Marcelo Folhes

IbiGeo Geociência Aplicada

In recent years, supervised Deep Neural Networks have achieved the state-of-the-art in image recognition and this success has spread in many areas. In agricultural field, several researches have been conducted using architectures such as Convolutional Neural Networks. Despite this success, these works are still highly dependent on very time–costly...

These paper reports applications using satellite images to the identification of vegetation types in the Campo Grande city. This identification allows studies of urban vegetation, palynology and environmental changes. Images from Landsat 8 and Rapideye satellites from the Campo Grande urban area were used. A soil coverage map was done for each one...

Weeds are undesirable plants that grow in agricultural crops, such as soybean crops, competing for elements such as sunlight and water, causing losses to crop yields. The objective of this work was to use Convolutional Neural Networks (ConvNets or CNNs) to perform weed detection in soybean crop images and classify these weeds among grass and broadl...

Northeast of Brazil is a semi-arid region, where water is a key strategic resource in the development of all sectors of the economy. Irrigation agriculture is the main water consumer in this region. Therefore, policy directives are calling for tools to aid operational monitoring in planning, control and charging of irrigation water. Using Landsat i...

Understanding local variability in context and mobilising local participation to define development agendas are widely accepted development strategies. There remain, however, significant challenges to the systematic and effective inclusion of local communities and households. Projeto MAPLAN, a pilot project in Ceará, Brazil, is a joint effort of th...

This article examines the meteorological interpretations of phenomenon that are made by careful observers of nature. The climate forecasts, made by the sertanejos and based on empirical observations, have relevance for the probability-based climate forecasts developed by meteorological institutions. In 1998 research was carried out in six different...

This article examines the meteorological interpretations of phenomenon that are made bycareful observers of nature. The climate forecasts, made by the sertanejos and based onempirical observations, have relevance for the probability-based climate forecasts developedby meteorological institutions. In 1998 research was carried out in six different mu...

Mapping Evapotranspiration at High Resolution and with Internalized Calibration (METRIC) has been applied for mapping surface heat fluxes over tropical deciduous xerophytic woodland (caatinga). METRIC requires spatially distributed, visible, near-infrared and thermal infrared spectral data, which can be derived from TM/Landsat, and limited input da...

The objective of this study is to evaluate existing temporal and spatial patterns in the precipitation historical data in the Paraíba do Sul watershed, using newly available geostatistical analysis. Resulting rainfall maps showed pronounced regional and seasonal variations as well as a strong association with the topographic map. This study is a wo...

Este artigo trata da interpretação das manifestações da natureza que estão associadas com as previsões meteorológicas e que é atribuída às pessoas que possuem aguçada sensibilidade de observação. As previsões elaboradas pelos sertanejos, com base em sua experiência empírica, podem ser importantes para as projeções climáticas feitas, com base probab...

Este trabalho tem por objetivos apresentar as principais características da distribuição temporal da precipitação e da temperatura do ar em Taubaté (SP), além de estabelecer uma caracterização do período da estação chuvosa, bem como verificar a ocorrência de tendências nas séries temporais desses dois elementos climáticos por meio do teste não para...

Distribution of regional net radiation flux density over an irrigated agricultural area was analysed using a method that combine satellite remote sensing with field observation. Measurement of net radiation was collected over an irrigated banana field. Using the net radiation submodel implemented in METRIC in combination with TM/Landsat image, the...

This study deals with components of local water supply and demand. On the supply side, it presents an appraisal of the spatial and social distribution, together with water quality conditions of deep wells in the municipal district of Taua, located in the southwestern region of the state of Ceará, where, as a typical aspect of the semiarid tropics i...

Increased competition for fresh water among a variety of users in the semi-arid region of Northeast of Brazil has led to heightened interest among water resource managers in the possibilities of monitoring water use through application of remote sensing techniques. This paper presents a brief proposal to improve the ability to locate irrigated agri...