Oregon Aeromagnetic Anomaly Maps - Higher Resolution

These individual aeromagnetic residual anomaly grids/maps were generated using the most representative grid interval for the flight-line spacing of the surveys and maintain the original flight altitude of the individual surveys. They were then regridded to the 500-m (1,640-ft) interval and continued to the 305-m (1,000-ft) above ground flight altitude used in the State compilation.

Select an aeromagnetic map from the list below. Listing is by resolution from finer to coarser. All maps are displayed with an illumination from the northeast. The images were generated with a resolution to fit the screen and not with regard to original grid interval. Grids for all maps are in Geosoft Oasis montaj binary format (downloadable free software for conversions to other grid formats at www.geosoft.com) and available in the data directory. A 'README.txt' file located there further defines the format.

For a full description of survey specifications see "Oregon Magnetic Data Compilation" page.

Portland (1148) survey gridded at 100 m.

Columbia River (4265) survey gridded at 100 m.

Scott Mills (4169) survey gridded at 125 m.

Longview North (4174) survey gridded at 125 m.

Hillsboro Northwest (4178) survey gridded at 125 m.

Eugene (4186) survey gridded at 125 m.

Yamhill-Tillamook (4226) survey gridded at 125 m.

Pueblo Mountains (4126) survey gridded at 200 m.

Roseburg (4176) survey gridded at 200 m.

Offshore Eugene (4187) survey gridded at 250 m.

Longview Southwest (4175) survey gridded at 250 m.

Version 1.0

Posted August 2008

• Oregon Magnetic Map

• Map Info

• Processing Info

• Survey Info

• Detailed Aeromag Maps

• Bouguer Gravity Map

• Isostatic Gravity Map

• Data Directory
Contains: gridded data. Refer to the Readme file for more information.