| Title |
An Accuracy Evaluation of Algorithm for Shoreline Change by using RTK-GPS |
| Authors |
이재원(Lee, Jae One) ; 김용석(Kim, Yong Suk) ; 이인수(Lee, In Su) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.1D.081 |
| Keywords |
해안선;자동추출;항공 Lidar shorelines;RTK-GPS;automatic change extraction;airborne lidar |
| Abstract |
This present research was carried out by dividing two parts; field surveying and data processing, in order to analyze changed patterns of a shoreline. Firstly, the shoreline information measured by the precise GPS positioning during long duration was collected. Secondly, the algorithm for detecting an auto boundary with regards to the changed shoreline with multi-image data was developed. Then, a comparative research was conducted. Haeundae beach which is one of the most famous ones in Korea was selected as a test site. RTK-GPS surveying had been performed overall eight times from September 2005 to September 2009. The filed test by aerial Lidar was conducted twice on December 2006 and March 2009 respectively. As a result estimated from both sensors, there is a slight difference. The average length of shoreline analyzed by RTK-GPS is approximately 1,364.6 m, while one from aerial Lidar is about 1,402.5 m. In this investigation, the specific algorithm for detecting the shoreline detection was developed by Visual C++ MFC (Microsoft Foundation Class). The analysis result estimated by aerial photo and satellite image was 1,391.0 m. The level of reliability was 98.1% for auto boundary detection when it compared with real surveying data. |