SMMS: Bathymetry (WMS)

Definition:
‘Bathymetry’ means the measurement of the topographical shape of the bottom of a body of water. The term is also often used – analogously to the word ‘topography’ – as a synonym for the shape of the bottom of the water. Waters in this context are seas, rivers or closed inland waters. Within the framework of the SMMS project, bathymetric data sets are those that represent the height distribution in the German Bight including the estuaries of the Ems, Weser and Elbe. Due to morphological activities of the aquatic soil, such a bathymetric model is only valid for a certain period or time.

Data generation:
The basis for bathymetric products are gridded bathymetric models, which are created using the Functional Soil Model, a data-based hindcast simulation model, using spatiotemporal interpolation methods from a database of sea and land surveys of various data types. For the years 1960-2020, a rasterized bathymetric model in 10 m resolution is provided for the German Bight.

Product:
A 10 m grid of the German Bight valid on 01.07. for the year, whereby the height is stored at each grid node. The product is provided in GeoTiff format along with source maps (before and after, shapefiles). The bathymetries are related to the EasyGSH-DB project, but cover a longer period of time.

Service:
The service visualizes selected years from the SMMS research period.

定义：
水深测量（Bathymetry）指对水体底部地形形态的测量。该术语常类比于“地形学（topography）”一词，用作水体底部形态的同义词。此处所指的水体包括海洋、河流及封闭内陆水域。在SMMS项目框架下，水深测量数据集指涵盖德国湾（含埃姆斯河、威悉河与易北河河口）的底部高度分布数据。由于水生底床存在形态活动，此类水深测量模型仅在特定时段内有效。

数据生成：
水深测量产品的基础为网格化水深模型。该模型基于功能土壤模型（Functional Soil Model）——一种基于数据的后报模拟模型——通过时空插值方法，整合各类数据类型的海陆勘测数据库构建而成。针对1960年至2020年的时段，研究团队为德国湾提供了分辨率为10米的栅格化水深模型。

产品：
该产品为对应年份7月1日生效的德国湾10米网格数据，每个网格节点均存储有底部高度值。产品以GeoTiff格式提供，并附带前后对比源地图及shapefiles。本产品与EasyGSH-DB项目相关，但覆盖的时间跨度更长。

服务：
该服务可可视化展示SMMS研究周期内的选定年份数据。