Fotointerpretação comparativa de fotografias pancromáticas coloridas e infravermelhas coloridas através da drenagem
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Data
1976-01-01
Autores
Garcia, Gilberto Jose [UNESP]
Marchetti, Delmar A. B.
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Universidade de São Paulo (USP), Escola Superior de Agricultura
Resumo
O presente trabalho teve por objetivo avaliar quantitativamente as informações obtidas por diferentes tipos de fotografias. Os estudos basearam-se em fotografias pancromáticas, coloridas e infravermelhas coloridas de uma área teste localizada no município de Campinas - SP. A cobertura fotográfica denominada Missão 96 resultou da colaboração científica entre INPE - Instituto de Pesquisas Espaciais, NASA - National Aeronautics and Space Administration e IAC - Instituto Agronômico do Estado de São Paulo. A rede de drenagem foi o elemento de comparação tendo sido estudados dois parâmetros: número de segmentos de rios e comprimentos de rios. A rede de drenagem foi estudada em monoscopia e em estereoscopia, onde as medições foram efetuadas em amostras circulares de 10 km² (parcelas), sendo que o delineamento experimental foi o de parcelas inteiramente casualizadas. Os dados obtidos foram utilizados para avaliar a eficiência de cada tipo de fotografia, para; os parâmetros considerados. Para as condições estudadas, obteve-se as seguintes conclusões principais: a) a fotografia infravermelha forneceu maior número de informações comparativamente às fotografias pancromáticas e coloridas, as quais ofereceram resultados semelhantes; b) os resultados obtidos pela análise monoscópica da fotografia infravermelha foram semelhantes aos resultados obtidos pela análise estereoscópica da fotografia pancromática, o que pode facilitar bastante o processo fotointerpretativo.
The present work had as its main aim a quantitative evaluation of information obtained through different types of photographs. The studies were based on panchromatic, color and color infrared photographs of a test area located in the municipality of Campinas - SP. The photographic flight was carried on by means of a scientific cooperation of INPE - Instituto de Pesquisas Espaciais, NASA - National Aeronautics and Space Administration and IAC - Instituto Agronômico do Estado de São Paulo and was known Mission 96. The drainage was the parameter analysed, and were measured the quantity and lenght of channels. The drainage network was studied monoscopically and stereoseopically, and the measurements were made in circular samples 10 km², randomily orientated. The obtained data were used to evaluate the efficiency of every of photograph, for the studied variables. on the basis of the present study, the quantitative analysis led to the following main conclusions: a) Color infrared photography was the best in the study of the drainage network quantitative characteristics, comparatively to panchromatic and color photographs; b) The results obtained in studying drainage through the monoseopic study of infrared color photography were similar to the results of stereoscopic analysis of the panchromatic photography, wich would present a better readiness in the photointerpretation process.
The present work had as its main aim a quantitative evaluation of information obtained through different types of photographs. The studies were based on panchromatic, color and color infrared photographs of a test area located in the municipality of Campinas - SP. The photographic flight was carried on by means of a scientific cooperation of INPE - Instituto de Pesquisas Espaciais, NASA - National Aeronautics and Space Administration and IAC - Instituto Agronômico do Estado de São Paulo and was known Mission 96. The drainage was the parameter analysed, and were measured the quantity and lenght of channels. The drainage network was studied monoscopically and stereoseopically, and the measurements were made in circular samples 10 km², randomily orientated. The obtained data were used to evaluate the efficiency of every of photograph, for the studied variables. on the basis of the present study, the quantitative analysis led to the following main conclusions: a) Color infrared photography was the best in the study of the drainage network quantitative characteristics, comparatively to panchromatic and color photographs; b) The results obtained in studying drainage through the monoseopic study of infrared color photography were similar to the results of stereoscopic analysis of the panchromatic photography, wich would present a better readiness in the photointerpretation process.
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Anais da Escola Superior de Agricultura Luiz de Queiroz. Universidade de São Paulo (USP), Escola Superior de Agricultura, v. 33, p. 441-453, 1976.