Indirect orientation of CBERS Images: an assessment of techniques using straight lines and their combination with points

• Autor(a) principal: MEDEIROS, NILCILENE DAS GRAÇAS
• Data de Publicação: 2009
• Outros Autores: TOMMASELLI, ANTONIO MARIA GARCIA
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Boletim de Ciências Geodésicas
• Texto Completo: https://revistas.ufpr.br/bcg/article/view/13900
• topic: Fotogrametria; Orientação de imagens; Sensor de varredura linear; Feições Lineares; CBERS.

The aim of this paper is to present and assess techniques for orientation of pushbroom sensors that allow the estimation of the polynomial coefficients describing the platform trajectory, using linear features and linear features combined with points as ground control. The pushbroom image acquisition is not instantaneous and, as a consequence, six EOP (Exterior Orientation Parameters) for each scanned line must be estimated. The  sensor position and attitude parameters are modeled with a time dependent polynomial. The proposed mathematic model is based on the equivalence property between planes, considering the pushbroom geometry. The relationship between object and image space is established through a mathematical model based on the equivalence between the vector normal to the projection plane in the image space and  to the vector normal to the rotated projection plane in the object space. The model based on collinearity equations using points adapted to the pushbroom geometry was also implemented aiming at the comparison of the techniques, as well as to evaluate the use of control points and straight lines simultaneously. Some experiments using a CBERS scene were accomplished in order to test the developed techniques. The obtained results showed that is possible estimate the EOP of pushbroom images using straight lines and that the combination of straight lines with points is a more flexible alternative that allows good results.