Research On Application Of UAV Oblique Photogrammetry Technology In Building Real 3D Model Of Urban

At present,with the advent of drone tilt measurement technology,the efficiency of constructing urban true three-dimensional models based on tilted images has been improved to some extent.However,the cost and technical threshold for oblique Photogrammetry by drones is still relatively high compared to the use of consumer-grade drones to capture oblique images.Due to its low price,ease of operation,lack of licenses,and application for airspace,consumer-grade drones have gradually become a new type of platform for rapidly acquiring optical images on the ground.Second,the continuous improvement of computer hardware functions and the continuous advancement of computer vision technology and parallel computing technology have enabled rapid and dense matching of massively disordered and multi-resolution images.In addition,with the continuous advancement of 3D reconstruction software such as Context Capture and Photoscan,it has been possible to automatically construct 3D models using images captured by single-lens drones or even mobile phones.Based on the above points,this article explores a method for acquiring oblique image data using a single-lens multi-rotor consumer drone.Using Altizure ground control system and Pix4 d Mapper 3D modeling software,combined with a small amount of manual intervention,quickly constructed Real 3D model of the experimental area.The experimental results meet the accuracy requirements,improve the efficiency of 3D modeling,and reduce the economic costs and technical requirements of 3D modeling.This not only provides a new idea for the three-dimensional modeling of small areas,but also facilitates the extensive application and promotion of oblique Photogrammetry technology.The following is the main research content of this article:(1)Introduced the principle of tilt photography measurement technology in detail and many key technologies based on UAV oblique Photogrammetry technology to build real3 D models of cities,such as multi-view image preprocessing,regional network joint adjustment,multi-view image feature extraction,multi-view image matching,texture mapping,etc.(2)Researched the principle and method of tilt-based photogrammetry based on consumer drones.The components of the consumer-class drone system,the consumer-level drone ground control system,and the three-dimensional modeling system were introduced.In addition,the method and requirements for layout of photo control points for consumer-grade drones have also been studied and how to calculate the flight parameters.(3)A real 3D model of the library area in Shangrao City,Jiangxi Province was established using oblique images acquired by consumer-grade drones.The accuracy of the real city 3D model constructed by this method is systematically analyzed and studied from three aspects: the fineness of the model,the geometric accuracy of the model,and the representative line segment accuracy in the model.