scholarly journals Quantificação da perda de água por evapotranspiração em diferentes usos da terra da Bacia do Rio Vieira / Quantification of water loss by evapotranspiration in different land uses of the River Vieira Basin

2019 ◽  
Vol 29 (58) ◽  
pp. 746-764
Author(s):  
Marcos Esdras Leite ◽  
Maria Ivete Soares De Almeida ◽  
Lucas Augusto Pereira da Silva ◽  
Manoel Reinaldo Leite
Keyword(s):  
Remote Sensing ◽  
Deciduous Forest ◽  
Minas Gerais ◽  
Tropical Deciduous Forest ◽  
Winter Period ◽  
Native Vegetation ◽  
Land Uses ◽  
Grassland Soil ◽  
Sparse Vegetation ◽  
Remote Sensing Techniques

Este trabalho teve como objetivo quantificar a perda de água por evapotranspiração real diária em diferentes usos da terra na bacia do rio Vieira em Minas Gerais, por meio de técnicas de sensoriamento remoto para o período de 17/06/2016. Diante dos dados obtidos, pode-se analisar os usos da terra que perdem maior quantidade de água por evapotranspiração, sendo as áreas de vegetação nativa (com vegetação rala inserida), as grandes potencialidades para a perda de água por meio de evapotranspiração exceto as áreas de Floresta Tropical Caducifólia, devido as suas características fenológicas de perder parte de sua folhagem durante o inverno (período analisado neste estudo). As áreas de eucalipto (uso antropogênico) também entram na estatística de uso da terra que perde mais água por evapotranspiração.  Já as menores perdas são destinadas aos usos da terra de Pastagem, solo exposto, urbano e influência mineradora e pasto degradado.Palavras–chave: SEBAL, Usos da terra e Evapotranspiração Real Diária.Abstract The objective of this work was to quantify the loss of water by daily real evapotranspiration in different Land uses in the Vieira river basin in Minas Gerais, using remote sensing techniques for the period of 06/17/2016. Considering the obtained data, it is possible to analyze the land uses that lose more water by evapotranspiration, being the areas of native vegetation (with sparse vegetation inserted), the great potentialities for the loss of water through evapotranspiration except for the areas of tropical deciduous forest, which due to its phenological characteristics of losing part of its foliage during winter (period analyzed in this study). The areas of eucalyptus (anthropogenic use) also enter into the statistics of land use that loses more water by evapotranspiration.  Already the smaller losses are destined to the uses of the Land of, Grassland, soil exposed, urban and mining influence and degraded grass.Keywords: SEBAL, Land Uses and Daily Real Evapotranspiration.

scholarly journals O CLIMA URBANO DE FEIRA DE SANTANA –BA ATRAVÉS DA TEMPERATURA DA SUPERFÍCIE E DO ÍNDICE DE VEGETAÇÃO POR DIFERENÇA NORMALIZADA -NDVI

2018 ◽  
Vol 10 (3) ◽  
pp. 94-98
Author(s):  
Jovana Mariano Damasceno ◽  
Margarete Cristiane de Costa Trindade Amorim
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Surface Temperature ◽  
Vegetation Index ◽  
Thermal Structure ◽  
Urban Climate ◽  
Landsat 8 ◽  
Land Uses ◽  
Remote Sensing Techniques ◽  
Climate Studies

The use of remote sensing techniques for urban climate studies has advanced over recent years. In this sense, the objective of this study was to identify the influence exerted by the different land uses and coverages in the thermal structure of the urban surface in Feira de Santana-BA. For elaboration of the map of the surface temperature were used calculations for conversion of digital values of the image of Landsat 8 satellite to temperature in degrees Celsius (°C) in the software Idrisi. The vegetation mapping was prepared by the calculation of the vegetation index of normalized difference (NDVI), on the same software. Analyzing the results,itwas possible to perceive that the highestsurface temperature aredirectlyrelated to land use,and thatthe vegetation is fundamental to decrease those temperatures. Thereby, remotesensingtechniques are very useful for urban climate studies.

scholarly journals Assessment of Close-Range Remote Sensing Methods for DTM Estimation in a Lowland Deciduous Forest

