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Mexico Gravity Data per 2 min Cell (97)
This 2' gravity density grid for Mexico, North-Central America, and the Western Caribbean Sea shows the distribution of about one million terrestrial and marine gravity measurements held in the NGS database as of March 1997. These gravity measurements have been augmented by data contributions from NGA (former National Imagery and Mapping Agency), and satellite altimeter-derived gravity anomalies computed by Sandwell and Smith (1997). This density grid shows the number of gravity data contained in a 2' x 2' cell. Please note that this coverage grid does not show the 15'x15' EGM96 gravity values used to fill the void areas south of 20 degrees North. Additional information is available at: http://www.ngs.noaa.gov/GEOID/MEXICO97 .We are particularly grateful to NGA (former National Imagery and Mapping Agency) for their assistance and their data contributions.
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Gravity Data for the State of New Mexico
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The gravity station data (21,242 records) were compiled by the University of Texas at El Paso. This data base was received in October 1984. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (no terrain correction applied). The observed gravity values are referenced to the International Gravity Standardization Net 1971 (IGSN 71). The gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the boundaries of the State of New Mexico.
Cadiz, California Gravity Data
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The gravity station data (32 records) were gathered by Mr. Seth I. Gutman for AridTech Inc., Denver, Colorado using a Worden Prospector gravity meter. This data base was received in June 1985. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (no terrain correction applied). The observed gravity values are referenced to the International Gravity Standardization Net 1971 (IGSN 71). The gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the area of central San Bernardino County, California.
Hawaiian Islands Gravity Data per 2 min Cell (96)
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This 2' gravity density grid for the Principal Hawaiian Islands displays the distribution of about 61,000 terrestrial and marine gravity data held in the National Geodetic Survey gravity data base in July 1996. These data were augmented by gravity data contributions from NGA (former National Imagery and Mapping Agency (former Defence Mapping Agency)) and by satellite altimeter-derived marine gravity anomalies computed by Sandwell and Smith (1996). The values show the number of gravity data contained in a given 2' cell. Additional information is available at http://www.ngs.noaa.gov/GEOID/geoid.html We are particularly grateful to NGA (former National Imagery and Mapping Agency) for their assistance and their data contributions.
2.5-min gravity grid of N. America
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The dgrav gridded data set was produced by NGDC by regridding the Decade of North American (DNAG) 6-km gravity grid of N. America. A grid cell dimension of 2.5 minutes of longitude and latitude was used in this regridding process. In order to facilitate the comparison of the various regridded data, a geodetic reference system was used as the most suitable common coordinate frame.
DNAG Gravity Data
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The Decade of North American Geology (DNAG) gravity grid values, spaced at 6 km, were used to produce the Gravity Anomaly Map of North America (1987; scale 1:5,000,000). Considerable caution should be exercised when using these gridded data in regions of sparse coverage (for example, deep oceanic areas). The spatial distribution of the original data from which the grid was generated is shown on sheet 5 of the published map. Note: There are no gridded data values for Mexico.
NGS Absolute Gravity Data
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The NGS Absolute Gravity data (78 stations) was received in July 1993. Principal gravity parameters include Gravity Value, Uncertainty, and Vertical Gradient. The data are randomly spaced worldwide.
Maine Offshore Free-air Anomaly Gravity
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The gravity station data (5,363 records) were compiled by the U. S. Geological Survey. This data base was received on February 23, 1993. Principal gravity parameters include observed gravity and Free-air anomalies. The observed gravity values are believed referenced to the International Gravity Standardization Net 1971 (IGSN 71). It is also believed the gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula.
The Canadian Gravity Geoid
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A detailed gravimetric geoid has been computed on a 10' by 10' grid for Canada by the University of New Brunswick. This data base was received in April 1989. Principal gravity parameters include latitude, east longitude, and total geoidial height above GRS'80 reference ellipsoid. The gravity data used for the spheroidal Stokes's integration consisted of point gravity anomalies for the innermost zone, of 5'x5' mean gravity anomalies for the inner zone, and 1x1 degree mean gravity anomalies for the outer zone. The gravity values are based on the International Gravity Standardization Net 1971 (IGSN71) and the reference ellipsoid 1980 (GRS80). For detailed documentation see Technical Report No. 129.
SEG US Bouguer Gravity Anomaly Grid
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The SEG gravity data are the product of the ad hoc Gravity Anomaly Map (GAM) Committee, sponsored by the Society of Exploration Geophysicists (SEG) and the U.S. Geological Survey (USGS). The committee co-chairmen were Paul L. Lyons and Norbert W. O'Hara.
Idaho Batholith Study Area Density Grid
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A 2 kilometer terrace-density grid for the Idaho batholith study area. Number of columns is 331 and number of rows is 285. The order of the data is from the lower left to the right and then up one row.
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