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Lac la Martre Aeromagnetic Survey (Project Leader: Beth Fischer)

The Northwest Territories Geoscience Office (NTGO) commissioned an airborne magnetic survey over an area approximately 150 by 140 km including Lac la Martre in its southeast quadrant (see location map). Public aeromagnetic data were not previously available for most of this area; and those data available were of low resolution and accuracy.

In February and March 2006, approximately 56,000 line kilometres of horizontal gradiometer aeromagnetic data were collected for NTGO by Goldak Airborne Surveys. The survey was flown by two aircraft on east trending lines spaced 400 m apart, with north trending control lines at 2.5 km intervals. A nominal survey height of 150 m was maintained during flight by use of real time GPS and radar altimeter.


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Each aircraft was equipped with three cesium vapour magnetometers located in wingtip pods and a tail boom. Aircraft attitude data were captured by three GPS receivers on the body of the aircraft. Measured lateral and longitudinal magnetic gradients were corrected for aircraft attitude by removing the measured rotations before leveling.

This publication includes:

a digital database containing positional data, radar topography, leveled total magnetic field, and leveled
    lateral and longitudinal magnetic gradients;
grids and raster images in geotiff format of gradient enhanced total magnetic field, its first vertical
   derivative, radar topography, and the gradients;
the contractor's report; and
PDF maps, also available on paper, of total field and first vertical derivative, each in four sheets at
   1:100,000 scale.

The data from the survey is available as NWT Open File 2006-04, "Aeromagnetic Survey, Lac la Martre Area, Northwest Territories, parts of 85N, 85M, 86C, 86D", (here).