What are the coordinate systems commonly used in photogrammetry?

The coordinate systems commonly used in photogrammetry are as follows:

1, image plane coordinate system (o-xy): Cartesian coordinate system representing the position of image points in the image plane.

2. Image space coordinate system (s-xyz): a space rectangular coordinate system that represents the position of image points in the image space. It can represent the position of an object point, but it is mainly used to represent the spatial position of an image point. ?

3. Photogrammetric coordinate system (S-XYZ): A spatial rectangular coordinate system, which represents the spatial position of ground points or image points.

4. Ground auxiliary coordinate system (O T -X T Y T Z T): transitional ground coordinate system. The photogrammetry results are all expressed in the ground auxiliary coordinate system.

5. Geodetic coordinate system (O-X G Y G Z G): describes the spatial position of ground points. Geodetic coordinate system refers to a left-handed space system composed of Gaussian plane coordinates and elevation. The result of photogrammetry is finally converted into this coordinate system.

Photogrammetry is to obtain the shape, size, position, characteristics and their relationship of objects by processing the photos obtained by optical cameras. The main task of photogrammetry is to make topographic maps of various scales, establish topographic databases, provide spatial basic data for various geographic information systems, land information systems and various projects, and serve non-topographic fields, such as industry, architecture, biology, medicine and archaeology.

Characteristics of photogrammetry

(1) Get the information of the object without touching the object itself.

(2) Reconstruct three-dimensional objects from two-dimensional images.

(3) Ground data acquisition mode.

(4) simultaneously extracting the geometric and physical features of the object.