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| Registros recuperados: 12 | |
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| EBERHARDT, I. D. R.; MELO, M. P.; RIZZI, R.; FORMAGGIO, A. R.; ATZBERGER, C.; LUIZ, A. J. B.; FOSCHIERA, W.; SCHULTZ, B.; TRABAQUINI, K.; GOLTZ, E.. |
| Abstract: Cloud cover is the main issue to consider when remote sensing images are used to identify, map and monitor croplands, especially over the summer season (October to March in Brazi). This paper aims at evaluating clear sky conditions over four Brazilian states (Sa?o Paulo, Parana?, Santa Catarina, and Rio Grande do Sul) to assess suitable observation conditions for a monthly basis operational crop monitoring system. Cloudiness was analyzed using MODIS Cloud Mask product (MOD35), which presents four labels for cloud cover status: cloudy, uncertainty, probably clear and confident clear. R software was used to compute average values of clear sky with a confidence interval of 95% for each month between July 1st, 2000 and June 30th, 2013. Results showed... |
| Tipo: Separatas |
Palavras-chave: Sensoriamento remoto; Nuvem; Produção agrícola; Remote sensing; Crop production; Cloud cover. |
| Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1011631 |
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| TRABAQUINI, K.; SILVA, G. B. S. da; SANCHES, I. D.; NOGUEIRA, S. F.; DORTZBACH, D.. |
| This work aims to analyze the dynamics of land use change by evaluating the spatio-temporal changes of sugarcane, verified in the period between 2000 and 2015, in the western portion of the São Paulo state. The study area includes parts of the municipalities of Andradina, Muritinga do Sul, Guaraçaí and Pereira Barreto, totaling an area of 1,115 km2. From a multitemporal series of Landsat satellite images of 30 m spatial resolution, the land use information was obtained for the sixteen years, using the Spring software. Land use and land cover maps were analyzed for each date, and the expansion of sugarcane activity in the region was verified, annually, for the period analyzed. As results, it was observed that sugarcane had an expansion in area between the... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Uso do solo; Processamento de imagem; Paisagem; Image processing.; Land use.. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1073391 |
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| EBERHARDT, I. D. R.; SCHULTZ, B.; RIZZI, R.; SANCHES, I. D.; FORMAGGIO, A. R.; ATZBERGER, C.; MELLO, M. P.; IMMITZER, M.; TRABAQUINI, K.; LUIZ, A. J. B.; FOSCHIERA, W.. |
| Abstract: The potential of optical remote sensing data to identify, map and monitor croplands is well recognized. However, clouds strongly limit the usefulness of optical imagery for these applications. This paper aims at assessing cloud cover conditions over four states in the tropical and sub-tropical Center-South region of Brazil to guide the development of an appropriate agricultural monitoring system based on Landsat-like imagery. Cloudiness was assessed during overlapping four months periods to match the typical length of crop cycles in the study area. The percentage of clear sky occurrence was computed from the 1 km resolution MODIS Cloud Mask product (MOD35) considering 14 years of data between July 2000 and June 2014. Results showed high... |
| Tipo: Separatas |
Palavras-chave: Monitoramento agrícola; Clear sky coverage; Agriculture monitoring; Crop classification; MODIS; Imagem de satélite; Cloudiness.; Sensoriamento remoto; Agricultura; Nuvem.; Remote sensing.. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1060359 |
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| EBERHARDT, I. D. R.; LUIZ, A. J. B.; FORMAGGIO, A. R.; SANCHES, I. D.; SCHULTZ, B.; TRABAQUINI, K.. |
| Abstract: Nowadays the challenge in agricultural estimates using remote sensing is to produce the estimates and data across the crop season, in near real-time. The aim of this paper is to build an approach capable to produce the crop maps of soybean+maize in near real-time, for Rio Grande do Sul state, using MODIS images. To generate the near real-time crop maps we used the MODIS 16 days composites vegetation index (VI) images of NDVI and EVI. This new approach was called Near Real-Time Crop Fields Detection (DATQuaR). The MODIS VIs images were aggregated in bimonthly periods using different ways: average, maximum, minimum and median of registered values. After that, the image of the previous period was subtracted from the image of the monitored period,... |
| Tipo: Separatas |
Palavras-chave: Mapas de cultivo de verão; MODIS; DATQuaR; Sensoriamento remoto; Estatística agrícola; Remote sensing; Statistics. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1035217 |
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| LUIZ, A. J. B.; SANCHES, I. D. A.; TRABAQUINI, K.; EBERHARDT, I. D. R.; FORMAGGIO, A. R.. |
| Abstract: In this study, the tracking of different types of agricultural land use was assessed over time using the overlap regions of adjacent Landsat Operational Land Imager (OLI) scenes. WRS-II scenes 219 e 220/75 were acquired between July and October 2014. In the same period, 55 georeferenced sites were visited monthly, to acquire information about their use and to photograph them. The study covered an area of 100 km long by 4 km wide along a highway in the mesoregion of Campinas, state of São Paulo, Brazil. The main agricultural crops in the state were present in this area, such as sugarcane, maize, soybean, eucalyptus, pastures, citrus; and over a dozen land uses were found. Several selected areas are irrigated by center pivot systems. In this short... |
| Tipo: Separatas |
Palavras-chave: Cropland identification; Change detection; Temporal resolution; Monitoramento; Identificação de culturas; Detecção de mudanças; Resolução temporal.; Sensoriamento remoto; Uso da terra; Remote sensing; Land use change; Cropland; Monitoring.. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1035214 |
