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Case History 9

Helicopter repeat line - offshore

Survey Description

Date                                         December 21, 2002

Location                                    20 km south and 2 km off-shore Perth, WA

Survey vehicle                            Robinson R44 helicopter

Survey description                      N-S repeat line

Length of line                             10 kms

Number of passes                      6

Survey altitude                           278.0 +/- 3.3 m

Ground speed                            23.2 m/sec

Line numbers                             4010 to 4015

Wind speed                               10 to 15 knots

 

Results

Saturations/line (average)             Fine channel: 54                Coarse channel: 0

Processing                                 First order level (offset) and drift removed

Filter                                          110 sec

Spatial resolution                        1.28 km

RMS error from mean                  0.58 mGals

 

 

Text Box: 10         5           0 Text Box: 10         5           0 Text Box: 0                      10                        20 km      0                        5                       10 km Text Box: Fig. 1 Survey flight path.  Distance in kms;  colour corresponds to gravity anomaly.  Bends in survey lines present no problem for the GT-1A. Text Box: Fig. 2  Free-air gravity profiles:  view from East;  vertical scale in mGal;  heavy line is mean of all 6 passes.  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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