A professional digital photogrammetry system is used to process aerial remote sensing images, obtain the original position and attitude of the images, and form a stereo image pair through the correlation of adjacent images. Then software and professional hardware equipment are used to track the 3D in the 3D visual formation, collect the 3D data, and then import the map editing system for editing, and finally obtain vector geographic information, that is, digital line mapping (DLG).

Tengger Desert Project 1:1000 scale DLG