| - General - |
| Geofile: | 02D/0956 |
| Companies: | Geological Survey of Newfoundland and Labrador |
| Contractor: | Novatem Inc., Job C20133 |
| Survey Area: | Great Gull Lake, central Nfld. |
| NTS Areas: | 02D/03; 02D/05; 02D/06; 02D/11; 02D/12 |
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| - Survey Logistics - |
| Survey Date: | Jan. 13 to Mar. 8, 2021 |
| Block: | Great Gull Lake |
| Survey Extent: | 11275.0 line km; 1691.3 km Tie (400+65); 12966.3 km Total |
| Altitude: | Piper Navajo PA-31 (C-FNWG): 90 m drape surface |
| Line Spacing: | 150 m, Az: 135°; Ties: 1000 m, Az: 045° |
| Positioning: | Novatel Propak-V3 DGPS system, to Novatel Propak DL-V3 GPS receiver at base; Novatem draping navigation system; Waypoint GrafNav post-survey flight recovery; Optech ADM laser altimeter; Free Flight Systems TRA 4000 radar altimeter; Microstrain Inertial Measurement Unit (IMU); barometric altimeter - Honeywell temperature and relative humidity sensors; Rugged Video Commander flight path camera |
| Instrumentation: | Three Geometrics G-822A split-beam cesium vapour magnetometers mounted in aircraft wingtip pods (transverse gradient) and tail boom (longitudinal gradient); Billingsley 3-axis flux-gate sensor magnetic field compensation system; two Radiation Solutions Inc. RSX-5 gamma-ray spectrometers with 4 downward (33.44 l) and 1 upward (8.36 l) crystal detector packs, providing 1024 channel output; GEM Systems GSM-19 base station mag; Novatem high-resolution digital data acquisition and compensation system |
| Data Recorded: | Total field mag; horizontal gradient mag; 512 channel gamma-ray spectrometry |
| Comments: | Release date has been set for 10:00 am (NT), Tuesday, May 16, 2023. |
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| - Digital Data - |
| Date Submitted: | May 10, 2021 |
| Grid Cell Size: | 35 m |
| Projection of Data: | WGS84, UTM Zone 21 |
| Data Comments: | Please notify if errors or broken links are encountered. Please Note: Many of the GeoTIFF versions of Map files, linked below, were generated without elevation contours. These files will be replaced at next opportunity. (May 16, 2023) |
| Links to Data: |
| Profile archive - Mag, Geosoft database format (520 Mb zip'd) |
| Profile archive - Radiometric & DEM, Geosoft database format (150 Mb zip'd) |
| Interpolated grids, Mag, Geosoft format, WGS84 (48 Mb zip'd) |
| Mag Horizontal Derivative grids, Geosoft format, WGS84 (72.6 Mb zip'd) |
| Mag derivative (AS,TD,TDHD) & DEM grids, Geosoft format, WGS84 (25 Mb zip'd) |
| Interpolated grids, Radiometric, Geosoft format, WGS84 (34.2 Mb zip'd) |
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| GIS Layers: |
| Survey flight paths, Shapefile format (2 m resolution, NAD83, UTM Zone 21N, zip'd) |
| Colour, shaded relief Magnetic images, NAD83 (10 m resolution, 180 Mb zip'd) |
| Colour, shaded relief Mag Hor. Derivative images, NAD83 (10 m resolution, 240 Mb zip'd) |
| Colour, shaded relief Mag Derivative & DEM images, NAD83 (10 m resolution, 130 Mb zip'd) |
| Colour, shaded relief Radiometric images, NAD83 (10 m resolution, 300 Mb zip'd) |
| Map 2023-02 as Geotiff, Residual Mag Intensity (RMI) (8 m resolution, 53 Mb zip'd) |
| Map 2023-03 as Geotiff, Mag, First Vert. Deriv. (1VD) (8 m resolution, 70 Mb zip'd) |
| Map 2023-04 as Geotiff, Mag, Analytic Signal (8 m resolution, 64 Mb zip'd) |
| Map 2023-05 as Geotiff, Mag, Tilt Derivative (8 m resolution, 74 Mb zip'd) |
| Map 2023-06 as Geotiff, Percent Potassium (8 m resolution, 82 Mb zip'd) |
| Map 2023-07 as Geotiff, equivalent Thorium, ppm (8 m resolution, 85 Mb zip'd) |
| Map 2023-08 as Geotiff, equivalent Uranium, ppm (8 m resolution, 86 Mb zip'd) |
| Map 2023-09 as Geotiff, Thorium/Potassium Ratio (8 m resolution, 78 Mb zip'd) |
| Map 2023-10 as Geotiff, Uranium/Potassium Ratio (8 m resolution, 73 Mb zip'd) |
| Map 2023-11 as Geotiff, Uranium/Thorium Ratio (8 m resolution, 74 Mb zip'd) |
| Map 2023-12 as Geotiff, Natural Dose Rate (8 m resolution, 83 Mb zip'd) |
| Map 2023-13 as Geotiff, Ternary Radioelement Image (8 m resolution, 53 Mb zip'd) |
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