Multitemporal spectral characterization of cool season cereals in satellite images with moderate spatial resolution/Caracterizacao espectral multitemporal dos cereais de estacao fria em imagens de satelite com media resolucao espacial

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 cultivat...

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Bibliographic Details
Published in:Ciência rural 2010-10, Vol.40 (10), p.2053
Main Authors: da Fonseca, Eliana Lima, Caresani, Jose Rodrigo Fernandez, Varella, Alexandre Costa
Format: Article
Language:Spanish
Subjects:
Global Positioning System
Sensors
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Summary: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 Parana. 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.
ISSN:0103-8478