I. CONTENTS FILES IN DIRECTORY: AIRBORNE ELECTROMAGNETIC AND MAGNETIC DATA: YukonAEM_Data.XYZ YukonAEM_Data.gbd COORDINATE SYSTEM: HORIZONTAL: Universal Transverse Mercator projection Zone 6 North North American Datum of 1983 (NAD83) VERTICAL: Earth Gravitational Model of 1996 (EGM96) Altitudes are derived from processed GPS data collected during the AEM survey II. DATABASE FORMAT AIRBORNE ELECTROMAGNETIC AND MAGNETIC DATA: CHANNEL UNITS DESCRIPTION LINE Line number FLIGHT flight number FID fiducial increment LONG degrees longitude NAD 83 LAT degrees latitude NAD83 X m easting NAD83 UTM zone 6N Y m northing NAD83 UTM zone 6N YEAR YYYYDDD day of year TIME HHMMSS.SS time of day ALTR m radar altitude of sensor (helicopter- 27.74m cable length) ALTB m barometric altitude of helicopter ALTG m GPS measured orthometric sensor height ALTL m EM sensor altitude from laser altimeter DTM m orthographic corrected terrain elevation (ALTG-ALTL) CPI400_RAW ppm coplanar inphase 378 Hz - raw unprocessed CPQ400_RAW ppm coplanar quadrature 378 Hz - raw unprocessed CPI180_RAW ppm coplanar inphase 1843 Hz - raw unprocessed CPQ1800_RAW ppm coplanar quadrature 1843 Hz - raw unprocessed CXI3300_RAW ppm coaxial inphase 3260 Hz - raw unprocessed CXQ3300_RAW ppm coaxial quadrature 3260 Hz - raw unprocessed CPI8200_RAW ppm coplanar inphase 8180 Hz - raw unprocessed CPQ8200_RAW ppm coplanar quadrature 8180 Hz - raw unprocessed CPI40K_RAW ppm coplanar inphase 40650 Hz - raw unprocessed CPQ40K_RAW ppm coplanar quadrature 40650 Hz - raw unprocessed CPI140K_RAW ppm coplanar inphase 128510 Hz - raw unprocessed CPQ140K_RAW ppm coplanar quadrature 128510 Hz - raw unprocessed CPI400_LAG ppm coplanar inphase 378 Hz - phase, gain, background and lag corrected CPQ400_LAG ppm coplanar quadrature 378 Hz - phase, gain, background and lag corrected CPI1800_LAG ppm coplanar inphase 1843 Hz - phase, gain, background and lag corrected CPQ1800_LAG ppm coplanar quadrature 1843 Hz - phase, gain, background and lag corrected CXI3300_LAG ppm coaxial inphase 3260 Hz - phase, gain, background and lag corrected CXQ3300_LAG ppm coaxial quadrature 3260 Hz - phase, gain, background and lag corrected CPI8200_LAG ppm coplanar inphase 8180 Hz - phase, gain, background and lag corrected CPQ8200_LAG ppm coplanar quadrature 8180 Hz - phase, gain, background and lag corrected CPI40K_LAG ppm coplanar inphase 40650 Hz - phase, gain, background and lag corrected CPQ40K_LAG ppm coplanar quadrature 40650 Hz - phase, gain, background and lag corrected CPI140K_LAG ppm coplanar inphase 128510 Hz - phase, gain, background and lag corrected CPQ140K_LAG ppm coplanar quadrature 128510 Hz - phase, gain, background and lag corrected CPI400_LLEV ppm coplanar inphase 378 Hz - smoothed and leveled CPQ400_LLEV ppm coplanar quadrature 378 Hz - smoothed and leveled CPI1800_LLEV ppm coplanar inphase 1843 Hz - smoothed and leveled CPQ1800_LLEV ppm coplanar quadrature 1843 Hz - smoothed and leveled CXI3300_LLEV ppm coaxial inphase 3260 Hz - smoothed and leveled CXQ3300_LLEV ppm coaxial quadrature 3260 Hz - smoothed and leveled CPI8200_LLEV ppm coplanar inphase 8180 Hz - smoothed and leveled CPQ8200_LLEV ppm coplanar quadrature 8180 Hz - smoothed and leveled CPI40K_LLEV ppm coplanar inphase 40650 Hz - smoothed and leveled CPQ40K_LLEV ppm coplanar quadrature 40650 Hz - smoothed and leveled CPI140K_LLEV ppm coplanar inphase 128510 Hz - smoothed and leveled CPQ140K_LLEV ppm coplanar quadrature 128510 Hz - smoothed and leveled APRHO400 ohm.m apparent resistivity - 378 Hz APRHO1800 ohm.m apparent resistivity - 1843 Hz APRHO8200 ohm.m apparent resistivity - 8180 kHz APRHO40K ohm.m apparent resistivity - 40650 Hz APRHO140K ohm.m apparent resistivity - 128510 Hz PSDEP400 m apparent depth - 378 Hz PSDEP1800 m apparent depth - 1843 Hz PSDEP8200 m apparent depth - 8180 Hz PSDEP40K m apparent depth - 40650 Hz PSDEP140K m apparent depth - 128510 Hz CENTDEP400 m centroid depth - 378 Hz CENTDEP1800 m centroid depth - 1843 Hz CENTDEP8200 m centroid depth - 8180 kHz CENTDEP40K m centroid depth - 40650 Hz CENTDEP140K m centroid depth - 128510 Hz DIFFRHO400 ohm.m differential resistivity - 378 Hz DIFFRHO1800 ohm.m differential resistivity - 1843 Hz DIFFRHO8200 ohm.m differential resistivity - 8180 kHz DIFFRHO40K ohm.m differential resistivity - 40650 Hz DIFFRHO140K ohm.m differential resistivity - 128510 Hz DIFFDEP400 m differential depth - 378 Hz DIFFDEP1800 m differential depth - 1843 Hz DIFFDEP8200 m differential depth - 8180 Hz DIFFDEP40K m differential depth - 40650 Hz DIFFDEP140K m differential depth - 128510 Hz SF spherics monitor HZ60 60 Hz powerline monitor MAGR nT Uncorrected total field magnetics DIURNAL nT Base magnetometer total field magnetics MAG nT Total field magnetics lagged and corrected for diurnal MAGLEV nT Leveled magnetic data MAGIGRF nT Leveled and IGRF removed magnetic data III. DISCLAIMERS Although these data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. 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