Abstract
A new technology Unmanned Aerial Vehicles (UAV), is increasingly used by land surveyors for various applications. CV software for processing drone images has made great strides in making it easier to use and reducing the need for human intervention. CV method relies on tie point extraction from a set of overlapping images, which used to generate a model for the area of interest. However, using this technique to process large areas at an acceptable resolution requires huge photos and significant computer resources. Therefore, this study aims to assess the measurement accuracy that can be obtained from a single UAV image, taking into account the accuracy and time consumption. Firstly, the multirotor UAV was used to capture the ground at a certain altitude. Then the data were processed using two software packages. The outcomes of both software were compared against actual data for accuracy assessment. The results show that both processing methods provide excellent accuracy result; the ground resolution is within the range of 0.2~3.7cm\pixel, which comply with international standards. In conclusion, this study demonstrates the feasibility of using high accuracy UAV image to extract the measurement of a flat area with reliable accuracy in a short time.
Highlights
In conventional engineering survey works, topography information was obtained from land survey using Total Stations and GPS or more advanced technologies such as Global Navigation Satellite Systems (GNSS), Terrestrial Laser Scanning (TLS), and light detection and ranging (LIDAR) [1,2]
The data acquired by Unmanned Aerial Vehicles (UAV) are ideal for proceeding by different software packages: software like AgiSoft and MATLAB were used in this study
The images were processed with two software packages AgiSoft PhotoScan and MATLAB
Summary
In conventional engineering survey works, topography information was obtained from land survey using Total Stations and GPS or more advanced technologies such as Global Navigation Satellite Systems (GNSS), Terrestrial Laser Scanning (TLS), and light detection and ranging (LIDAR) [1,2]. UAV shortens the time that has to be spent in conducting surveys in the field from several days to a few hours [4]. It increases the safety of people performing measurements as an operator can be out of a dangerous zone. The high-resolution photos taken by the UAVs are able to obtain metric information on the Earth’s surface [6]. [7] Indicated the capability of drone images for data collection and the precise measurement of road applications
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