| - General - |
| Geofile: | NFLD/3075 |
| Companies: | Nalcor Energy; Energy Branch, Department of Natural Resources |
| Contractor: | Novatem Surveys Inc., Project C08072 |
| Survey Area: | Deer Lake, Nfld. |
| NTS Areas: | 12A/13; 12A/14; 12H/02; 12H/03; 12H/04; 12H/06; 12H/07; 12H/10 |
|
| - Survey Logistics - |
| Survey Date: | Oct. 2008 to May 2009 |
| Block: | Block 2 |
| Survey Extent: | 10,349 km total |
| Altitude: | Cessna 185 (C-FARU): 90 m |
| Line Spacing: | 200 m, Az: 130°; Ties: 2000 m, Az: 040° |
| Positioning: | Differential GPS provided by Novatel ProPack V3 GPS receiver on aircraft, corrected to CDGPS network; Optech laser altimeter, accurate to 1 cm; Prosilica GC 1020C wide angle digital camera, sampling at 10 Hz |
| Instrumentation: | Two Geometrics G822 split-beam cesium vapour magnetometers mounted at 11.0 m separation in aircraft wingtip pods (transverse gradient); GEM Systems GSM-19 Overhauser base station mag; fluxgate magnetometers measured for aircraft magnetic compensation; Novatem Inc. digital acquisition system |
| Data Recorded: | Total field mag; transverse mag gradient |
| Comments: | Open File maps were released Nov. 3, 2009. DGRF for year Jan. 15, 2009 removed from Total Field Mag data to yield residual; transverse and longitudinal gradients were determined from sensor differences; derived first and second vertical derivatives. Data processing is described in detail in the report. The other two areas covered by this survey are Indian Head (Open File 12B/0581, Survey DN09906) and Gros Morne (Open File NFLD/3076, Survey DN09908). |
|
| - Digital Data - |
| Confidentiality Date: | November 3, 2009 |
| Grid Cell Size: | 50 m |
| Projection of Data: | NAD83, UTM Zone 21 |
| Data Comments: | Final data were received from the contractor in late Nov. 2009; links are provided for download. The 1:50 000 scale PDF maps are also accessible via the Geological Survey Home Page. Database fields are described in Section 6 of report. The original grids submitted by the contractor were modified by trimming to the survey extents. The images (NAD27 & NAD83), linked below, were exported from Oasis Montaj at high resolution (10 m). |
| Links to Data: |
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| GIS Layers: |
| Colour, shaded relief image, Residual Magnetic Intensity (NAD27, 6.5 Mb zip'd) |
| Colour, shaded relief image, First Vert. Derivative of Mag (NAD27, 15.0 Mb zip'd) |
| Colour, shaded relief image, Second Vert. Derivative of Mag (NAD27, 24.0 Mb zip'd) |
| Colour, shaded relief image, Longitudinal Gradient of Mag (NAD27, 16.1 Mb zip'd) |
| Colour, shaded relief image, Transverse Gradient of Mag (NAD27, 16.2 Mb zip'd) |
| Colour, shaded relief image, Total Magnetic Intensity (NAD27, 6.3 Mb zip'd) |
| Colour, shaded relief image, Gradient-Enhanced Total Field (NAD27, 12.1 Mb zip'd) |
| Colour, shaded relief image, Gradient-Enhanced Vert. Grad. (NAD27, 22.7 Mb zip'd) |
| Colour, shaded relief image, Digital Elevation Model (NAD27, 15.6 Mb zip'd) |
| Colour, shaded relief image, Residual Magnetic Intensity (NAD83, 6.7 Mb zip'd) |
| Colour, shaded relief image, First Vert. Derivative of Mag (NAD83, 15.6 Mb zip'd) |
| Colour, shaded relief image, Second Vert. Derivative of Mag (NAD83, 25.3 Mb zip'd) |
| Colour, shaded relief image, Longitudinal Gradient of Mag (NAD83, 17.0 Mb zip'd) |
| Colour, shaded relief image, Transverse Gradient of Mag (NAD83, 17.6 Mb zip'd) |
| Colour, shaded relief image, Total Magnetic Intensity (NAD83, 6.5 Mb zip'd) |
| Colour, shaded relief image, Gradient-Enhanced Total Field (NAD83, 12.6 Mb zip'd) |
| Colour, shaded relief image, Gradient-Enhanced Vert. Grad. (NAD83, 23.9 Mb zip'd) |
| Colour, shaded relief image, Digital Elevation Model (NAD83, 16.1 Mb zip'd) |
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