Oriented aerial photographs of Lower Saxony
Description
Oriented aerial photographs are a combination of already existing data for official tasks. As part of the multi-month production process of digital orthophotos (DOP), the digital original measurement images are available at an early stage in conjunction with the respective orientation data and the camera calibration protocol; the spatial assignment of the original digital measurement images is possible on the basis of an image center overview. The orientation data contain the parameters of the external orientation (position and orientation of the reception center in the room). After the image flight, these data are initially available via direct georeferencing using GPS and Inertial Navigation System (INS) with a position and altitude accuracy of approximately 0.5 m. In the course of the subsequent aerotriangulation (AT), i.e. the calculation of the orientation parameters via pass points in the image block association, the accuracy of the orientation parameters is usually increased to less than 0.2 m in position and 0.4 m in height. The GPS/INS orientation data is available shortly after the delivery of the image flight data. The subsequent calculation of the more accurate AT orientation data takes a few weeks.
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