A River Cross Section Survey by UAV Photogrammetry in Lam Pa Chi River, Kanchanaburi Province
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Abstract
This study was to survey the river cross sections in Lam Pa Chi river, Dan Makham Tia Subdistrict, Dan Makham Tia District, Karnchanaburi Province. Almost of study areas are agricultural. The length of the Lam Pa Chi river used in the study was approximately 1 km. and the width range between the left bank and the right bank is about 23 - 40 m. The aerial imagery data from UAV were collected with the overlap distance is 80% and the side lap is 70% of the aerial imagery data. The data collection of 23 ground control points and 5 river cross sections were surveyed by real time kinematics method. The aerial imagery was then processed using 4 different ground control points such as the use of ground control points in total of 4, 8, 16 and 23 points, respectively. The effect of the number of ground control points was subsequently analyzed on the positioning accuracy of the obtained digital surface models in each case. The comparison between the river cross section obtained from the digital surface models and the river cross sectional survey results obtained from the real time kinematics method in each same position were carried out. The results found that the river cross section obtained from the digital surface model with the highest accuracy is the use of 23 ground control points with an average root mean square error of 0.56 m., and NSSDA standard at a 95% confidence level, the average is 0.82 m., followed by the use of ground control points in total of 8, 16 and 4 points, respectively.
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