Digital outcrop based on 3D modeling of UAV oblique photography and its application in profile measurement and research:A case study of Xiaheyan profile in Zhongwei,Ningxia
Traditional field surveys cannot study the profile from an overall and global perspective;field surveys are greatly affected by terrain fluctuations,making it challenging to measure outcrops in high-risk areas.The two-dimensional outcrop geological model built by geologists based on the measured data is challenging to relate closely to the profile in terms of spatial position.This paper analyzes the problems faced by the profile measurement,collects oblique images of outcrops with coordi-nate information and texture features at different altitudes through UAV oblique photography technology,using post-process-ing software to build a 3D model of the outcrop,which has the advantages of comprehensive coverage and high precision of key rock formations in the profile,it can make up for the shortcomings of traditional field profile measurements.In this paper,the profile measurement is combined with the UAV oblique photography 3D modeling technology,and the 3D model of the outcrop is used to assist the profile measurement and research work.The research shows that:① The 3D model of the outcrop has the advantages of real 3D scenes and coordinate information,and can be obtained from any location and angle of the profile re-search,especially in dangerous outcropping areas such as high slopes and cliffs;② The 3D model of the outcrop can plan the actual measurement route of the profile from an overall and global perspective,calibrate the stratigraphic boundaries,record the measured trajectory and important geological observation points and other information ③ Using the outcrop model to have millimeter-level resolution images in the critical rock formation areas,it is possible to clearly and intuitively perform profile stratification,lithology qualitative,thickness measurement and sedimentary cycle analysis;④ It can quickly solve the problem of tracking the strata of high and steep long profiles in the actual measurement of the profile;⑤ For the key boundary line of the stratum,the development of the profile,the contact between groups and the division of the stratum sequence of the profile can be carried out.In summary,applying the 3D model of the outcrop to the actual measurement and research of the profile is of great benefit to the development of profile survey work and the establishment of an outcrop geological knowledge base.
UAVoblique photographyoutcrop 3D modelingprofile measurementXiaheyan
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