U. S. Geological Survey Open-File Report 2004-1229B FINAL MAGNETOMETER DATA - blines.asc This archive contains DIGITAL DATA ARCHIVE for client review of an airborne geophysical survey conducted by FUGRO AIRBORNE SURVEYS CORP. on behalf of the USGS from October 17 to 31, 2003, in Colorado (Blanca area). The line data is in ASCII format with no header. -------------------------------------------------------------------------------- The following table describes the contents of the XYZ archives. Channel Name Format Channel Descriptor ------------ ---------- ----------------------------------------------- Width, Dec 1 - LINE 5, 0 Flight Line ID 2 - DIR 3, 0 FLight line direction 3 - FLT 3, 0 Flight number 4 - X_84F 11, 2 FINAL UTM X- GRS80 (WGS84 – UTM Zone 13 N) (m) 5 - Y_84F 12, 2 FINAL UTM Y- GRS80 (WGS84 – UTM Zone 13 N) (m) 6 - X_27F 11, 2 FINAL UTM X- GRS80 (NAD27 – UTM Zone 13 N) (m) 7 - Y_27F 12, 2 FINAL UTM Y- GRS80 (NAD27 – UTM Zone 13 N) (m) 8 – LON_84F 14, 7 LONGITUDE GPS WGS84 (deg.d) 9 – LAT_84F 12, 7 LATITUDE GPS WGS84 (deg.d) 10 - FIDUCIAL 10, 1 FIDUCIAL COUNTER 11 - DATE 11, 1 FLight date (YYYY/MM/DD) 12 - UTC 10, 1 UTC TIME (SECONDS) 13 – RALT_ML 10, 1 HELICOPTER RADAR ALTIMETER (m) 14 – Z_FIN 10, 1 GPS ALTITUDE (m) 15 – MAGR 10, 2 RAW TOTAL FIELD Magnetic Intensity despiked (nT) 16 – MAG_IGRF 10, 2 RESIDUAL Magnetic Intensity (diurnally corrected, lagged and IGRF removed) (nT) 17 – MAG2_GL 10, 2 FINAL RESIDUAL Magnetic Intensity (nT) 18 – DEMZ_FIN 10, 1 FINAL DIGITAL ELEVATION MODEL (Z_FIN-RALT_ML) (m) 19 – DIURNAL 10, 2 BASE MAG DATA -------------------------------------------------------------------------------- The coordinate system for all grids and XYZ files is projected as follows ----------------- Projection WGS84 ------------------------------------------------------ Datum WGS84 Spheroid GRS80 Projection UTM Zone 13 North Central meridian 105 West False easting 500000 False northing 0 Scale factor 0.9996 Northern parallel N/A Base parallel N/A WGS84 to local conversion method Molodensky Delta X shift 0 Delta Y shift 0 Delta Z shift 0 ----------------- Projection NAD27 ----------------------------------------------------- Datum NAD27 Spheroid GRS80 Projection UTM Zone 13 North Central meridian 105 West False easting 500000 False northing 0 Scale factor 0.9996 Northern parallel N/A Base parallel N/A WGS84 to local conversion method Molodensky Delta X shift 8 Delta Y shift -159 Delta Z shift -175 --------------------------------------------------------------------------------