TY - JOUR

T1 - Morphologic change detection in the Wadden Sea from lidar data

AU - Brzank, Alexander

AU - Heipke, Christian

AU - Goepfert, Jens

PY - 2008

Y1 - 2008

N2 - Morphologic change detection in the Wadden Sea is an important task in the context of coast protection. Commonly, lidar data is used to calculate a Digital Terrain Model (DTM). In order to detect and evaluate morphologic changes of the surface, a difference model is determined from the DTM of two epochs. Erosion and accumulation refer to significant positive and negative differences. Usually, erosion and accumulation processes are not independent of each other but occur due to shifts of tidal channels. The analysis of these shifts and the change of the trenches are rather difficult to evaluate if only the difference model is available. Within this paper, a new method to detect and analyse morphologic changes in the Wadden Sea is presented. The idea is based on the extraction of the bank lines of the tidal channels in both epochs. The four bank lines of a trench represent its skeleton and can be used for deriving geometrical parameters such as the channel bed width. Based on the extracted bank lines and the parameters of both epochs the changes of the tidal channels can be determined and evaluated. In order to demonstrate the capability of the proposed change detection method, a representative area of the Wadden Sea, which was captured by lidar in 2005 and 2007, is evaluated. It is shown that neighbouring erosion and accumulation processes are often caused by shifts and changes in size of a tidal channel. With the help of the extracted bank lines and the geometrical parameters these changes can be detected and evaluated in an elegant way.

AB - Morphologic change detection in the Wadden Sea is an important task in the context of coast protection. Commonly, lidar data is used to calculate a Digital Terrain Model (DTM). In order to detect and evaluate morphologic changes of the surface, a difference model is determined from the DTM of two epochs. Erosion and accumulation refer to significant positive and negative differences. Usually, erosion and accumulation processes are not independent of each other but occur due to shifts of tidal channels. The analysis of these shifts and the change of the trenches are rather difficult to evaluate if only the difference model is available. Within this paper, a new method to detect and analyse morphologic changes in the Wadden Sea is presented. The idea is based on the extraction of the bank lines of the tidal channels in both epochs. The four bank lines of a trench represent its skeleton and can be used for deriving geometrical parameters such as the channel bed width. Based on the extracted bank lines and the parameters of both epochs the changes of the tidal channels can be determined and evaluated. In order to demonstrate the capability of the proposed change detection method, a representative area of the Wadden Sea, which was captured by lidar in 2005 and 2007, is evaluated. It is shown that neighbouring erosion and accumulation processes are often caused by shifts and changes in size of a tidal channel. With the help of the extracted bank lines and the geometrical parameters these changes can be detected and evaluated in an elegant way.

KW - Change detection

KW - Coast

KW - Extraction

KW - Lidar

KW - Monitoring

UR - http://www.scopus.com/inward/record.url?scp=84942373700&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:84942373700

VL - 37

SP - 647

EP - 652

JO - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives

JF - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives

SN - 1682-1750

T2 - 21st International Congress for Photogrammetry and Remote Sensing, ISPRS 2008

Y2 - 3 July 2008 through 11 July 2008

ER -