Bathymetry

The articles hydrography , water surveying and bathymetry overlap thematically. Help me to better differentiate or merge the articles (→ instructions ) . To do this, take part in the relevant redundancy discussion . Please remove this module only after the redundancy has been completely processed and do not forget to include the relevant entry on the redundancy discussion page{{ Done | 1 = ~~~~}}to mark. W! B: ( discussion ) 08:36, Aug 21, 2014 (CEST)

As bathymetry (from the Greek. Βαθύς Bathys "low" and μέτρον métron "dimension") is defined as the measurement of topographical shape of the water beds , sea beds , as well as, for example, Seegründe . As a branch of hydrography and geodesy , bathymetry is used to generate terrain models and maps from which the depth profile of the oceans can be seen.

The most important tool of bathymetry is the echo sounder , especially the fan-shaped echo sounder , which is preferably used to measure the sea floor. However, since this measurement method is comparatively complex, a technology has recently been tested to obtain nautical charts from the data of radar satellites. These radar satellites can only image the surface of the water. Due to the gravity anomalies of submarine elevations and mountain ranges, the water level at these points is on average a few centimeters higher than at lower points. The water depth can be derived from precision measurements of the mean sea level.

Bathymetric map

A bathymetric map is a map of the sea floor or a lake with depth numbers, contour lines and possibly colored depth layers. The depth information is mostly related to a uniform reference level (e.g. sea chart zero ) to which the measured depth values are loaded .