2021 ◽  
Vol 13 (11) ◽  
pp. 2063
Author(s):  
Luka Jurjević ◽  
Mateo Gašparović ◽  
Xinlian Liang ◽  
Ivan Balenović
Keyword(s):  
Remote Sensing ◽  
Laser Scanning ◽  
Large Scale ◽  
Deciduous Forest ◽  
Information Source ◽  
Data Sources ◽  
Pedunculate Oak ◽  
Absolute Deviation ◽  
Close Range ◽  
Remote Sensing Techniques

Digital terrain models (DTMs) are important for a variety of applications in geosciences as a valuable information source in forest management planning, forest inventory, hydrology, etc. Despite their value, a DTM in a forest area is typically lower quality due to inaccessibility and limited data sources that can be used in the forest environment. In this paper, we assessed the accuracy of close-range remote sensing techniques for DTM data collection. In total, four data sources were examined, i.e., handheld personal laser scanning (PLShh, GeoSLAM Horizon), terrestrial laser scanning (TLS, FARO S70), unmanned aerial vehicle (UAV) photogrammetry (UAVimage), and UAV laser scanning (ULS, LS Nano M8). Data were collected within six sample plots located in a lowland pedunculate oak forest. The reference data were of the highest quality available, i.e., total station measurements. After normality and outliers testing, both robust and non-robust statistics were calculated for all close-range remote sensing data sources. The results indicate that close-range remote sensing techniques are capable of achieving higher accuracy (root mean square error < 15 cm; normalized median absolute deviation < 10 cm) than airborne laser scanning (ALS) and digital aerial photogrammetry (DAP) data that are generally understood to be the best data sources for DTM on a large scale.

scholarly journals Uso de SIGS para geração de mapas com a localização média da goiaba (Psidium guajava) na margem noroeste do município de São Francisco, bacia hidrográfica do rio São Francisco, MG

ForScience ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. e00846
Author(s):  
Pedro Luiz Teixeira Camargo ◽  
Paulo Pereira Martins Júnior ◽  
Marcílio Baltazar Teixeira ◽  
Fernando Antônio Madeira ◽  
Raphaella karla Portes Beserra ◽  
...  
Keyword(s):  
Remote Sensing ◽  
River Basin ◽  
Psidium Guajava ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
Population Average ◽  
São Francisco River ◽  
Remote Sensing Techniques ◽  
Aid Decision ◽  
Support Methods

A gestão dos recursos naturais embasada no modelo do desenvolvimento sustentável é, sem dúvida, um dos maiores desafios de gestão ambiental. Para isso, técnicas de sensoriamento remoto têm sido cada vez mais usadas objetivando um melhor e maior auxílio à decisão. Na margem Noroeste (B) do município de São Francisco, Norte de Minas Gerais, localizado na bacia alto-média do rio São Francisco e onde o Cerrado natural sofreu intensa degradação no intervalo de 41 anos (1975-2016), realizou-se o presente estudo, objetivando, por meio da metodologia de sobreposição de imagens cartográficas, utilizando-se a ferramenta IDW do software Arcgis 10.2 gerar um mapa capaz de apresentar a média populacional da Goiaba (Psidium guajava) por ponto de coleta. Pode-se concluir, após a exitosa experiência metodológica aqui presente, que os seus exemplares arbóreos se localizam prioritariamente no extremo Sul da margem B, sendo interessante pensar como esta espécie, mesmo oriunda do Cerrado não se adaptou tão bem na área estudada. Uma hipótese para explicar isso se dá pelo fato de a semente da goiaba sofrer quebra de dormência, em geral, quando se tem flutuações abruptas de temperatura, algo não observado no local, com exceção das margens do rio São Francisco, exatamente o local onde se observa a presença dessa frutífera em maior quantidade. Recomendam-se mais estudos na região para verificação se a hipótese apresentada é de fato correta. Palavras-chave: Bacia do Rio São Francisco. Sensoriamento remoto. Métodos e técnicas de auxílio à decisão.   Use of sigs for generation of maps with the goiaba (Psidium guajava) middle location in the northwest margin of the São Francisco Municipal, São Francisco water, MG Abstract Managing natural resources responsibly is undoubtedly one of the biggest environmental management challenges. Thus, remote sensing techniques have been increasingly used to better and better aid decision making. In the Northwest (B) portion of the municipality of São Francisco, North of Minas Gerais, located in the upper-middle São Francisco River basin and where the natural Cerrado suffered intense degradation in the 41year interval (1975-2016), we conducted the present study, aiming, through the methodology of overlapping cartographic images, using the IDW tool of Arcgis 10.2 software to generate a map capable of presenting the population average of Goiaba (Psidium guajava) by collection point. We can conclude, after the successful methodological experience present here, that its tree specimens are located primarily in the extreme south of margin B, it is interesting to think how this species, even coming from the Cerrado, did not adapt so well in the studied area. A good hypothesis to explain this is due to the fact that the guava seed suffers from dormancy, in general, when there are abrupt fluctuations in temperature, something not observed in the place, except for the banks of the São Francisco River, exactly the place where observes the presence of this fruit in greater quantity. Further studies in the region are recommended to verify whether the hypothesis presented is indeed correct. Keywords: São Francisco river basin. Remote sensing. Decision support methods and Ttechniques.

