Indoor photogrammetry processing of UAV includes (

Indoor photogrammetry processing of UAV includes indoor three-dimensional modeling and indoor data acquisition.

First, the office three-dimensional modeling:

1, data check:

It mainly checks the flight quality of aerial photography and the quality of captured images, such as the actual image overlap, the tilt and rotation angle of photos, the curvature of the route, the coverage of photography, the clarity of images, the displacement of image points, etc. If the inspection content does not meet the requirements of industry norms and operation tasks, the flight plan should be redrafted according to the actual situation, and the flight should be made up or re-flown.

2, empty three encryption:

At present, in the 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 digital point clouds, can be generated by using office processing software such as Pix4Dmapper.

Second, the 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 the relevant specifications, the terrain data are collected by the relevant data acquisition platform, and the operation mode is the production mode from the inside out.

Main tasks and characteristics of photogrammetry:

I. Main tasks:

1. Photogrammetry is a branch of surveying and mapping. Its main task is mapping topographic maps of various scales, establishing digital ground models and providing basic data for various geographic information systems and land information systems. The two major problems to be solved in photogrammetry are geometric positioning and image interpretation. Geometric positioning is to determine the size, shape and spatial position of the object being photographed.

2. The basic principle of geometric positioning comes from the forward intersection method of surveying, which is based on two known photographic stations and two known photographic direction lines, and intersects the three-dimensional coordinates of the undetermined ground points that make up these two photographic rays. Image interpretation is to determine the attributes of the object corresponding to the image.

Second, the characteristics:

1. Photogrammetry measures and interprets images, mainly indoors, without touching the object itself, so it is rarely limited by climate, geography and other conditions; The photographed image is a true reflection of the objective object or target, with rich information and intuitive image, from which people can obtain a lot of geometric and physical information of the studied object.

2. Photogrammetry can take instantaneous images of dynamic objects and complete the measurement work that is difficult to achieve by conventional methods; Suitable for large-scale topographic mapping, with high speed and efficiency; The products have various forms, and can produce paper topographic maps, digital line drawings, digital elevation models, digital orthophoto maps, etc.