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Comprehensive analysis of flying altitude for high resolution slope mapping using UAV technology

Yusoff, Ahmad Razali and Darwin, Norhadija and Majid, Zulkepli and Ariff, Mohd. Farid and Mohd. Idris, Khairulnizam (2018) Comprehensive analysis of flying altitude for high resolution slope mapping using UAV technology. In: 2018 Geoinformation for Disaster Management Conference, Gi4DM 2018, 18 March 2018 through 21 March 2018, Istanbul Technical University Istanbul, Turkey.


Official URL: http://dx.doi.org/10.5194/isprs-archives-XLII-3-W4...


Unmanned Aerial Vehicle (UAV) is one of the geoinformation data acquisition technologies that popularly used for slope mapping. UAV is capable to produce high resolution imageries in a short period. In order to obtained suitable results in slope mapping, specific UAV mapping factors have to be followed and the selection of the optimum Ground Control Point (GCP) and the UAV flying altitude become the most important factors. This paper presents the production of high resolution slope map using UAV technology. The research involved with the following steps, (i) preparation of field work (i.e. determination of the number of GCPs and flying altitude) and the flight mission; (ii) processing and evaluating of UAV images, and (iii) production of slope map. The research was successfully conducted at Kulim, Kedah, Malaysia as the condition of slope in that area is prone to the landslide incidences. A micro rotary wing UAV system known as DJI Phantom 4 was used for collecting the high resolution images with various flying altitudes. Due to the un-accessibility of the slope area, all the GCPs are measured from the point cloud data that was acquired from the Pheonix AL-32 LiDAR system. The analysis shows that the coordinates (X, Y and Z) accuracy is influenced by the flying altitude. As the flying altitude increases, the coordinate’s accuracy also increased. Furthermore, the results also show that the coverage slope area and number of tie point increases when the flying altitude increases. This practical study contributed to the slope work activities where the specific requirements for flying altitudes have been clearly stated.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:flying altitudes, ground control point (GCP), high resolution imagery, 3D slope mapping, UAV
Subjects:G Geography. Anthropology. Recreation > G Geography (General)
Divisions:Geoinformation and Real Estate
ID Code:81929
Deposited By: Yanti Mohd Shah
Deposited On:30 Sep 2019 21:04
Last Modified:30 Sep 2019 21:04

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