Russian Federation
CSCSTI 36.29
In modern digital photogrammetric systems, image self-calibration is performed during data processing. This process is typically performed by default. The horizontal and vertical georeferencing of images during topographic surveys must take into account the specifics of ground-based self-calibration support. Elevation variations between control points must be greater than the possible elevations of the points being determined. If this requirement is not met, additional determination of the coordinates of the photographic centers is necessary. In flat areas with high-rise buildings, georeferencing of the coordinates of landmarks and photographic centers is required. This allows for the determination of reliable calibration parameters corresponding to the entire coordinate space of the object. In the practice of cadastral works, aerial photography is often limited to referencing the centers of photography. At best, a base station serves as a marker on the ground. When self-calibrating images in flat terrain, errors in the coordinates of points are not felt. When trying to determine the marks of high objects, such as multi-story buildings, unacceptable errors in height occur. Errors in these referencing conditions can be avoided by performing a two-tier survey with joint processing of images. The article presents the results of experimental studies of the features of two-tier surveys from heights of 110 and 90 meters. The article discusses the technologies used in creating topographic plans. A study of the self-calibration technique of images in flat terrain is carried out. Practical conclusions are made on the possibility of using the two-tier aerial photography method to create orthophotoplans.
two-stage aerial photographing, unmanned aerial vehicle, DZ materials, calibration
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