When linear CCD is used in large-scale measurement, why introduce the third CCD?

The principle and error of EFP beam aerial triangulation method can be used to measure CCD images and estimate the elevation error of satellite photogrammetry without ground control points.

The theory and simulation results of satellite photogrammetry of three-line array CCD images using linear CCD are systematically expounded. The contents include the principle and error characteristics of EFP beam aerial triangulation of three-line array CCD images, the elevation error estimation of satellite photogrammetry without ground control points, the establishment of three-dimensional model of three-line array CCD images on short routes and the three-dimensional mapping of three-line array CCD images.

CCD (Charge Coupled Device) is a new type of semiconductor integrated photoelectric device developed in the early 1970s. According to the arrangement of photosensitive units, CCD devices can be divided into linear CCD and area CCD.