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| TRABAQUINI, K.; SILVA, G. B. S. da; TAKEDA, M. M. G.; FORMAGGIO, A. R.; SIMABUKURO, Y. E.. |
| The Cerrado biome has approximately two million square kilometers, which represents 23% of the country extension. With a large territory, it is considered one of the hotspots of the Planet, ie, a priority area for conservation. However, with favorable soil and climate characteristics, this biome has become the subject of great affluence for agricultural purposes since the 1970s. With government incentives, conditions for the expansion of agriculture were created. All these factors were decisive to the expansion of so-called "agricultural frontier?, which provided important positive impacts on the Brazilian economy. However, concomitantly, increasing environmental changes are observed in this biome. The anthropogenic occupation has as the first action the... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Savana; Mesorregiões; Vegetação potencial.; Desmatamento; Geomorfologia; Solo.. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/902195 |
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| TRABAQUINI, K.; SILVA, G. B. S. da; FORMAGGIO, A. R.; SHIMABUKURO, Y. E.; GALVÃO, L. S.. |
| The Cerrado biome occupies approximately 2 million square kilometers in the Central portion of Brazil representing 23% of our country’s extension, and it is considered to be one of the hotspots in our Planet, that is, a high-priority area for conservation. However, this biome has become the object of great and accelerated demand for agriculture and cattle ranching activities since the 1970 decade, because it has favorable soils, reliefs, and climatic characteristics. Thus, this work has aimed to study the dynamics of change in spatial distribution of anthropic activities in the Cerrado of Mato Grosso in the period from 1990 to 2008, in order to understand the process of occupation that took place there, and also in order to subsidize policies for... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Anthropization; Sustainability.; Brazilian Savanna; Deforestation.. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/972187 |
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| TRABAQUINI, K.; LUIZ, A. J. B.; EBERHARDT, I. D. R.; SCHULTZ, B.; FORMAGGIO, A. R.; ATZBERGER, C.. |
| Abstract: Brazil still has not a system based in earth observation images to map and monitoring the aimed crops in large scale. Many programs have been made with Landsat-like and MODIS data to monitoring crops in Brazil, but only the CANASAT has worked in operation level. The clouds and unit products (UPS) size in Brazil, have not permitted the use these data to correct classify maize, sugarcane and soybean. The use of sample frame and visual pixels classification with multitemporal OLI images could be a solution to monitor these three crops. The goal of this study was evaluate the sample frame performance to maize (c1), soybean (c2) and sugarcane (c3) in Paraná (PR) State using OLI images and pixel visual classification. Were used four periods to classify... |
| Tipo: Separatas |
Palavras-chave: Statistical sampling; Amostragem estatística; Romote sensing.; Estatística agrícola; Agricultura; Sensoriamento Remoto.; Agricultural statistics; Sampling; Agriculture; Remote sensing.. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1035210 |
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| SANCHES, I. D.; LUIZ, A. J. B.; MONTIBELLER, B.; SCHULTZ, B.; TRABAQUINI, K.; EBERHARDT, D. S.; FORMAGGIO, A. R.; MAURANO, L. E. P.. |
| Abstract: The agricultural activity can greatly benefit from remote sensing technology (RS). Optical passive RS has been vastly explored for agricultural mapping and monitoring, in despite of cloud cover issue. This is observed even in the tropics, where frequency of clouds is very high. However, more studies are needed to better understand the high dynamism of tropical agriculture and its impact on the use of passive RS. In tropical countries, such as in Brazil, the use of current agricultural technologies, associated with favourable climate, allow the planting period to be wide and to have plants of varying phenological cycles. In this context, the main objective of the current study is to better understand the dynamics of a selected area in Southeast of... |
| Tipo: Artigo de periódico |
Palavras-chave: Satellite image; Optical sensor; Multispectral; RGB false composition; NDVI; Sensoriamento Remoto; Satélite; Agricultura; Satellites; Image analysis; Image interpretation; Tropical agriculture; Monitoring. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1116250 |
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| MANJOLIN, R.; GREGO, C. R.; NOGUEIRA, S. F.; SILVA, G. B. S. da; TRABAQUINI, K.; SANCHES, I. D.. |
| The spatial variability of soil and plant properties has been a concern of researchers, since the variation of any phenomenon in space or time, whether caused by natural processes or by man-imposed actions, has always existed and need considered. The objective was relate spatial variability of chemical attributes, including carbon and nitrogen, to pasture and sugarcane areas in the west of the state of São Paulo. A total of 36 points were sampled in the west of the state of São Paulo in areas of pasture and sugar cane. For each point were collected soil chemical data at depth of 0 cm to 30 cm in March 2015. For identification of spatial dependence, data interpolation and for the elaboration of the maps, the geostatistical analysis was used including... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Geoestatística; Krigagem; Atributo do solo; Uso do solo. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1073581 |
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| Registros recuperados: 12 | |
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