GEOMETRIC CALIBRATION OF THE STEREOSCOPIC CCD-LINESCANNER MOMS-2P

摘要

This paper describes the geometric calibration of the Modular Optoelectronic Multispectral Scanner MOMS-2P, which will collect threefold stereoscopic panchromatic and multispectral imagery of the earth with 18 m and 6 m ground pixel size from the PRIRODA module of the Russian space station MIR. The goal of the geometric calibration is the knowledge of the exact object side image angles for a precise photogrammetric three-dimensional reconstruction of the earth's surface, considering all geometric influences of the scanner like irregularities of the CCD-arrays, bending and relaxation of the focal plates, distortion of the optics, etc. Prior to the mission the optical system has been calibrated in the laboratory of Daimler-Benz Aerospace AG (Dasa), which is also the developer and manufacturer of the scanner. During the mission a geometric inflight calibration will be performed in order to verify the calibration parameters on a routine basis. The first part of the paper describes the lab-calibration, the equipment, the process and shows also the resulting calibration parameters. The second part deals with the inflight calibration. The principle, the test areas and the mission scenario are outlined. An approach for multi-scale matching using line scanner imagery and existing digital orthoimages is described. Finally the results of a simulation study are presented, showing to which extend the camera parameters can be determined by photogrammetric means under realistic conditions.