Folder
ROOT
_ScienceBase Catalog
__USGS Data Release Products
___Airborne Geophysical Surveys over the 2011 Mineral, Virginia, Earthquake Area
____Magnetic data
The grid provided here, "Levmag_UTM18N_50m.gxf", contains the magnetic anomaly after diurnal correction, IGRF removal, and leveling. Grids are in the ASCII grid exchange format (.gxf). Header information provides the grid dimensions, separation, coordinates and map projection, and z-value range information. The grid values follow. The projected coordinate system used for all grids is UTM Zone 18N: Datum: NAD83 Base Latitude: 0.00 degrees Central Meridian: -75.00 degrees False Easting: 500,000 meters False Northing: 0 meters Scale factor at natural origin: 0.9996 Detailed information regarding data collection and processing can be found in the technical report. These data should be cited as follows: Shah, A.,...
Line data are presented as comma separated values (csv) with the following definitions: LINE Flight line number DIR Flight line direction, degrees clockwise from North DATE Year / Julian day TIME Time (UTM, 24-hour) hh:mm:ss LONG Longitude, WGS84 (degrees) LAT Latitude WGS84 (degrees) x_UTM18N Easting, UTM Zone 18N (meters) y_UTM18N Northing, UTM Zone 18N (meters) RALT Radar altimeter height (meters) BALT Barometric altimeter height (meters) LALT Laser altimeter height (meters) GPSZ GPS elevation above GRS-80 ellipsoid RAWMAG Raw, compensated total magnetic intensity (nT) DMAG Diurnally corrected total magnetic intensity (nT)...
Images provided here include: MagAnom_UTM18N_NAD83 (GeoTiff, KMZ): Magnetic anomaly corrected for diurnal variations, IGRF removed, and leveled MagAnomContour50nT_UTM18N_NAD83 (GeoTiff, KMZ): Magnetic anomaly corrected for diurnal variations, IGRF removed, and leveled, 50 nT contours. MagAnomShaded_UTM18N_NAD83 (GeoTiff, KMZ): Shaded relief image of magnetic anomaly corrected for diurnal variations, IGRF removed, and leveled. Illumination is from the west. MagAnom_Colorbar.png provides a colorbar key for these magnetic anomaly images. Images may be geo-registered using embedded projection information in both the tiff and kmz files. Each image is projected using UTM Zone 18N: Datum: NAD83 Base Latitude: 0.00...
