The use of aerial videography in the detection of areas with nutricional deficiency in eucalyptus plantation. / Utilização da videografia aérea na detecção de áreas com deficiências nutricionais em plantios de eucalipto.

AUTOR(ES)

Paulo Pompermayer Neto

DATA DE PUBLICAÇÃO

2002

RESUMO

The aerial videography is a technique that has been used in the USA to evaluate, detect and prevent agricultural problems, as well as in the handling of natural areas. One of the reasons for the employment of this technique is its low cost for obtaining the images and the speed with that they can be captured, processed and analyzed. The aim of this work was to verify the usefulness of the videography technique in detecting nutritional deficiency in eucalyptus plantations, using it as a tool in the nutritional monitoring, turning it more precise and less costly than the methods used at present. For this, an experiment was settled with treatments of subtraction of nutrients with the purpose of verifying the potentiality of the aerial videography as technique to distinguish the treatments with nutritional deficiency in eucalyptus plantation. Images were obtained in the green, blue, red and infrared close spectrum, after 12 months of plantation. Those images were obtained with two cameras S-VHS: one capable of capturing the bands of the visible spectrum (400 - 700 nm) and other capable of capturing the bands in the visible and near infrared band (400 - 1100 nm). In these cameras, subtraction filters were also used to separate the bands of the spectrum to work. Besides, with the use of the software ENVI, it was made an analysis of the values of pixels of each portion, being obtained the minimum, medium, maximum values and the mean standard deviation. Then, these values were compared to each other and put together according to the multivariate statistical analysis, looking for relationships between the data of the images and the treatments. Significant relationships between the tree and pixel values data were found for the images obtained in 1500 m high by the camera COHU, in the spectra blue and close infrared and for the camera PANASONIC, in the red band.

ASSUNTO(S)

nutricional deficiency videography espectro eucalypt spectrum deficiência nutricional eucalipto viodegrafia

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