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Gravity Data

The NCEI gravity database includes land and marine gravity surveys, grids, models, and geoids. Data parameters include latitude, longitude, Bouguer Gravity Anomaly (land), Free-air Anomaly (ocean), and observed gravity and elevation. Each dataset contains documentation, including the source contributor.

Approximately 70 percent of the data are observed values from regional station data collections (separated primarily by contributors) and absolute gravity measurements. The rest of the collection is made up of grids and other derived summary datasets. 

A standard format description for the land gravity data preserves fields unique to a specific data collection. Marine gravity data are stored in the MGD77 format. Standard terminology, minimum/maximum values, and histogram distributions are available for each parameter. 

Gravity Data File Extensions

  • .bin = binary data
  • .ast = ASCII data
  • .fmt = ASCII format description
  • .hdr = ASCII header/field description
  • .asc = ASCII other information

Data

Gravity Data Table
Name Extent Summary Image/
Plot		 Data
Africa: Southern Area International View View Access
Alaska Data Density Grid 2' x 4' Geoid View View Access
Alaska East-West Deflections (DEFLEC96) 2' x 4' Geoid View View Access
Alaska Geoid Heights (GEOID96) 2' x 4' Geoid View View Access
Alaska Interior Bouguer Gravity Anomaly Grid (10 km max interpolation) U.S. View   Access
Alaska Interior Bouguer Gravity Anomaly Grid (filled grid) U.S. View   Access
Alaska National Petroleum Reserve U.S. View View Access
Alaska North-South Deflections (DEFLEC96) Geoid View View Access
Alaska Terrain Corrected Free Air Anomalies Geoid View View Access
Alaska: ANWR and Alaska Peninsula U.S. View View Access
Alaska: Gravity Station Data U.S. View View Access
Alaska: Isostatic 25 km thickness U.S. View View Access
Alaska: Isostatic 30 km thickness U.S. View View Access
Alaska: Southwestern Area (Altimetric) U.S. View View Access
Alaska: Southwestern Area (Topographic) U.S. View View Access
Antarctic: Defense Mapping Agency (DMA) Gravity Station Data International View View Access
Bolivia Bouguer Anomaly Grid International View View Access
Bolivia Gravity Station Data International View View Access
California and Southern Nevada U.S. View View Access
California: Cadiz Gravity Station Data U.S. View View Access
Canada Gravity Geoid International View View Access
Colombia Gravity Station Data International View View Access
Earth Geopotential Model (EGM) 1996 Geoid View   Access
Egypt International View View Access
Former Soviet Union (FSU) Gravity Data International View   Access
GEOSAT Southern Ocean Gravity Anomalies (Altimetric) International View   Access
GEOSAT44: High-Accuracy, High-Resolution Gravity Profiles (from the first 2 years of the GEOSAT Exact Repeat Mission) (ascending) Global View   Access
GEOSAT44: High-Accuracy, High-Resolution Gravity Profiles (from the first 2 years of the GEOSAT Exact Repeat Mission) (descending) Global View   Access
Global Absolute Gravity Station Data Absolute Measurements View View Access
Hawaiian Islands East-West Deflections (DEFLEC96) Geoid View View Access
Hawaiian Islands Geoid Heights (GEOID96) Geoid View View Access
Hawaiian Islands Gravity Data Density Grid (1996) Geoid View View Access
Hawaiian Islands North-South Deflections (DEFLEC96) Geoid View View Access
Hawaiian Islands Terrain Corrected Free Air Anomalies U.S. View View Access
Haxby Worldwide Gravity Anomaly Grid Global View View Access
High Density Geosat/GM Altimeter Data Global View View Access
Idaho Batholith Study Area Bouguer Anomaly Grid U.S. View View Access
Idaho Batholith Study Area Gravity Station Data U.S. View View Access
Idaho Batholith Study Area Isostatic 30km thickness U.S. View View Access
Idaho Batholith Study Area Terrace-Density Grid U.S. View View Access
Idaho Bouguer Gravity Grid U.S. View View Access
Idaho Gravity Station Data U.S. View View Access
Indiana (1989) U.S. View View Access
Indiana (1993) U.S. View View Access
