Brief introduction of analytical photogrammetry

Photogrammetric encryption of control points is one of the main contents of photogrammetry. In the past, the encryption of control points mainly used graphic method or optical mechanical method. With the development of computer industry, computers are also used in surveying and mapping calculation, and now analytical aerial triangulation is used to encrypt control points. According to a few ground control points, the mathematical models of projection beam, unit model or strip model and area model are adjusted and calculated according to the principle of least square method, and the ground coordinates of each encryption point are solved. Analytic aerial triangulation can be divided into two types according to the encrypted area: single-band method and regional network method.

The technology of measuring points, drawing or aerial triangulation by analyzing the information obtained by cameras or other sensors.