scholarly journals ANÁLISE DO BALANÇO DE RADIAÇÃO E ENERGIA EM ÁREAS DE VEREDAS NO NORTE DE MINAS GERAIS, BIOMA CERRADO

2020 ◽  
Vol 18 (01) ◽  
pp. 220-247
Author(s):  
Gabriel Alves Veloso ◽  
Lucas Augusto Pereira da Silva ◽  
Manuel Eduardo Ferreira
Keyword(s):  
Remote Sensing ◽  
Energy Balance ◽  
Surface Energy ◽  
Surface Energy Balance ◽  
High Water ◽  
Minas Gerais ◽  
Landsat 8 ◽  
Cerrado Biome ◽  
Water Recharge ◽  
Remote Sensing Techniques

A vereda, típica formação no bioma Cerrado, é reconhecida por sua elevada capacidade de recarga hídrica, em função de uma topografia plana, solos hidromórficos e proximidade de matas de galeria/cursos hidrográficos. Estudos nesses ambientes ainda são escassos, especialmente aqueles voltados para o entendimento da dinâmica do balanço de radiação e energia, relacionado com processos ecológicos e climáticos. O objetivo do trabalho é analisar o comportamento do balanço de energia em ambientes de veredas no Norte de Minas Gerais, em área amostral específica, com técnicas avançadas de sensoriamento remoto, aplicando-se o algoritmo SEBAL (Surface Energy Balance Algorithms for Land). No contexto do balanço de energia, os seguintes valores médios foram obtidos para o inverno e verão, respectivamente: Rn 24 h de 98,71 Wm-2 e 230,95 Wm-2; G de 53,43 Wm-2 e 80,84 Wm-2; H de 26,93 Wm-2 e 88,52 Wm-2; LE de 77,78 Wm-2 e 142,34 Wm-2; e taxa de evapotranspiração de 2,53 mm.d-1 e 5,02 mm.d-1. As técnicas de sensoriamento remoto utilizadas neste estudo foram de grande utilidade para as análises em áreas de vereda, destacando com eficiência o comportamento do balanço de energia e evapotranspiração nesse importante ambiente no Cerrado. Palavras-chave: Savana. Recarga hídrica. Sazonalidade climática. SEBAL. Landsat 8.     ANALYSIS OF THE RADIATION AND ENERGY BALANCE IN VEREDAS AREAS IN NORTHERN MINAS GERAIS, CERRADO BIOME ABSTRACT The vereda, typical formation in the Cerrado biome, is recognized for its high-water recharge capacity, due the flat topography, hydromorphic soils and proximity to gallery forests / river courses. Studies in these environments are still scarce, especially those aimed at understanding the dynamics of the radiation and energy balance, related to ecological and climatic processes. The objective of the work is to analyze the energy balance behavior in vereda environments in Northern of Minas Gerais state, in a specific sample area, with advanced remote sensing techniques, applying the SEBAL algorithm (Surface Energy Balance Algorithms for Land). Among the results, it was observed that the behavior of the components of the balance of radiation and energy follow the meteorological and phenological dynamics expected for this phytophysiognomy. In the context of the energy balance, the following average values were obtained, in the winter and summer, respectively: Rn 24 h of 98.71 Wm-2 and 230.95 Wm-2; G of 53.43 Wm-2 and 80.84 Wm-2; H of 26.93 Wm-2 and 88.52 Wm-2; LE of 77.78 Wm-2 and 142.34 Wm-2; and evapotranspiration rate of 2.53 mm.d-1 and 5.02 mm.d-1. The remote sensing techniques used in this study were of great useful for analyzes in veredas, efficiently highlighting the behavior of energy balance and evapotranspiration in this important environment of Cerrado. Keywords: Savanna.  Water recharge.  Climatic seasonality.  SEBAL.  Landsat 8.    ANÁLISIS DE LA RADIACIÓN Y EL EQUILIBRIO ENERGÉTICO EN LAS ZONAS DE VEREDA EN EL NORTE DE MINAS GERAIS, CERRADO BIOME RESUMEN El Vereda, formación típica en el bioma Cerrado, es reconocido por su alta capacidad de recarga de agua, debido a su topografía plana, suelos hidromórficos y proximidad a bosques de galería / cursos hidrográficos. Los estudios en estos entornos aún son escasos, especialmente aquellos destinados a comprender la dinámica de la radiación y el equilibrio energético, relacionados con los procesos ecológicos y climáticos. El objetivo del trabajo es analizar el comportamiento del equilibrio energético en entornos de senderos en el norte de Minas Gerais, en un área de muestra específica, con técnicas avanzadas de teledetección, aplicando el algoritmo SEBAL (Algoritmos de equilibrio de energía de superficie para tierra).  En el contexto del balance energético, se obtuvieron los siguientes valores promedio para invierno y verano, respectivamente: Rn 24 h de 98.71 Wm-2 y 230.95 Wm-2; G de 53,43 Wm-2 y 80,84 Wm-2; H de 26.93 Wm-2 y 88.52 Wm-2; LE de 77.78 Wm-2 y 142.34 Wm-2; y tasa de evapotranspiración de 2.53 mm.d-1 y 5.02 mm.d-1. Las técnicas de detección remota utilizadas en este estudio fueron de gran utilidad para los análisis en áreas de senderos, destacando efectivamente el comportamiento del equilibrio energético y la evapotranspiración en este importante entorno en el Cerrado.  Palabras-clave: Savanna. Recarga de agua. Estacionalidad estacional. SEBAL. Landsat 8.

