KLIWAS 
Seite 20 
KLIWAS 
Climatology 
of North Sea 
Fronts 
4.2 StatisticalRontProduct 
4.2.1 North Sea Blank 
After the algorithm has been validated and tested the EO data listed in Table 1 have 
been processed. All input data are collocated on a spatial grid that covers the North 
Sea and part of the North East Atlantic. After computation of the gradient magnitude 
and gradient direction, a set of statistical measures was computed for SST and OC 
front products. All input data with the exception of the AVHRR data are collocated 
on a predefined subset with the following properties: 
• horizontal: 
• vertical: 
• size: 
• scale: 
• projection: 
0 - 1273 pixel; 
0 - 1337 pixel; 
1273 x 1337 = 1702001; 
1 km/ pixel; 
UTM Zone 31 WGS1984. 
The AVHRR data was delivered on other subset with the following properties: 
horizontal 1100 pixel; vertical 1000 pixel; size 1100000 pixel; scale ~1 km/pixel; 
projection Mercator. To facilitate comparison the results of the temporal statistics for 
the AVHRR sensor have been collocated on our predefined subset. 
4.2.2 Predefined Bands in Statistical FYont Products - SST& OC 
The ocean bathymetry created by NOAA's National Geophysical Data Center 
(NGDC) is available as static information layer (Amante and Eakins, 2009). 
Furthermore, a static land/water mask has been applied to all input products which 
was derived from the bathymetry data set.