Application of Oblique Photogrammetry in Traditional Cadastral Survey

May 16, 2023

1. Data Acquisition and Data Processing

The main application of oblique photogrammetry in traditional cadastral surveying is data acquisition and data processing of cadastral surveying data information. Using oblique photogrammetry technology, following the three principles of effective, comprehensive, and precise data collection, first analyze the categories and summarize the data information that needs to be measured in cadastral surveying, so as to avoid the problem of repeated measurement data information, and then Combined with different operation contents of oblique photogrammetry, the contents are assigned to various professional surveyors, which greatly improves the work efficiency and quality of surveyors. The surveyor uploads the relevant data information, and the system automatically files the data content and enters the database for screening, classification, comparison and inspection, and controls the data error within the allowable range to ensure the accuracy of the data.

2. Automatic model building

After the oblique photogrammetry system collects and processes the data, it will automatically model the land resource data information. Oblique photogrammetry data acquisition can not only collect data, but also obtain the data information required in the establishment of land models, conduct comprehensive analysis of all measurement data information, communicate and cooperate with relevant departments in cities and regions, and improve all land related issues. Resource information, including environment, geology, number of times of use, etc., simulates the real situation to establish a three-dimensional coordinate model, so that land resource developers can fully understand the situation of land resources, and formulate reasonable A precise and scientific development plan can improve the living standards of residents and promote the further development of the urban economy.

3. Aerotriangulation and 3D modeling

Aerial three-dimensional encryption is an important technology for processing oblique photographic images. First, it is necessary to input the oblique image with orientation information and ground control data into the system, and automatically match the connection points with the same name in the oblique image. Then detect and eliminate the rough points, then construct the free network, and finally carry out the regional network adjustment. The adjustment model needs to use a more classic multi-camera collinear equation model, such as 3D point cloud, 3D grid, 3D grid with texture or correction sheet DSM.

When performing 3D modeling, it is necessary to use the automatic batch modeling software of oblique photography to perform geometric correction, multi-view matching, joint adjustment, and triangulation network construction on the collected multi-view images. The features are extracted, and the collected information is visualized to obtain the final 3D tilting model.