Digital Elevation Model (DEM) data for the Conwy estuary, Wales

The Digital Elevation Model (DEM) domain includes the tidally influenced Conwy estuary, downstream of the Cwmlanerch river gauge on the River Conwy and extending offshore into Conwy Bay and the Menai Strait at the coastal boundary. A number of sources were combined to generate the land elevation data, including (a) seabed bathymetry, (b) land elevations and (c) location and heights of existing flood defences. The domain topography was based on the marine DEM, Lidar Digital Terrain Model (DTM) and Ordnance Survey Terrain 5m DTM. The Lidar DTM data was used to check and, where necessary, augment the flood defences vector database.

数字高程模型（DEM）领域涵盖了受潮汐影响的康威河口区域，该区域位于康威河Cwmlanerch河段下游，并延伸至海岸线处的康威湾和曼恩海峡。生成陆地高程数据的过程中，综合了多个数据源，包括（a）海底地形测量数据，（b）陆地高程数据以及（c）现有防洪设施的位置和高度。该区域的地形拓扑结构基于海洋DEM、激光雷达数字地形模型（DTM）和官方地形调查5米DTM。激光雷达DTM数据用于核对并，在必要时，补充防洪设施矢量数据库。