scholarly journals Determinação das Áreas Atingidas por Queimadas em Bacias Hidrográficas por meio do Índice De Queimada (NBR), Estudo de Caso da Bacia do Rio Piracicaba-MG

2020 ◽  
Vol 13 (1) ◽  
pp. 087
Author(s):  
Fernanda Paula Bicalho Pio ◽  
Eliane Maria Vieira
Keyword(s):  
Remote Sensing ◽  
River Basin ◽  
Forest Fires ◽  
Minas Gerais ◽  
Landsat 8 ◽  
Burned Areas ◽  
Remote Sensing Techniques ◽  
Burn Rate ◽  
Basin Region

O desenvolvimento da humanidade e consequente alteração no uso do solo vem tornando áreas cada vez mais susceptíveis à incêndios florestais, fato agravado pela prática de queimadas. Eventos de queima são considerados preocupantes devido a abrangência dos impactos que influenciam, inclusive nas mudanças climáticas. Assim, técnicas de sensoriamento remoto podem ser empregadas para identificação e espacialização de áreas queimadas. A gravidade dos impactos gerados torna visível a importância de estudos capazes de detectar cicatrizes de queimadas a fim contribuir com o desenvolvimento de técnicas de monitoramento, conscientização, prevenção e recuperação de áreas afetadas.  Assim, o presente estudo objetivou gerar o índice de queimada (NBR) bem como sua variação (NBR) e o Índice Normalizado de Diferença de Água (NDWI) para distinção entre áreas queimadas e áreas úmidas para a região da bacia hidrográfica do rio Piracicaba, Minas Gerais, utilizando cenas Landsat 8 órbita/ponto 217/074 e 218/074 dos meses de agosto e setembro de 2016. A eficiência do método para detecção de áreas queimadas foi analisada a partir da comparação com polígonos de queimadas do banco de dados do INPE e pontos de ocorrência de incêndio fornecidos pelo 4º Pelotão de Bombeiros Militar de Itabira. Os resultados da NBR foram classificados em níveis de severidade e mostraram-se eficientes para a detecção de áreas queimadas quando comparados com polígonos de registro de queimadas do INPE. Com o cálculo do índice para toda a bacia pôde-se perceber regiões com maior ocorrência das classes moderada e alta severidade nas porções noroeste e nordeste da bacia. Determination of Areas Affected by Burns in Watersheds by the Queimada Index (Nbr), Case Study of the Piracicaba-MG River Basin ABSTRACTThe development of mankind and consequent alteration in land use has made areas increasingly susceptible to forest fires, a fact aggravated by the practice of burning. Burning events are considered worrisome due to the extent of the impacts that influence, including climate change. Thus, remote sensing techniques can be used to identify and spatialize burned areas. The severity of the impacts generated makes visible the importance of studies capable of detecting burn scars in order to contribute to the development of monitoring techniques, awareness, prevention and recovery of affected areas. Thus, the present study aimed to generate the burn rate (NBR) as well as its variation (ΔNBR) and the Normalized Water Difference Index (NDWI) to distinguish between burned areas and wetlands for the Piracicaba river basin region, Minas Gerais, using Landsat 8 scenes orbit / point 217/074 and 218/074 from the months