The basic task of dual-image analytical photogrammetry is to obtain the coordinates of corresponding ground points through image points. What are the implementation methods?

The basic task of dual-image analytical photogrammetry is to obtain the coordinates of corresponding ground points through image points. What are the implementation methods? As follows:

The two key technologies of photogrammetry are realized in the following three stages:

1. Simulation photogrammetry: The first key technology is to simulate the photographic process indoors by optical or mechanical methods, including restoring the spatial orientation, posture and relationship of photos during the photographic process, establishing the actual reduced model, that is, the geometric inversion of the photographic process, and then measuring on the surface of the model. The second key technology is the research and development of measuring equipment, mainly including analog plotter and other equipment.

2. Analytical photogrammetry: The first key technology is the accurate method of measuring points in a large range. The commonly used adjustment models include navigation belt method, independent model method and beam method. The second key technology is to use digital image, realize various numerical, graphic and image processing with digital photogrammetry system on computer, and study the geometric and physical characteristics of the target, so as to obtain various forms of digital products and visual products.

3. Digital photogrammetry: The first key technology is to obtain image data, and use specific photographic equipment (such as aerial camera, unmanned aerial vehicle or ground camera) to carry out photography tasks, so that large-area images can be obtained. The second key technology is to process these image data, including measuring the position and direction of feature points, and using these parameters to calculate three-dimensional coordinates and draw maps.

Then, computer image processing software is used to carry out various numerical, graphic and image processing to study the geometric and physical characteristics of the target, so as to obtain various forms of digital products and visual products.

With the development of technology, photogrammetry has gradually shifted from traditional manual operation to automation and digitization. For more information, it is recommended to consult a professional.