Applications
B-ii ENVI-MAG Manual
Survey procedures and a sample survey .................... B3-1
Introduction ...................................................................... B3-1
Survey do’s and don’ts.................................................... B3-1
Laying out the grid .......................................................... B3-1
Multiple grids............................................................ B3-4
Diurnal corrections vs. Survey pattern.............................. B3-4
Base-station corrections ........................................... B3-4
Tie-point Line and Loop mode corrections .................... B3-5
Search mode .................................................................. B3-7
Note taking .................................................................... B3-7
Surveying in the WALKMAG mode ..................................... B3-7
Sensor mounting and orientation ................................ B3-8
Sensor orientation .................................................... B3-8
Rough terrain ........................................................... B3-9
Station lag and Herring-boning ................................... B3-9
Surveying in the Stop-and-Go mode ................................... B3-10
Magnetic cleanliness ..................................................... B3-11
Monitoring your data ..................................................... B3-11
Post-survey procedures................................................ B3-11
Clean-up site if required................................................. B3-11
Data correction ............................................................ B3-11
Data transfer ............................................................... B3-12
Processing data ............................................................ B3-12
Field example .................................................................. B3-12
Columbia test site—Waterloo, Ontario ............................ B3-12
Grid layout.............................................................. B3-13
Bibliography ................................................................... B3-17
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