gov.noaa.ngdc:G01420 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (comp.) 1999 1999 Edition Boulder, CO National Geophysical Data Center http://www.ngdc.noaa.gov/mgg/gravity/ 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. To provide easy access to global and regional gravity data and related models for scientific studies. G01420 http://www.ngdc.noaa.gov/mgg/fliers/se-0703.html http://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablegri.html http://www.ngdc.noaa.gov/mgg/gravity/1999cd.html G01018 G01352-CDR-A0001 Unknown Unknown Ground Condition Complete Irregular 170 -10.75 81.16667 5.16667 NASA/GCMD Earth Science Keywords Earth Science > Solid Earth > Geodetics/Gravity > Control Surveys Earth Science > Solid Earth > Geodetics/Gravity > Gravitational Field Earth Science > Solid Earth > Geodetics/Gravity > Gravity Earth Science > Solid Earth > Geodetics/Gravity > Reference Systems Earth Science > Solid Earth > Geodetics/Gravity > Satellite Orbits Uncontrolled Keywords Absolute Gravity Bouguer Gravity Free Air Anomaly Gravity Gridded Gravity Land Gravity Observed Gravity ISO 19115 Topic Categories geoscientificInformation NASA/GCMD Data Center Keywords WDC/SEG, BOULDER > World Data Center for Solid Earth Geophysics, Boulder DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce NASA/GCMD Location Keywords North America None If you use this data, please cite the National Geophysical Data Center and the originator of the data. DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Susan McLean Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC2 325 Broadway

Boulder CO 80305-3328 USA (303) 497-6478 (303) 497-6958 (303) 497-6513 Susan.McLean@noaa.gov 7:30 - 5:00 Mountain Contact Data Center Gravity data values are the result of the measurement of small variations in the gravitational field of the Earth. The magnitudes and ranges of these variations are well known in the potential field discipline. Variable: the average acceleration on the Earth's surface is about 980 centimeters per second squared, which is equal to 980 gals, but increases by about 1/2 percent from equator to pole. Statistical analysis. Not available Not available Horizontal accuracy varies from source contributor to source contributor. However, horizontal positions are usually taken from topographic maps of the area being surveyed. Accuracy may range up to +/- 100 feet. Vertical accuracy varies from source contributor to source contributor. However, vertical positions are usually taken from topographic maps of the area being surveyed, monumented benchmark locations, or they are determined by the use of the Global Positioning System (GPS). Accuracy may range from meters to centimeters or better. National Geophysical Data Center (NGDC) Unknown varies Unknown Unknown Release date dgrav.bin Gravity survey data All data were processed by the source before being forwarded to the National Geophysical Data Center Unknown DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Susan McLean Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC2 325 Broadway

Boulder CO 80305-3328 USA (303) 497-6478 (303) 497-6958 (303) 497-6513 Susan.McLean@noaa.gov 7:30 - 5:00 Mountain Contact Data Center Raster Unknown Grid Cell 1824 4302 0.04166667 0.04166667 Decimal degrees Mean Sea Level 9999.9 Meters Attribute values Gravity grid value Binary, real number value Well established geophysical data parameters Gravity grid value Value, in milligals of an observed gravity station value, after various corrections have been applied to the value. Unknown -360 340 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce User Services Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC 325 Broadway

Boulder CO 80305-3328 USA (303) 497-6826 (303) 497-6513 ngdc.info@noaa.gov 7:30 - 5:00 Mountain Gravity While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. Binary 15693696 http://www.ngdc.noaa.gov/mgg/fliers/se-0703.html http://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablegri.html http://www.ngdc.noaa.gov/mgg/gravity/1999cd.html CD-ROM ISO 9660 Depends on the data set Prepay by check, money order or bank card. There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone. 4 Days Contact Data Center for information. Contact Data Center for information 20080207 19991211 20011010 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Susan McLean Mailing and Physical Address

NOAA/NESDIS/NGDC E/GC2 325 Broadway

Boulder CO 80305-3328 USA (303) 497-6478 (303) 497-6958 (303) 497-6513 Susan.McLean@noaa.gov 7:30 - 5:00 Mountain Contact Data Center Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 http://www.ngdc.noaa.gov/metadata/extensions/local_extensions.html NGDC Extensions to FGDC Metadata