UAV indoor photogrammetry processing includes

Indoor photogrammetry processing of UAV includes:

Aerial photography, photo control, image preprocessing, aerial triangulation, DEM/DOM production, topographic map production, UAV aerial photography accuracy analysis.

Detailed explanation of indoor data processing flow of UAV tilt photogrammetry;

First, the office three-dimensional modeling

After the outdoor aerial photography is completed, it is necessary to export the data in time and then transfer it to indoor processing.

(1) data check

It is mainly used to check the flight quality and aerial image quality of aerial photography, such as actual image overlap, image tilt and rotation angle, route curvature, shooting area coverage, image clarity, image point displacement and so on. If the inspection content can't meet the requirements of industry norms and operation tasks, the flight plan should be re-formulated according to the actual situation, and the flight should be made up or re-flown.

(2) empty three encryption

At present, in the process of indoor data processing of UAV tilt photogrammetry, the method of combined adjustment of regional network by beam method is usually used, which is also called combined adjustment. The basic principle of joint adjustment is to adjust the data obtained by two different observation methods, and take the coordinate data of control points and POS attitude data of photos as the initial values of external orientation elements of joint adjustment.

(3) Establishment of 3D model of real scene.

Based on the original images and aerial photography results, 3D models and derived data, including DOM, DSM (including DEM) and dense point clouds, can be generated by using office processing software such as Pix4Dmapper.

Second, industry data collection

After the real 3D model is made, the accuracy of the model should be checked by using image control points and checkpoints. After the accuracy of the model meets the requirements of relevant specifications, the relevant data acquisition platform is used to collect terrain data, and the operation mode is "inside first and then outside".

Third, the output of the results.

According to the requirements of the project, check the collected data, then make data with software, then integrate them into FDB format results, and finally save them as DWG or DXF format files for output.