Wrangellia Geophysical Survey

The digital data below was produced from airborne geophysical surveys conducted in 2013 for the Talkeetna Mountains, Healy, and Mt. Hayes quadrangles in south-central Alaska. The area is in the Valdez Creek and Delta River mining districts. Aeromagnetic and electromagnetic (EM) data were acquired by helicopter for about 1310 sq miles, and additional data donated by Millrock Exploration Corporation, Anchorage, increased coverage by about 12 sq miles. Millrock also provided some infill flight lines for over a similar amount of sq miles. CGG acquired and processed all the airborne geophysical data. The data were all flown with the same systems and contract specifications. CGG's frequency-domain DIGHEM V system was used for the EM data. GPR 2014-1 includes (1) raw and processed linedata; (2) gridded, Google Earth, and Geotiff formats of the calculated linedata; (3) maps of the data and flight lines; (4) vector files of data contours and flight lines. A future publication will include the technical project report, interpretation map, and EM anomalies, as well as other files.

Available Data Metadata Overview
File Name Data File Format Download File Size
gpr2014-1_vectors-DXF-nad27-z6N Vector data Download 357.3 M
gpr2014-1_vectors-SHP-nad27-z6N Shapefile Download 325.2 M
gpr2014-1_maps-HPGL2-part1 Plot files Download 347.8 M
gpr2014-1_maps-HPGL2-part2 Plot files Download 303.7 M
gpr2014-1_linedata-GDB-part1 Line data GDB files Download 445.9 M
gpr2014-1_linedata-GDB-part2 Line data GDB files Download 363.1 M
gpr2014-1_grids-GRD-nad27-z6N Gridded data Geosoft format Download 185.9 M
gpr2014-1_grids-ERS-nad27-z6N Gridded data ER Mapper Download 115.9 M
gpr2014-1_geotiffs-and-kmzs Georeferenced raster files Download 327.0 M
gpr2014-1_maps-PDF-part1 Adobe PDF files Download 522.1 M
gpr2014-1_maps-PDF-part2 Adobe PDF files Download 524.7 M


Click to enlarge


  • GPR 2014-1. Wrangellia survey area: Airborne magnetic and electromagnetic data in line (point), grid, vector, and map formats, Talkeetna Mountains, Healy, and Mt. Hayes quadrangles, south-central Alaska.