Survey Name:  Levé gravimétrique aéroporté dans la région de Matagami, Québec
Client Name:  Ministère des ressources naturelles et de la faune (MRNF) Québec

Final Data Delivery
March 27, 2008

Datum: NAD83 UTM Zone 17N                                            DLV0384

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Geosoft GRIDS
==============
Grid cell size = 250m

Name               Units             Description
-----             -------          --------------
GRVFA1800M.grd     mGal        Free air gravity, 1800m half-wavelength filter
GRVBG1800M.grd     mGal        Bouguer gravity, 1800m half-wavelength filter, 2.67 g/cc
FVDBG1800M.grd     mGal/km     FVD of bouguer gravity, 1800m half-wavelength filter, 2.67 g/cc

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GEOSOFT FORMAT ASCII LINE DATA  ( Grav.XYZ )
==============================

COL  NAME        FORMAT      UNIT       DESCRIPTION
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1   line           A10         -        line number
2   time           F10.2    second      time (seconds after midnight)
3   X              F15.2       m        UTMX East, NAD83 - UTM 17N
4   Y              F15.2       m        UTMY North, NAD83 - UTM 17N
5   lat            F15.7    degrees     latitude, NAD83
6   long           F15.7    degrees     longitude, NAD83
7   ralt           F10.2       m        radar altitude
8   lalt           F10.2       m        laser altitude
9   drape          F10.2       m        drape surface
10  gpsz_rrl       F10.2       m        GPS-Z elevation above GRS80 ellipsoid (in realtime)
11  gpsz_pp        F10.2       m        GPS-Z elevation above GRS80 ellipsoid (post processed)
12  gpsz_fin       F10.2       m        GPS-Z elevation above mean sea level (post processed)
13  rater          F10.2       m        digital elevation model from radar altimeter
14  later          F10.2       m        digital elevation model from laser altimeter
15  bter           F10.2       m        digital elevation model from SRTM (used for gravity correctons)
16  fx             F12.2     mGal       gravimeter x-accelerometer
17  fy             F12.2     mGal       gravimeter y-accelerometer
18  fz             F12.2     mGal       gravimeter z-accelerometer
19  az             F12.2     mGal       gps z acceleration
20  gvraw          F12.2     mGal       raw gravity (fz-az)
21  gvlat          F12.2     mGal       latitude corrected gravity, unfiltered
22  gveot          F12.2     mGal       eotvos corrected gravity, unfiltered
23  gvfa           F12.2     mGal       free air corrected gravity, unfiltered
24  gvfa100s       F10.2     mGal       free air corrected gravity, 100s full-wavelength line filter
25  gvfal100s      F10.2     mGal       free air corrected gravity, intersection adjusted, 100s full-wavelength line filter
26  sbcor          F10.2     mGal       simple bouguer correction, 2.67 g/cc
27  eccor          F10.2     mGal       earth curvature correction
28  tercor         F10.2     mGal       terrain correction
29  gvbgl100s      F10.2     mGal       bouguer corrected gravity, 2.67 g/cc intersection adjusted, 100s full-wavelength line filter
30  gvfal1800      F10.2     mGal       final free air corrected gravity, 1800m half-wavelength spatial filter
31  gvbgl1800      F10.2     mGal       final bouguer corrected gravity, 2.67 g/cc, 1800m half-wavelength spatial filter
32  date_gsc       A10         -        date ddmmyyyy (example : 31012008)
33  flt            A4          -        flight number

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Notes:

- Null values are represented by an "*"

- 100s full-wavelength line filter = 100s full-wavelength mid-point,
                                   = 0% pass at 75s, 100% pass at 150s

- 1800m half-wavelength spatial filter = 3600m full-wavelength mid point,
                                       = 0% pass at 2700m, 100% pass at 5400m

- Format of line numbers in line number channel is XXXX.YZ where:
     XXXX is the line number (3-digits for control lines and 4-digits for traverse lines)
     Y indicates the section number, used in the case where planned lines are broken into more
        than one part due to odd shaped survey boundaries or restricted zones inside a survey area
        that are not to be flown, etc. (0 is the first section, 1 is the second section and so on)
     Z indicates reflights, or partial lines being flown to complete a survey line (0 is first
        flown, 1 is first reflight, etc.)

- Test lines are numbered 80xx.yy where xx is the flight number, yy is the pass along
  the test line for that flight (.01 for the first pass, .02 for the second pass).
  Test lines do not contain spatially filtered data since they lie outside the survey
  grid boundary.


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Flown and compiled by:

Sander Geophysics Ltd.
260 Hunt Club Road
Ottawa ON  K1V 1C1
CANADA
Phone : +1 613 521 9626
Fax   : +1 613 521 0215
Email : info@sgl.com
Web   : www.sgl.com
