Caracterização espectro-temporal de cultivares de arroz irrigado por meio de imagens Landsat

Abstract

The monitoring of spectral characteristics over time through satellite imagery is scientifically recognized for providing information that may be associated with the type of cultivar or variety, vigor, density, health, nutrition and phenological stages. This can be done by conveniently processing the information contained in the lectromagnetic waves reflected by the earth's surface, using, for example, the socalled vegetation indexes. Knowledge of the spectral signature of different irrigated rice cultivars becomes an important tool for the monitoring and inspection of agricultural crops, since it can facilitate the work of public certification bodies and grain receiving industries. In this work, the cultivars IRGA 409, IRGA 424, IRGA 426, IRGA 429 and IRGA 430 were monitored. Through the association of field data and temporal profiles of NDVI throughout the crop cycle the spectral characteristic of the cultivars was described. For this purpose, 11 images of the LANDSAT8 / OLI satellite were used in the orbit 224/80 and 225/80. The spectral curves along the cycle presented divergent spectral behavior among the different cultivars in terms of growth onset, rapid growth rate, time and maximum NDVI value, senescence rate. The spectral behavior of the different cultivars can be differentiated, but it is perceived that the differentiation depends critically on the quality of the data and the image processing.