPATIAL ANALYSIS FOR THE BRAZILIAN AMAZON AgEcon
Igliori, Danilo Camargo.
The determinants of technical efficiency in agriculture and cattle ranching are closely related with the debate involving the conservation-development trade-off in the Brazilian Amazon. Concerned with balancing development and environmental conservation, policy makers and academics have emphasized the importance of choosing ways of selecting areas where land use restrictions would be established. In order to understand the relationship between spatial patterns of deforestation and the associated distribution and characteristics of economic activity, issues regarding technical efficiency are clearly important. This paper aims to identify the socio-economic and environmental determinants of technical efficiency in agriculture and cattle ranching in the...
Tipo: Working or Discussion Paper Palavras-chave: Stochastic frontier; Technical efficiency; Spatial analysis; Brazilian Amazon; Livestock Production/Industries; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies.
Ano: 2005 URL: http://purl.umn.edu/31927
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Doenças causadas por Colletotrichum spp. na Amazônia brasileira. Repositório Alice
SIVIERO, A.; GASPAROTTO, L.; LIMA, M. I. P. M..
Nos últimos anos observou-se ma Amazônia brasileira um aumento notável de plantas causadas por espécies do gênero Colletotrichum.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Amazônia brasileira; Brazilian Amazon; Amazonia brasileña; Doença de planta; Antracnose; Colletotrichum spp; Plant diseases and disorders; Anthracnose; Enfermedades y desórdenes de las plantas; Antracnosis.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/handle/doc/492155
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Emerging acute Chagas Disease in Amazonian Brazil: case reports with serious cardiac involvement BJID
Pinto,Ana Yecê das Neves; Valente,Sebastião Aldo da Silva; Valente,Vera da Costa.
Four cases of serious cardiac attacks by autochthonous Trypanosoma cruzi infection from the Brazilian Amazon are reported; three of them occurred in micro-epidemic episodes. The manifestations included sudden fever, myalgia, dyspnea and signs of heart failure. Diagnosis was confirmed by specific exams, especially QBC (Quantitative Buffy Coat) and natural xenodiagnosis. Despite treatment with benznidazol, three patients died with serious myocarditis, renal failure and cardiac tamponade. The authors call attention to the emergence of this disease and reveal a previously unknown pathogenicity of T. cruzi strains in this area, added to a non-usual transmission form.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Chagas disease; Trypanosomiasis; Cardiovascular; Brazilian Amazon; Myocarditis.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702004000600010
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Envenomation caused by Rhopalurus amazonicus Lourenço, 1986 (Scorpiones, Buthidae) in Pará State, Brazil J. Venom. Anim. Toxins incl. Trop. Dis.
Fuentes-Silva,Deyanira; Santos Jr,Alfredo P; Oliveira,Joacir Stolarz.
Scorpions, mainly those belonging to the genus Tityus cause many deaths and injuries in Brazil, with tens of thousands of envenomations notified every year. However, injuries involving other scorpion species are scarcely registered. Among the sixteen species of the genus Rhopalurus, Thorell, 1876, described up to date, nine are found in this country, with only a confirmed case of human envenomation provoked by R. agamemnonKoch, 1839. The present case reports, for the first time, a case of scorpion sting in a human victim involving Rhopalurus amazonicus, endemic species of the west region of the Pará state, Amazon, Brazil. The symptoms of envenomation were local pain and paresthesia. This study contributes to develop the knowledge on venomous scorpions,...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Scorpion sting; Rhopalurus amazonicus; Venomous animals; Envenomation; Brazilian Amazon; Pará.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992014000200509
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Evidence of two lineages of the dengue vector Aedes aegypti in the Brazilian Amazon, based on mitochondrial DNA ND4 gene sequences Genet. Mol. Biol.
Lima Júnior,Raimundo Sousa; Scarpassa,Vera Margarete.
Genetic variation was estimated in ten samples populations of Aedes aegypti from the Brazilian Amazon, by using a 380 bp fragment of the mitochocondrial NADH dehydrogenase subunit 4 (ND4) gene. A total of 123 individuals were analyzed, whereby 13 haplotypes were found. Mean genetic diversity was slightly high (h = 0.666 ± 0.029; π = 0.0115 ± 0.0010). Two AMOVA analyses indicated that most of the variation (~70%-72%) occurred within populations. The variation found among and between populations within the groups disclosed lower, but even so, highly significant values. F ST values were not significant in most of the comparisons, except for the samples from Pacaraima and Rio Branco. The isolation by distance (IBD) model was not significant (r = 0.2880; p =...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aedes aegypti; Dengue vector; Genetic structure; Gene flow; Brazilian Amazon; Genetic lineages.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200032
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Fertilization and cover crop effects on soil nitrogen and plant nutrition in a young guarana plantation Acta Amazonica
Trujillo,Lucerina; Lehmann,Johannes; Cravo,Manoel da Silva; Atroch,André Luiz; Nascimento Filho,Firmino José do.
Fruit tree production is gaining an increasing importance in the central Amazon and elsewhere in the humid tropics, but very little is known about the nutrient dynamics in the soil-plant system. The present study quantified the effects of fertilization and cover cropping with a legume (Pueraria phaseoloides (Roxb.) Benth.) on soil nitrogen (N) dynamics and plant nutrition in a young guarana plantation (Paullinia cupana Kunth. (H.B. and K.) var. sorbilis (Mart.) Ducke) on a highly weathered Xanthic Ferralsol. Large subsoil nitrate (NO3-) accumulation at 0.3-3 m below the guarana plantation indicated N leaching from the topsoil. The NO3- contents to a depth of 2 m were 2.4 times greater between the trees than underneath unfertilized trees (P<0.05). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acid tropical soil; Cover crop; Brazilian Amazon; Fruit tree; Nitrogen leaching.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000400001
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First record of Thaumastocoris peregrinus (Hemiptera, Thaumastocoridae) in Pará state, Brazil Acta Amazonica
SALIBA,Ivy Laura; LUNZ,Alexandre Mehl; BATISTA,Telma Fátima; SCHWARTZ,Gustavo.
