Die Küste, 81 (2014), 369-392 
376 
The first step was to compile bathymetric data from die different data sources 
(Tab. 2). Fig. 4 illustrates die spatial and temporal distribution of die different batiiymet- 
ric surveys which have been subject to the quality assessment of die hydrographic survey 
requirements; most of diem have been performed in die Elbe, Weser and Ems estuaries 
and, subsequently, within the shallow waters down to 20 m of water depths in different 
time intervals. 
In die next step the bathymetric database was enhanced with relevant metadata in or 
der to describe die survey data in a comprehensive manner. The spatial confidence re 
gion, die temporal confidence interval, the accuracy of measurement and die recom 
mended interpolation method are specified in the metadata for each data set, for example. 
In total, 1.7 billion data from more than 16,000 bathymetric surveys have been com 
piled in this way covering a time span from 1948 to 2012. 
Table 2: Suppliers of bathymetric data. 
Source 
Spatial Extent 
Temporal 
Extent 
BSH 
German North Sea 
1983-2012 
BSH 
Digitized operating sheets of hydrographic surveys for different subareas of 
the German North Sea 
1974-1979 
KFKI-Project 
03KIS308 
Digitized operating sheets of hydrographic surveys for different subareas of 
the German North Sea 
1948-1982 
WSA Bremen 
Weser 
2008-2009 
WS A Bremerhaven 
Weser estuary, Jade Bight 
1996-2009 
WSA Cuxhaven 
Elbe estuary up to the north west of Helgoland 
1990-2012 
WSA Emden 
Ems estuary 
1990-2011 
WSA Tönning 
Channels of the North Frisian Wadden Sea 
1990-2010 
WSA Wilhelmshaven 
Shipping channel of the Jade, area around Spiekeroog and Wangerooge 
1996-2012 
NLWKN 
Northern beach area of Juist and Langeoog 
1983-2007 
LKN-SH 
Base map of the Wadden Sea 
1935-2012 
Landesvermessungsamt Schleswig- 
Holstein 
ALS - data for the Wadden Sea (Schleswig-Holstein) 
2005/06 
British Oceanographic Data Centre 
Digital Elevation Models of the North Sea 
1998, 2008 
Danish Hydraulic Institute 
Digital Elevation Models of the North Sea 
2003, 2009 
Kys tdirektoratet /The 
Danish Coastal Authority 
Danish Wadden Sea, Blavandsh.uk to Hindenburgdamm 
2008 
Senckenberg am Meer, Wilhelmsha 
ven 
Shore face of Spiekeroog 
2003, 2007 
JadeWeserPort Logistics Zone 
GmbH & Co.KG 
jade 
2010