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| Application of the UAV remote sensing technology in soil and water conservation monitoring in construction projects: A case study of water resources allocation for the region of north Hubei |
| ZHANG Yawen, XU Wensheng, HAN Pei, SHEN Shengyu, WANG Zhigang, ZHANG Pingcang |
| Division of Soil and Water Conservation, Changjiang River Scientific Research Institute, 430010, Wuhan, China |
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Abstract [Background] The Unmanned Aerial Vehicle (UAV) remote sensing is a new technology for soil and water conservation monitoring. It fills the gap between satellite remote sensing and surface observation, which provides a flexible method for users. However, as to combine this new technology with the criterion and specification in soil and water conservation monitoring in construction projects, more practices are needed. [Methods] We conducted a case study for the application of UAV remote sensing technology in soil and water conservation monitoring. This case study was based on a practical construction project called "Water Resources Allocation for the Region of North Hubei" and was divided into three parts: the acquisition of basic remote sensing data, the extraction of monitoring information and the application of information in monitoring work. First, we took the aerial images of some typical regions of the project, then using the software Agisoft Photoscan Professional, we processed the raw data to generate two products, the Digital Elevation Model (DEM) and Digital Orthophoto Map (DOM) for each region. Finally, based on the criterion and specification in soil and water conservation monitoring in construction projects, the application of extracted information from the DEM and DOM results aims to apply effective information into practical monitoring work [Results] The result showed that horizontal resolutions for all the DOM were less than 0.05 m and those for all the DEM were less than 0.2 m. The computer automatic classification was much faster than visual interpretation for classifying the land cover type. However, the computer automatic method had some problems of misclassifying the shadow of the water soil and coverings into vegetation. Based on the UAV method, the disturbed production and living areas in construction project for the exit of Jihong Tunnel, the entrance of 16th section, the 1th and 2th disposal area in the 16th section were 16 562.2 m2, 5 153.8 m2, 4 268.6 m2 and 19 108.5 m2, respectively. The volume of the 1th and 2th disposal area in the 16th section was 11 thousand m3 and 172 thousand m3. The 1th and 2th temporary cover area of the 1th disposal area in the 16th section was 166.9 m2 and 1 229.9 m2, respectively. Compared to the statistical results of the construction organization, the monitoring values based on the UAV and the traditional methods were mostly controlled in 10% of the difference, meeting the relevant requirements. However, the monitoring efficiency of the UAV WAS three to five times of that by the traditional methods. [Conclusions] These monitoring information are all required by the criterion and specification in soil and water conservation monitoring in construction projects. Therefore, by applying UAV remote sensing technology in soil and water conservation monitoring, we may acquire some essential information quickly and easily. Our study shows the feasibility of this method and also reveals that compared to traditional monitoring methods, the information extracted by this method are more accurate and can also save the monitoring cost and improve the monitoring efficiency.
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Received: 21 September 2016
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