Enabling GEOINT accuracy through geodetic, geophysical and photogrammetric sciences and content.
NGA offers foundational environmental data as well as scientific analysis of the environment and natural hazards, on both global and regional scales.
Global geohazard potentials and indications:
NGA provides worldwide gravity compensation data in support of U.S. military operations, mission planning, and safety of navigation. The 2 by 2 arc-minute spaced deflection of the vertical (DOV) is provided globally in terms of north-south and east-west components, with error estimates included. The unit of measurement is arc-seconds. This global coverage is repeated for a range of altitudes from 0 to 90,000 feet above mean sea level. This data is essential to the accuracy and effectiveness of high order inertial navigation systems (INS). It aids in the reduction of position and velocity error and improves orientation control when introduced into the INS solution. Deflection of the vertical (DOV) data is made available through the Defense Logistics Agency.
The Arctic Gravity Project (ArcGP) is an international effort dedicated to the compilation of a public-domain gravity grid of the Arctic gravity field north of 64° N. The focus of the gravity grid is the Arctic Ocean, Greenland, and the continental areas of North America and Russia north of 64° N. This international effort is being led by Rene Forsberg of the Technical University of Denmark and NGA of the USA, who were initially supported by a Special Working Group composed of members from ten different countries (USA, Canada, Sweden, Finland, England, Norway, Germany, Iceland, Russia, and France). The primary interest of the ArcGP is the compilation of state-of-the-art detailed free-air grids and was first made available to the general public in the year 2000 and updated in 2008. Historical information on the project, including previous grids and workshop/meeting minutes, are available on request. Please direct questions and/or comments to NGA Public Affairs Office (bottom right of page).
Arctic Gravity Project (2.4MB)
|Zip archive containing Arctic Gravity Project data and documentation.|