Japan Gravity Station Data International View View Access
Maine Bouguer Gravity Grid U.S. View View Access
Maine Offshore Gravity Station Data U.S. View View Access
Maine Onshore Complete Bouguer, Free Air, and Gravity Station Data U.S. View View Access
Maryland / Virgina Gravity Station Data U.S. View View Access
Mexico East-West Deflections (DMEX97) Geoid View View Access
Mexico Geoid Heights (MEXICO97) Geoid View View Access
Mexico Gravity Data Density Grid 2' x 2' (1997) Geoid View View Access
Mexico North-South Deflections (DMEX97) Geoid View View Access
Mexico Terrain Corrected Free Air Anomalies (1997) Geoid View View Access
Minnesota Bouguer Anomaly Grid U.S. View View Access
Minnesota Gravity Station Data U.S. View View Access
Nevada Bouguer Gravity Grid U.S. View View Access
Nevada Gravity Station Data U.S. View View Access
Nevada Isostatic Gravity Grid U.S. View View Access
Nevada Isostatic Residual Gravity Over Basement U.S. View View Access
Nevada Thickness of Cenozoic Deposits U.S. View View Access
New Mexico Gravity Station Data U.S. View View Access
North America: 2.5' Bouguer and Free Air Gravity Grid U.S. View View Access
North America: Decade of North American Geology (DNAG) International View View Access
Ohio Bouguer Gravity Grid U.S. View View Access
Ohio Gravity Station Data (1992) U.S. View View Access
Ohio Gravity Station Data (1993) U.S. View View Access
Oklahoma Gravity Station Data U.S. View View Access
Oregon Gravity Station Data U.S. View View Access
Portugal Gravity Station Data International View View Access
Puerto Rico and the Virgin Islands East-West Deflections (DEFLEC96) Geoid View View Access
Puerto Rico and the Virgin Islands Free Air Anomalies (1996) Geoid View View Access
Puerto Rico and the Virgin Islands Geoid Heights (GEOID96) Geoid View View Access
Puerto Rico and the Virgin Islands Gravity Data Density Grid (1996) Geoid View View Access
Puerto Rico and the Virgin Islands North-South Deflections (DEFLEC96) Geoid View View Access
RAPP92 Global Mean Free-Air Gravity Anomaly Grid Global View   Access
RAPP92 Global Sea Surface Height Grid Geoid View   Access
Russia (former U.S.S.R) Magnetic Anomaly Data International     Access
South America Gravity Station Data (1993) International View View Access
South America: Andes Gravity Station Data (1997) International View View Access
Spain Gravity Station Data International View View Access
TerrainBase Global Terrain Model Global View   Access
Terrestrial Mean Free-Air Anomalies (1-deg x 1-deg) Global View   Access
Terrestrial Mean Free-Air Anomalies (30' x 30') Global View   Access
U.S. 2.5' Isostatic Gravity Grid 30km thickness U.S. View View Access
U.S. Basin and Range Province USGS Grids U.S. View   Access
U.S. East-West Deflections (DEFLEC96) Geoid View View Access
U.S. Geoid Heights (GEOID96) Geoid View View Access
U.S. Geoid Heights, Scientific Model (G96SSS) Geoid View View Access
U.S. Gravity Data Density Grid (1996) Geoid View View Access
U.S. Isostatic Regional Gravity Grid 30km thickness U.S. View View Access
U.S. Isostatic Residual Gravity Grid 30km thickness U.S. View View Access
U.S. NGS Gravity Network Data (1990) U.S. View View Access
U.S. NGS Gravity Station Data (1999) U.S. View View Access
U.S. North-South Deflections (DEFLEC96) Geoid View View Access
U.S. SEG Bouguer Gravity Anomaly Grid U.S. View View Access
U.S. Terrain Corrected Free Air Anomalies (1996) Geoid View View Access
U.S. Topographic Grid U.S. View View Access
Utah Bouguer Gravity Grid U.S. View View Access
Utah Gravity Station Data U.S. View View Access
Utah: Vernal Gravity Station Data U.S. View View Access
Wisconsin: Ashland Area Gravity Station Data U.S. View View Access
Wisconsin: Marshfield Area Gravity Station Data U.S. View View Access
Wisconsin: Prentice Area Gravity Station Data U.S. View View Access
Wisconsin: Rhinelader Area Gravity Station Data U.S. View View Access
Wisconsin: Sawyers Area Gravity Station Data U.S. View View Access
Wisconsin: Wisconsin Rapids Area Gravity Station Data U.S. View View Access
Worldwide: DMA Reference Base Station Network Data Global View View Access