| At present,the oblique photogrammetry technology of UAV is gradually replacing manual modeling and becoming a key technology due to its advantages of high efficiency,high precision,high realism,and low production cost.And with the development of 3D GIS technology such as monolithic,the oblique photography real 3D is no longer the “a skin with remote sensing images of elevation information” in the past.It can provide geographic information and attribute information at the same time and it is gradually widely used by land,planning,urban management,resources and other departments.In the process of 3D modeling of oblique photography,production efficiency is undoubtedly the first issue that producer should consider.For a given 3D modeling task of oblique photography,the producer often formulate the flight plan based on experience,but cannot fundamentally explain the reason for the plan.In order to clarify the internal relationship between some common factors that affect production efficiency and efficiency,this article takes the principle of control variable as the principle and explore the internal relationship between the three factors and production efficiency through Context Capture software,including the original image of different images with different resolutions,the original images of different flying platforms and the number of different server nodes.Then according to the results of different data,a trend chart is drawn to draw some basic conclusions and provide a reliable basis for the correct formulation of the flight plan in actual production in the future.This article starts research from the following aspects:(1)The theoretical basis of tilt photogrammetry technology is introduced in detail,including the characteristics,principles,limitations of the tilt photogrammetry technology,three-dimensional modeling method research and key technologies involved in the entire process of tilt photogrammetry.Among them,it introduced commonly used algorithms of distortion correction,uniform color treatment and multi-view image dense matching focusly.(2)The oblique photogrammetry system based on UAV is elaborated in detail,including the introduction of the flight platform for tilt photography,the selection of tilt camera,the setting of route plan and the introduction of Context Capture 3D modeling software.(3)Analyze the factors that affect the efficiency of 3D modeling of tilt photography from the theoretical basis of data sources,software and hardware,and design from three common factors of original images with different image resolutions,original images with different flight platforms,and the number of different server nodes and explore the internal relationship between it and efficiency respectively in order to provide theoretical basis and practical guidance for production personnel to formulate flight plans. |
