Use of LANDSAT data for automatic classification and area estimation of sugarcane plantation in Sao Paulo state, Brazil

Ten segments of the size 20 x 10 km were aerially photographed and used as training areas for automatic classifications. The study areas was covered by four LANDSAT paths: 235, 236, 237, and 238. The percentages of overall correct classification for these paths range from 79.56 percent for path 238 to 95.59 percent for path 237

Rise in the frequency of cloud cover in LANDSAT data for the period 1973 to 1981

Percentages of cloud cover in LANDSAT imagery were used to calculate the cloud cover monthly average statistic for each LANDSAT scene in Brazil, during the period of 1973 to 1981. The average monthly cloud cover and the monthly minimum cloud cover were also calculated for the regions of north, northeast, central west, southeast and south, separately

Heuristic for estimation of multiqubit genuine multipartite entanglement

For every N-qubit density matrix written in the computational basis, an associated "X-density matrix" can be obtained by vanishing all entries out of the main- and anti-diagonals. It is very simple to compute the genuine multipartite (GM) concurrence of this associated N-qubit X-state, which, moreover, lower bounds the GM-concurrence of the original (non-X) state. In this paper, we rely on these facts to introduce and benchmark a heuristic for estimating the GM-concurrence of an arbitrary multiqubit mixed state. By explicitly considering two classes of mixed states, we illustrate that our estimates are usually very close to the standard lower bound on the GM-concurrence, being significantly easier to compute. In addition, while evaluating the performance of our proposed heuristic, we provide the first characterization of GM-entanglement in the steady states of the driven Dicke model at zero temperature.Comment: 19 pages, 5 figure

Remote sensing applied to agriculture: Basic principles, methodology, and applications

The general principles of remote sensing techniques as applied to agriculture and the methods of data analysis are described. the theoretical spectral responses of crops; reflectance, transmittance, and absorbtance of plants; interactions of plants and soils with reflectance energy; leaf morphology; and factors which affect the reflectance of vegetation cover are dicussed. The methodologies of visual and computer-aided analyses of LANDSAT data are presented. Finally, a case study wherein infrared film was used to detect crop anomalies and other data applications are described

Método EPS para manejo da irrigação de forrageiras.

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Use of LANDSAT data for estimating the area of sugar cane in the state of Sao Paulo

There are no author-identified significant results in this report

Experimentação participativa no âmbito do programa Brasil Sem Miséria no território da cidadania do agreste de Alagoas.

A Embrapa Tabuleiros Costeiros vem desenvolvendo desde 2012 a construção participativa de soluções agroecológicas junto ao Plano Brasil Sem Miséria ? PBSM, no Território Agreste Alagoano. O objetivo deste trabalho é a sistematização de experiências agroecológicas nas Unidades de Experimentação - UE?s - em 12 municípios inseridos no PBSM. O processo se constituiu em: aracterização socioeconômica e conhecimento da realidade local; planejamento com sensibilização, visita ao local da experimentação e desenho de mapas da UE?s; implantação das UE?s e; capacitações em Agroecologia e no manejo de caprinos e ovinos. Conclui-se que a participação dos agricultores no processo de planejamento enfatizou o protagonismo social destes, além de contribuírem para formação de sistemas de produção adaptados a realidade local, sendo assim um processo rico para construção do conhecimento agroecológico

Estimation of the sugar cane cultivated area from LANDSAT images using the two phase sampling method

A two phase sampling method and the optimal sampling segment dimensions for the estimation of sugar cane cultivated area were developed. This technique employs visual interpretations of LANDSAT images and panchromatic aerial photographs considered as the ground truth. The estimates, as a mean value of 100 simulated samples, represent 99.3% of the true value with a CV of approximately 1%; the relative efficiency of the two phase design was 157% when compared with a one phase aerial photographs sample