of August and September 2016. The efficiency of the method for the detection of burned areas was analyzed from the comparison with burned polygons of the INPE and fire occurrence points provided by the 4th Itabira Military Fire Squad. The results of ΔNBR were classified in severity levels and were efficient for the detection of burned areas when compared to INPE burn logs. With the calculation of the index for the whole basin it was possible to perceive regions with higher occurrence of the moderate and high severity classes in the northwest and northeast portions of the basin.Keywords: burned, sevirity of fire, remote sensing, burn rate

scholarly journals Land use and occupation analysis of Permanent Preservation Areas in Lavras County, MG

2012 ◽  
Vol 36 (3) ◽  
pp. 300-308 ◽  
Author(s):  
Aliny Aparecida dos Reis ◽  
Marcelo Dias Teixeira ◽  
Fausto Weimar Acerbi Júnior ◽  
José Marcio de Mello ◽  
Lucilia Rezende Leite ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Information Systems ◽  
Geographic Information Systems ◽  
Deciduous Forest ◽  
Bare Soil ◽  
Native Vegetation ◽  
Environmental Legislation ◽  
Brazilian Legislation ◽  
Water Courses

The Permanent Preservation Areas (PPAs) are considered essential for the maintenance of local biodiversity, so that your protection is regulated by the Brazilian legislation. This work had the objective of delimiting permanent preservation areas according to determinations of the current Brazilian environmental legislation, and identify the occurrence of conflict between the land use and legislation in Lavras county, MG, by combination of technologies of remote sensing and geographic information systems. The PPAs correspond to 42.33% of Lavras county's territory. The conflict between the land use and environmental legislation occurs in 63.48% of PPAs' territory, mainly corresponding to the pasture areas, bare soil and agriculture. The PPAs of tops of hills showed the highest conflicts with the legislation, with 48.48% of the territory occupied by pastures, and 13.62% by agriculture. The PPAs located in the surrounding of water courses and in the slopes with declivity higher than 45º presented 59.99% and 92.03%, respectively of the territory occupied by native vegetation of semi-deciduous forest and natural fields.

Monitoring land use change in the Lake Taupo catchment between 1975, 1990 and 2002 using satellite remote sensing data

2007 ◽  
pp. 17-22
Author(s):  
H. Lilienthal ◽  
A. Brauer ◽  
K. Betteridge ◽  
E. Schnug
Keyword(s):  
Remote Sensing ◽  
Water Quality ◽  
Land Use ◽  
Land Use Change ◽  
Satellite Remote Sensing ◽  
Remote Sensing Data ◽  
Native Vegetation ◽  
Lake Water Quality ◽  
Livestock Farming ◽  
Slow Decline

Conversion of native vegetation into farmed grassland in the Lake Taupo catchment commenced in the late 1950s. The lake's iconic value is being threatened by the slow decline in lake water quality that has become apparent since the 1970s. Keywords: satellite remote sensing, nitrate leaching, land use change, livestock farming, land management

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