Photogrammetry
Photogrammetry is a technique in which aerial photographs mapping the terrain are made in stereo.
The aerial recordings are made at predetermined altitudes depending on the quality / accuracy of the objects to be mapped. In addition, the images overlap each other enough to keep the stereo (3D) effect optimal: in the longitudinal direction of the photo flight this overlap is usually 60%, in the transverse direction it is 30%.
Today the air shots are made with digital cameras. This offers many advantages with respect to the image resolution and image quality. A better compensation for the weather conditions (cloud coverage) is thus possible.
The images are then built into a stereoscopic model for stereo rendering: this is called triangulation.
Afterwards it is possible to use special 3D software to view the stereoscopic images and map objects in the field (e.g. housing) in 3D. The results are points and lines in field coordinates and altitudes (x, y, z).
