Theoretical Aspects of the On-Orbit Geometric Calibration of Pushbroom Linear Imaging Remote Sensors

Abstract

In order that the full potential of geometric accuracy of spatial information extracted from images of orbital pushbroom linear remote sensors can be achieved, it is essential that all systematic errors present in the data acquisition process are taken into account. In addition, the proximity of values to physical reality is essential. In the context of the rigorous orientation, the interior orientation parameters must be properly identified and their values must be estimated before and immediately after the sensor is placed on orbit. Likewise, the refinement of the mounting parameters and the refinement of the alignment of the spectral bands must occur. On orbit, from time to time, new estimates are necessary to verify changes in values. This is not only due to change in the physical characteristics of the environment, but also due to the wear and tear of the constituent internal components. This activity is called on orbit geometric calibration. In this paper the main theoretical aspects involved in the process were presented, without, however, intending to exhaust the subject.