Determining the optimal number of ground control points for establishing the digital surface model of Nui Sam quarry Khanh Hoa province
- Authors: Ninh Huu Nguyen 1, Thao Phuong Thi Tran 2, Thanh Van Le 3, Tan Huu Nguyen 4, Vinh Van Nguyen 5
Affiliations:
1 Sở Tài nguyên và Môi trường tỉnh Khánh Hòa
2 Sở Tài nguyên và Môi trường tỉnh Phú Thọ
3 Ban quản lý nhà Tp. Đà lạt
4 Công ty TNHH Tư vấn Xây dựng - Đo đạc Bản đồ Tấn Cường,Tp.Cần Thơ
5 Công ty CP Bất động sản Hà Quang, Khánh Hòa
- *Corresponding:This email address is being protected from spambots. You need JavaScript enabled to view it.
- Received: 2nd-Sept-2021
- Revised: 25th-Sept-2021
- Accepted: 14th-Dec-2021
- Online: 28th-Feb-2022
Abstract:
The Digital Surface Model (DSM) is an important input in open-pit mining. The accuracy of DSM established by Unmanned Aerial Vehicle - UAV technology depends on the number of ground control points (GCPs). In this study, we investigated the influence of the number of GCPs on the accuracy of DSM of Nui Sam quarry (Khanh Hoa province). For this purpose, we established 13 GCPs over the surface, then using the DJI Phantom 4 Pro to capture the quarry surface in 20 April, 2021. The images were processed to creat DSM by using Agisoft Photoscan software. The accuracy of established DSMs is defined by Root Mean Square error (RMS) in the XY, Z and XYZ directions. The results show that, in case of 3 control points, the maximum and minimum RMSzyx error is 27.1 cm and 16.4 cm, respectively. Increasing in the number of GCPs results in the improvement in the accuracy of DSMs and decreases the dependency on the network configuration of the GCPs. It is concluded from experiments that with the number of control points from 06 points, it is possible that the accuracy of the DSM model can be achieved at 7 cm.
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