Analysis of sensor model accuracy on estimating exterior orientation parameters of satellite images

Abstract

The main objective of this paper is to investigate accuracy of various sensor models developed for linear pushbroom-type satellite images. In particular this paper investigates the accuracy of sensor models in two aspects; the accuracy of bundle adjustments and the accuracy of estimating exterior orientation parameters. Analysis of the first accuracy has been reported by many previous studies whereas the analysis of the second accuracy has somewhat been neglected. We argue that the second accuracy is as important as the first one. It describes a model's ability to predict satellite orbit and attitude, which has many direct and indirect applications. We implemented and tested two types of physical sensor models based on the collinearity equations: one with position and euler angles as model parameters and the other with orbit and attitude angles as model parameters. Tests were carried out with two Kompsat-1 EOC scenes and GPS-driven control points. Test results showed that the model with orbit and attitude parameters produced better estimation of exterior orientation parameters while maintained comparable accuracy of bundle adjustments. © 2005 IEEE.