Application of UAV Photogrammetry on Ecological Restoration of Abandoned Open-pit mines, Northern Anhui Province, China

Hongbao Dai,Jiying Jiying

doi:10.46488/nept.2022.v21i01.021

Abstract

Mine survey is an important part of the ecological restoration design of an abandoned open-pit mine because it gives precise survey data for mine management. Unmanned aerial vehicle (UAV) photogrammetry technology is applied to mine 3D modeling and earthwork calculation to tackle the problems of high cost, low efficiency, and high labor intensity in traditional manual field mine surveys. Using the abandoned quarries in Baitu, Suzhou City, as the study area, 82 ground control points were set up, and massive elevation data of the ground was obtained using a Dajiang spirit 4 RTK UAV for aerial photography and extracted from a 3D model created with Context Capture software, while a digital orthophoto image of the study area was created. The earthwork volume is calculated using the square grid method. UAV photogrammetry has a considerably higher efficiency than typical manual field measurement results, and it meets the precision criteria of mine geological environment assessment. According to the findings, UAV photogrammetry technology has a promising future in mine geological environment monitoring and ecological environment repair.

Highlights

In recent years, Unmanned aerial vehicle (UAV) technology has become widely used in a variety of fields, in engineering geology research, including basic theory research (Xing et al 2011, Shan et al 2013), rock discontinuity investigation (Salvini et al 2020), underground tunnel mapping (Wirachman et al 2010), slope stability analysis (Wang et al 2019), and landslide deformation monitoring
The calculated results of MS and MH for the study area are 0.083 m and 0.069 m respectively, indicating 3D modeling meets the accuracy requirements, which can be used for earthwork calculation
Based on the manual measurement data and 3D model measurement data, the volume of earthwork was calculated by the square grid method (Liu et al 2020)

Summary

INTRODUCTION

Mineral resources are the material basis of human economic and social development, and the “food” and main power source of industry, agriculture, national defense, and other social industries (Zhai & Hu 2021). The foundation of abandoned mine restoration, land reclamation, and mine green sustainable development is mine ecological environment repair. The traditional manual field mine survey approach, which employs a total station and GPS technology, has drawbacks such as expensive costs, long lead times, and vulnerability to the field environment, among others (Jie et al 2018). The key difficulty in the field of mine survey is how to lower costs while maintaining high quality and efficient access to geometric information and physical properties of mining areas. There are few studies on ecological restoration of abandoned open-pit mines using UAV photogrammetry. The study’s goal was to see if UAV photogrammetry might be used to help with open-pit mine ecological restoration. Extract relevant geometric and physical information, all based on the basic principle of photogrammetry (Lin et al 2018, Wang et al 2020). The image-object relationship model is constructed based on the collinear relationship of the image point, photogrammetry center, and object point (Qiang & Tian 2019)

MATERIALS AND METHODS

RESULTS AND DISCUSSION

Evaluation

CONCLUSION