Survey Name: An Airborne Gravimetric Survey over the QUEST West area of British Columbia Client Name: Geoscience British Columbia Society Datums: 1) NAD-83 UTM Zone 10N, 2) NAD-83 UTM Zone 09N, 3) NAD-83 BC ALBERS DLV0454 ---------------------------------------------------------------------------------------------------------- Geosoft GRIDS ============== Grid cell size = 500m Name Units Description -------------- ------ ---------------------------------------------- GRVFA3KM10N.grd mGal Free air gravity, 3km half-wavelength filter, NAD-83 UTM 10N GRVBG3KM10N.grd mGal Bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 UTM 10N FVDBG3KM10N.grd Eötvös FVD of bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 UTM 10N ISOBG3KM10N.grd mGal Isostatically corrected Bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 UTM 10N GRVFA3KM09N.grd mGal Free air gravity, 3km half-wavelength filte, NAD-83 UTM 09N GRVBG3KM09N.grd mGal Bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 UTM 09N FVDBG3KM09N.grd Eötvös FVD of bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 UTM 09N ISOBG3KM09N.grd mGal Isostatically corrected Bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 UTM 09N GRVFA3KMALB.grd mGal Free air gravity, 3km half-wavelength filter, NAD-83 BC ALBERS GRVBG3KMALB.grd mGal Bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 BC ALBERS FVDBG3KMALB.grd Eötvös FVD of bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 BC ALBERS ISOBG3KMALB.grd mGal Isostatically corrected Bouguer gravity, 3km half-wavelength filter, 2.67 g/cc, NAD-83 BC ALBERS ---------------------------------------------------------------------------------------------------------- GEOSOFT FORMAT ASCII LINE DATA ( Grav.XYZ ) ============================== COL NAME FORMAT UNIT DESCRIPTION ---------------------------------------------------------------------------------------------------------- 1 SECOND F10.2 second Fiducial Time 2 YEAR A6 - Year 3 DAY A5 - Day of year 4 FLT A4 - Flight number 5 LINE A8 - Line number 6 LATNAD83 F15.7 degrees Latitude NAD-83 7 LONGNAD83 F15.7 degrees Longitude NAD-83 8 UTMXN10N F15.2 m NAD-83 UTM 10N X 9 UTMYN10N F15.2 m NAD-83 UTM 10N Y 10 UTMXN09N F15.2 m NAD-83 UTM 09N X 11 UTMYN09N F15.2 m NAD-83 UTM 09N Y 12 BCALBERSX F15.2 m NAD-83 BC ALBERS X 13 BCALBERSY F15.2 m NAD-83 BC ALBERS Y 14 GPSZNAD83 F10.2 m Height above NAD-83 ellipsoid 15 MSLZ F10.2 m Height above mean sea level 16 LALT F10.1 m Laser altimeter 17 FZ F12.2 mGal Gravimeter vertical acceleration 18 AZ F12.2 mGal GPS vertical acceleration 19 GRVRAW F12.2 mGal Raw gravity (FZ - AZ), unfiltered 20 GRVLAT F12.2 mGal Latitude corrected gravity, unfiltered 21 GRVEOT F12.2 mGal Eötvös corrected gravity, unfiltered 22 GRVFRA F12.2 mGal Free air gravity, unfiltered 23 GRVFRA100 F10.2 mGal Free air gravity, 50s half-wavelength line filter 24 GRVFRAL100 F10.2 mGal Free air gravity, intersection adjusted, 50s half-wavelength line filter 25 BATH F10.2 m Terrain used for bouguer correction, using SRTM data with bathymetry for offshore areas 26 TERRAIN F10.2 m Terrain used for bouguer correction, using SRTM data only 27 SBGCOR F10.2 mGal Simple bouguer correction, 2.67g/cc density 28 GRVBGL100 F10.2 mGal Simple bouguer gravity, intersection adjusted, 50s half-wavelength line filter, 2.67g/cc density 29 GRVFRAL3KM F12.2 mGal Free air gravity, 50s half-wavelength line filter, 3km half-wavelength spatial filter 30 GRVBGL3KM F10.2 mGal Simple bouguer gravity, 50s half-wavelength line filter, 3km half-wavelength spatial filter, 2.67g/cc density 31 FVDBGL3KM F10.2 Eötvös First vertical derivative of simple bouguer gravity, 50s half-wavelength line filter, 3km half-wavelength spatial filter, 2.67g/cc density 32 ISOCORR F10.2 mGal Isostatic correction 33 ISOBGL100 F10.2 mGal Isostatic corrected Bouguer gravity, intersection adjusted, 50s half-wavelength line filter, 2.67g/cc density 34 ISOBGL3KM F10.2 mGal Isostatic corrected Bouguer gravity, 50s half-wavelength line filter, 3km half-wavelength spatial filter, 2.67g/cc density ---------------------------------------------------------------------------------------------------------- Notes: - 50s full-wavelength line filter = 100s full-wavelength mid-point, = 0% pass at 75s, 100% pass at 150s - 3km half-wavelength spatial filter = 6km full-wavelength mid point, = 0% pass at 4.5km, 100% pass at 9.0km - 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 irregularly 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.) ---------------------------------------------------------------------------------------------------------- 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