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Vol.44, No.4, PP.271-362
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1
Improvement of LiDAR Data Accuracy Using 12 Parameter Affine Transformation
44(4):293-301
Chien-Ting Wu[1]* Cheng-Yang Hsiao[2] Chun-Sung Chen[3]
* Corresponding Author. E-mail : Kenwu@uch.edu.tw
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Improvement of LiDAR Data Accuracy Using 12 Parameter Affine Transformation
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Chien-Ting Wu[1]* Cheng-Yang Hsiao[2] Chun-Sung Chen[3]

Abstract
LiDAR data in a local coordinate system may need to be georeferenced and converted into a geographic or projected system. In coordinate transformation, the 7-parameter Helmet
transformation method is usually used in measurements to eliminate the systematic errors made by a laser scanner. However, 7-parameter coordinate transformation assumes that there is only one scale error in all of the systematic errors. This study used 12 parameter affine transformation for coordinate transformation of airborne LiDAR data and terrestrial LiDAR data. The LiDAR data accuracy results
upon 6-parameter similarity transformation, 7-parameter similarity transformation, and 12-parameter affine transformation were compared. The results showed that using 12-parameter affine transformation the airborne LiDAR and terrestrial LiDAR data have 2-3 times greater accuracy than do 7-parameter or 6-parameter transformations.
Key Words : LiDAR, coordinate transformation, 12-parameter, affine transformation.
Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C.
Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Inc.
Department of Geomatics, Chien Hsin University of Science and Technology, Taoyuan County, Taiwan, R.O.C.
* Corresponding Author. E-mail : Kenwu@uch.edu.tw
Received: 2012/08/13
Revised: 2012/09/11
Accepted: 2013/07/22
2
The Influence of Macro-Sediment from Mountainous Areas on the River Morphology in the Heshe River
44(4):302-310
Su-Chin Chen[1] Pei-Yu Shin[1] Chun-Hung Wu[2]* Yi-Chiung Chao[1]
* Corresponding Author. E-mail : chhuwu@fcu.edu.tw
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3
Sediment Influence Associated with Extreme Events on the Channel Pattern in the Chenyoulan River
44(4):311-323
Su-Chin Chen[1] Pei-Yu Shin[1] Chun-Hung Wu[2]*
* Corresponding Author. E-mail : chhuwu@fcu.edu.tw
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4
A Study of Using Cluster Analysis to Improve Parameters Prediction of van Genuchten Model
44(4):324-334
Li-Ling Lin[1] Wei-Chu Chen[1]* Ke-Wei Lin[2] Shun-Ping Tsao[2]
* Corresponding Author. E-mail : willy19881212@hotmail.com
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5
Effects of Climate Change on the Potential of the Landslides in the Basin of Kaoping Stream
44(4):335-350
Jen-Chen Fan Chih-Hsiang Yang Shih-Chun Chang* Hsiao-Yu Huang Jia-Jun Guo
* Corresponding Author. E-mail : d95622009@ntu.edu.tw
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6
A Computational Model of Sediment Control for Soil and Water Conservation Engineering
44(4):351-362
Hui-Pain Lien I-Ta Tsai *
* Corresponding Author. E-mail : ittsai@fcu.edu.tw
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7
Channel Evolution Conceptual Model Associated with Dam Removal at Chijiawan Creek
44(4):271-281
Hsiao-Wen Wang* Wei-Cheng Kuo Chia-Hao Chang
* Corresponding Author. E-mail : whw82@mail.ncku.edu.tw
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8
Estimation on Behavior of Slopeland Disaster and Sediment Distribution and Variation using Digital Aerial Photogrammetry
44(4):282-292
Yu-Shu Lin* Hsueh-Cheng Ho Miau- Bin Su
* Corresponding Author. E-mail : yushu0523@gmail.com
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