This paper presents an inexpensive, efficient, low-weight airbornern system based on two non-metric cameras together with a GNSS receiver and its antenna, The main camera is oriented towards the ground, and the other, being a solar camera, is oriented towards the sun and used instead of an IMU system to determine the system's tilt angles. The device can be carried by small helicopter, any tiny air carrier, or even an unmanned small aircraft. The system is suitable for large scale photogrammetric mapping of small tracts of difficult terrain of special interest, and allows the recording of small but significant land deformations which occur within a short time span. The photogrammetric measurements are done without any ground control: the images ' exterior orientations are determined by the coordinates of the GPS antenna's position at the moment of exposure as well as by the sun's geocentric position and by the location of its image in the solar photo. This paper describes the calibration of such a system. 1
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