Aeromagnetic and related data were digitized from 1976 magnetic field and survey route location maps of western Afghanistan. The magnetic field data were digitized along contour lines from 33 maps in a series entitled "Map of Magnetic Field of Afghanistan (Western Area) ΔTa Isolines," compiled by V. A. Cnjagev and A. F. Bukhmastov. The survey route location data were digitized along flight-lines located on 33 maps in a series entitled "Survey Routes Location and Contours of Flight Equal Altitudes, Western Area of Afghanistan," compiled by Z. A. Alpatova, V. G. Kurnosov, and F. A. Grebneva.

DATA PRODUCTS

All grids are presented in Geosoft binary grid format, with two files describing each of the grids (suffixes .grd and .gi). All databases are presented in Geosoft database format, with two files describing each of the databases (suffixes .gdb and .gd~). Either of these formats can be converted to other formats using the free conversion software located at http://www.geosoft.com/.

1. 34-66_mag.gdb - Database of digitized aeromagnetic data.
2. 34-66_mag.grd - Grid of digitized aeromagnetic data at 400 m grid spacing.
3. 34-66_mag.XYZ - ASCII XYZ file of digitized aeromagnetic data.
4. 34-66_mag.tif - ArcView GeoTIFF of digitized aeromagnetic data.
5. 34-66_mag_bnd.tif - ArcView GeoTIFF of digitized aeromagnetic data with Afghanistan boundary.
6. 3-33_lines_ln.shp - ArcView shapefile of flight-line locations.
7. readme_RUS_datafiles.pdf - Description of the data products.

PROJECTION SPECIFICATIONS

All databases, maps, grids, and xyz files in this report use the following projection specifications:

• Projection = Transverse Mercator
• Central meridian = 66 degrees E
• Base latitude = 34 degrees N
• Scale factor = 0.9996
• Semi-major ellipsoid axis = 6378137 m
• Eccentricity = 0.08181919084
• Horizontal datum = WGS 84
• Ellipsoid = WGS 84

This web site makes available to users the data products mentioned above for these surveys. To view this directory, click on the link below. To view the README file ("readme_RUS_datafiles.pdf") describing the aeromagnetic data product files, click on the README line following.

Data Products Directory

readme_RUS_datafiles PDF file describing data in above directory

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For more information about this report contact: Pat Hill

Version 1.0

Posted October 2006

• Data Products Directory
Refer to the readme_RUS_datafiles.pdf file describing data in above directory.

• West Afghanistan Metadata TXT file

• Crustal Team