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Case History 4

Marine grid survey

Survey Description

Date                                           December 2002

Location                                      N. Baltic Sea

Survey vessel                              10,000 T Navy vessel

Survey description                       Grid survey        

Length of lines                             NS: 100 kms   EW: 115 kms

Line spacing                                Approx. 10 kms

Number of lines                            NS: 8               EW: 6

Number of intersections                 54

Cruise speed                                10 to 12 knots  (5.1 to 6.2 m/sec)

Sea state                                     4/5 (wave height 2.5 to 3.0 m)

 

Results

Processing                                   First order level and drift removed

Filter                                            86 sec

Spatial resolution                           3.75 km

RMS error from mean                     0.22 mGals

 

Text Box: Fig. 2   Free-air gravity;  RMS error 54 intersections:  0.22 mGals.   (Data restricted – not available for release).    Text Box: Fig. 1   Survey lines (N up). Text Box: RESTRICTED Text Box: RESTRICTED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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