Post-survey procedures
ENVI-MAG Manual B3-11
Example
Magnetic cleanliness
Certain precautions must be observed before taking readings with a
magnetometer. You, as an operator, should be devoid of any metallic objects on
your person, such as belt buckles, rock picks, steel-toe boots and compasses.
These metallic objects will interfere with the normal reading taken by the
magnetometer and produce spurious data.
Monitoring your data
Once data have been collected either on a single line or the entire grid, you can
review the data on the console’s display screen. This will allow you to visually
locate anomalies, as well as, determine the intensity of the anomalies. This is
done using the ENVI-MAG’s graphic display capabilities of the magnetometer
data.
You can also visually monitor the magnetic activity at your base station with this
feature. These features are well explained in the operations manual section and
you should refer to this section starting on page A3-30 for further details.
Post-survey procedures
Clean-up site if required
Once the data is collected, it is a good procedure to remove all stakes and
markings left behind, therefore avoiding further damaging the environment.
Data correction
The survey data collected should be corrected at the end of the survey day or the
end of the grid. The procedures to perform data correction are explained at
length in the instrument operation section starting on page A5-15. However, there
are some points that are useful to mention at this stage.
Data correction is done automatically while the survey is carried out in the tie-
line mode. However, when using a base station the survey data is corrected with
the data from the base station.
Warning: Once the data has been corrected with the base station, the raw
uncorrected survey data can no longer be retrieved.
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