Gravity on the move

Case History 7

Fixed-wing grid survey

Survey Description

Date                                        December 2 to 12, 2002

Location                                   Kalgoorlie, WA

Survey vehicle                          Cresco single-engine turbo-prop

Survey lines                             50 N-S lines; 40 E-W lines

Line spacing                             250m for both sets of lines

Length of lines                          N-S lines: 27 kms              E-W lines: 20 kms

Survey altitude                          N-S lines: 740.1 +/- 2.5 m (approx. 300 m AGL)

                                                           E-W lines: 933.2 +/- 1.2 m (approx. 500 m AGL)

Ground speed                           N-S lines: 48.9 +/- 4.9 m/sec

                                               E-W lines: 50.8 +/- 4.2 m/sec

Wind speed                              Strong, typically 20 knots, gusting to 40 knots

Results

Saturations/line N-S                  Fine channel: 132.6          Coarse channel:   4.1

Saturations/line E-W                 Fine channel:   16.2           Coarse channel:   0.7

Processing                              First order level (offset) and drift removed

Filter                                       80 sec & 110 sec

Spatial resolution                     80 sec filter: 1.99 kms

                                              110 sec filter: 2.74 kms

Airborne vs. ground                   0.43 mGals 110 sec filter (0.44 mGals 80 sec)

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