期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2010
卷号：XXXVIII - Part 7B
页码：92-97
出版社：Copernicus Publications
摘要：The Dutch coast is characterized by sandy beaches .anked by dunes. Its morphology is essential for the defense against .ooding of the hinterland. Therefore it is monitored on a yearly basis by Airborne Laser Scanning (ALS). However, it is recognized that most erosion of the beach and first dune row takes place during storms. To assess the state of the coast immediately after a storm with ALS is expensive and difficult to organize. Here, the performance of a Land-based Mobile Mapping System (LMMS) is evaluated. A test data set was obtained by Geomaat using the StreetMapper LMMS system, employing three individual line scanners. Both the relative quality of laser point heights and of a derived Digital Terrain model (DTM) are assessed. In the first analysis height differences between close-by points are considered. Except for arbitrary close-by points, also close-by points obtained from different scanners and from different drive-lines are analyzed. It is shown that on a .at beach a precision of 3 mm is achieved and that almost no internal biases exist. In the second analysis a DTM with a grid size of 1 m is obtained using least squares. Each grid point height includes a quality description, which incorporates both measurement precision and terrain roughness. Although some problems remain with the low scanning height of 2 m, which causes shadow-effect behind low dunes, it is concluded that a laser LMMS enables the acquisition of a high quality DTM product, which is available within two days
