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Case History 3

Fixed-wing grid survey 

Survey Description

Date                                               August 13 &14, 2002

Location                                          Ladoga Lake, Russia

Survey vehicle                                  Antonov 30

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

            Survey altitude                                 887 +/- 5.0 m ASL

Ground speed                                  96.1+/- 1.4 m/sec

Wind speed                                     Aug 13:  5.6 m/sec       Aug 14:  13.9 m/sec

 

Results

Processing                                      First order level (offset) and drift removed

Filter                                               100 sec

Spatial resolution                             4.8 km

RMS error from mean                       0.45 mGals

Text Box: Fig. 2  Free-air gravity surface: 3D view from NW;  RMS error from mean 0.45 mGals.    Text Box: Fig. 1  Survey flight path (N is up).  Distance in kms;  colour corresponds to free-air gravity values.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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