1. Caractrização espectral multitemporal dos cereais de estação fria em imagens de satéllte com média resoção espacial.
- Author
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da Fonseca, Eliana Lima, Caresani, Jose Rodrigo Fernandez, and Varella, Alexandre Costa
- Subjects
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VEGETATION mapping , *PLANT phylogeny , *PLANT morphology , *RYEGRASSES , *WHEAT , *GLOBAL Positioning System - Abstract
In order to evaluate the satellite image patterns between such cool season cereals cultivated areas intended for grazing or grain production, Normalized Difference Vegetation Index (NDVI) temporal profiles were analyzed. This data was acquired from twenty nine wheat and annual ryegrass cultivated areas in the states of Rio Grande do Sul and Paraná. For each area, the cultivated species (wheat or ryegrass), as well as the respective central point coordinates, acquired via Global Positioning System (GPS) was informed. NDVI values were extracted over each monitored area from MODIS (Moderate Resolution Imaging Spectroradiometer) sensor images, with spatial resolution of 250 meters. The NDVI temporal profiles showed that grain production areas have a typical agricultural field spectral pattern. The same pattern was not observed for the grazing pasture areas. The differences observed in these temporal patterns are defined by the changes that grazing has imposed on the phenology and morphology of these plants. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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