ABSTRACT Thaumastocoris peregrinus (Hemiptera, Thaumastocoridae) is a phytophagous pest of eucalyptus plantations. It was introduced in Brazil in 2008, and expanded rapidly due to its adaptive capacity to different climatic conditions. Eucalyptus has been planted in the Brazilian Amazon since the 1980s, being used in silvopastoral systems and for cellulose production. Since its introduction in the southernmost Brazilian state of Rio Grande do Sul, T. peregrinus has expanded its geographical distribution to 117 municipalities in states in the south (Rio Grande do Sul, Santa Catarina and Paraná), southeast (São Paulo, Espirito Santo, Rio de Janeiro and Minas Gerais), mid-west (Mato Grosso do Sul and Goiás) and northeast (Sergipe) of the country. Here we...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Insect pest; Bronze bug; Occurrence; Eucalyptus; Brazilian Amazon.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000300179
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Frequencies of CCR5-D32, CCR2-64I and SDF1-3’A mutations in Human Immunodeficiency Virus (HIV) seropositive subjects and seronegative individuals from the state of Pará in Brazilian Amazonia Genet. Mol. Biol.
Carvalhaes,Fernanda Andreza de Pinho Lott; Cardoso,Greice Lemos; Vallinoto,Antonio Carlos Rosário; Machado,Luiz Fernando; Ishak,Marluisa de Oliveira Guimarães; Ishak,Ricardo; Guerreiro,João Farias.
The distribution of genetic polymorphisms of chemokine receptors CCR5-delta32, CCR2-64I and chemokine (SDF1-3’A) mutations were studied in 110 Human Immunodeficiency Virus type 1 (HIV-1) seropositive individuals (seropositive group) and 139 seronegative individuals (seronegative group) from the population of the northern Brazilian city of Belém which is the capital of the state of Pará in the Brazilian Amazon. The CCR5-delta32 mutation was found in the two groups at similar frequencies, i.e. 2.2% for the seronegative group and 2.7% for the seropositive group. The frequencies of the SDF1-3’A mutation were 21.0% for the seronegative group and 15.4% for the seropositive group, and the CCR2-64I allele was found at frequencies of 12.5% for the seronegative...
Tipo: Info:eu-repo/semantics/other Palavras-chave: CCR5; CCR2; SDF-1; HIV-1 infection; Allele frequency; Brazilian Amazon.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500004
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High-risk human papillomavirus and cervical lesions among women living with HIV/AIDS in Brazilian Amazon, Brazil BJID
Silva,Leila da; Miranda,Angélica; Batalha,Rosieny; Ferreira,Luiz; Santos,Mayara; Talhari,Sinésio.
ABSTRACT OBJECTIVE: The goal of this study was to determine the prevalence of human papillomavirus infection infection and cervical lesions and its associated factors among HIV infected women attending an AIDS clinic in Amazonas state, Brazil. METHODS: Cross-sectional study. Women attending an AIDS clinic in the city of Manaus between March and December 2011 for gynecological examination were invited to participate. Enrolled patients answered a standardized interview including demographical, behavioral, and clinical data. Additionally, patients underwent a gynecological evaluation with collection of cervical samples for cytological analysis and high-risk human papillomavirus infection hybrid capture. A blood sample was also obtained to determine CD4...
Tipo: Info:eu-repo/semantics/article Palavras-chave: HPV; HIV; Cervical cancer; Brazilian Amazon.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702015000600557
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Integrating Ecosystem Management, Protected Areas, and Mammal Conservation in the Brazilian Amazon Ecology and Society
Azevedo-Ramos, Claudia; IPAM-Amazon Institute of Environmental Research; c.azevedoramos@terra.com.br; do Amaral, Benedito Domingues; IPAM-Amazon Institute of Environmental Research; beneditoamaral@ipam.org.br; Nepstad, Daniel C.; The Woods Hole Research Center; dnepstad@whrc.org; Soares Filho, Britaldo; Universidade Federal de Minas Gerais; britaldo@csr.ufmg.br; Nasi, Robert; Center of International Forestry Research; r.nasi@cgiar.org.
Tipo: Peer-Reviewed Reports Palavras-chave: Biodiversity conservation; Brazilian Amazon; Distribution ranges; Mammal species; Protected areas..
Ano: 2006
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Integration of landsat TM and SPOT HRG Images for vegetation change detection in the Brazilian Amazon. Repositório Alice
LU, D.; BATISTELLA, M.; MORAN, E..
Traditional change detection approaches have been proven to be difficult in detecting vegetation changes in the moist tropical regions with multitemporal images. This paper explores the integration of Landsat Thematic Mapper (TM) and SPOT High Resolution Geometric (HRG) instrument data for vegetation change detection in the Brazilian Amazon. A principal component analysis was used to integrate TM and HRG panchromatic data. Vegetation change/non-change was detected with the image differencing approach based on the TM and HRG fused image and the corresponding TM and HRG multispectral images into thematic maps with three coarse land-cover classes: forest, non-forest vegetation, and non-vegetation lands. A hybrid approach combining image differencing and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Brazilian Amazon; Image collection and preprocessing; Vegetation Chance Detection.
Ano: 2008 URL: http://www.alice.cnptia.embrapa.br/handle/doc/31571
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