gov.noaa.ngdc.mgg.geophysics:G01475 eng; USA utf8 dataset Brian Meyer NOAA National Centers for Environmental Information 303-497-6125 Brian.Meyer@noaa.gov pointOfContact 2017-09-25 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) point 5905 Mean Sea Level depth MSL depth 2012-08-10 revision https://epsg.org/crs_5715/MSL-depth.html MSL depth GML for Vertical CRS in EPGS Registry. information resourceProvider European Petroleum Survey Group https://epsg.org/home.html European Petroleum Survey Group Geodetic Parameter Registry Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. search publisher urn:ogc:def:crs:EPSG::5715 Gravity Data For The Maryland/Virginia Area 1999-01-01 publication 1999 Edition NOAA National Centers for Environmental Information publisher DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services 303-497-6826 303-497-6513 325 Broadway Boulder CO 80305-3328 USA ngdc.info@noaa.gov 8am-5pm, Monday through Friday publisher DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services 303-497-6826 303-497-6513 325 Broadway Boulder CO 80305-3328 USA ngdc.info@noaa.gov 8am-5pm, Monday through Friday originator The gravity station data (5,905 records) were compiled by the U. S. Geological Survey. This data base was received on July 11, 1997. Principal gravity parameters include observed gravity, Free-air anomalies and Bouguer anomalies. The Bouguer gravity anomaly values were computed using the 1967 gravity formula (International Association of Geodesy, 1971). See Open-File Report 90-265 for further information. To provide easy access to global and regional gravity data and related models for scientific studies. completed Brian Meyer NOAA National Centers for Environmental Information 303-497-6125 Brian.Meyer@noaa.gov pointOfContact irregular 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 theme Global Change Master Directory (GCMD) Science Keywords 2020-01-09 publication 9.1 NASA Goddard Space Flight Center, Earth Science Data and Information System https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information custodian Absolute Gravity Bouguer Gravity Free Air Anomaly Gridded Gravity Land Gravity Observed Gravity theme Uncontrolled Keywords ICSU-WDS > International Council for Science - World Data System project Global Change Master Directory (GCMD) Project Keywords 2020-01-09 publication 9.1 NASA Goddard Space Flight Center, Earth Science Data and Information System https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information custodian Continent>North America>United States of America>Maryland place Global Change Master Directory (GCMD) Location Keywords 2020-01-09 publication 9.1 NASA Goddard Space Flight Center, Earth Science Data and Information System https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information custodian DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2020-01-09 publication 9.1 NASA Goddard Space Flight Center, Earth Science Data and Information System https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information custodian otherRestrictions Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data. otherRestrictions Access Constraints: None grid eng; USA geoscientificInformation -79.4793 -75.7073 38.0388 39.9992 latitude This is the geographic latitude expressed as a decimal number. The units are degrees. The range is -90.0 to +90.0. 39.9992 38.0388 degrees degrees longitude_min The minute portion of the longitude when the longitude is given in degrees, minutes, and seconds. Values range from 0 to less than 60. -75.7073 -79.4793 degrees degrees sea_level_elev_ft Height of the surface of observation above sea level, in feetNOTE: most often from terrain surface but may be from lake surface. 3040.0 -0.9 Feet Feet obs_grav The observed, or measured value of gravity in mGals at an occupied gravity station. 980154.75 979879.60 milligals milligals terr_corr The terrain correction is an adjustment to the simple Bouguer correction that accounts for variations in terrain above and below the elevation of the gravity station at distances away from the point of measurement. Terrain below and above the level of the theoretical horizontal slab used to make the simple Bouguer correction results in a mass deficiency or excess that always yields an erroneously low gravity measurement at the point of observation. As a consequence, the terrain correction is always added to the simple Bouguer correction. 5.59 -0.12 milligals milligals curvature_corr The Bouguer gravity correction assumes that the mass between the measurement elevation and sea level can be approximated by an infinite slab (often using a slab density of 2.67 grams per cc). The curvature correction is subtracted from the Bouguer gravity correction and compensates for the mass of this slab which extends beyond the curvature of the Earth. The U.S. Geological Survey computes it as follows: curvature_corr = elev*(1.4639108e-3+elev*(4.449648e-14*elev-3.532715e-7))Where elev is the elevation of the gravity station in meters and the curvature correction is in units of milligals. This correction rarely exceeds a few tenths of a milligal and is often omitted. 0.00 -1.05 milligals milligals Free_air_anom The anomalous gravity difference between an observed value and theoretical value. The gravity data has been corrected for latitude and elevation (free-air correction), but not for the density of the rock between datum and the plane of measurement (Bouguer correction). 59.27 -53.89 milligals milligals Bouguer_anom The residual value obtained after latitude correction, elevation correction (including both free-air and Bouguer corrections) and terrain corrections have been applied to gravity data. In many situations the terrain correction is assumed to be zero. When this is explicitly documented, the term " Simple Bouguer Anomaly " is often used. When one explicitly documents that the terrain correction has been applied the term " Complete Bouguer Anomaly " is often used. 47.15 -74.61 milligals milligals true Entity and Attribute Information Entity and Attribute Overview: Unavailable Entity and Attribute Detail Citation: See section 2.5.2 Binary DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services 303-497-6826 303-497-6513 325 Broadway Boulder CO 80305-3328 USA ngdc.info@noaa.gov 8am-5pm, Monday through Friday distributor Depends on the data set Ordering Instructions: Price information is available upon request. 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. Custom Order Process: Contact Data Center for information. 4 Days 242105 https://www.ngdc.noaa.gov/mgg/fliers/se-0703.html https://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablereg.html https://www.ngdc.noaa.gov/mgg/gravity/1999cd.html cdRom iso9660 iso9660 repository NOAA National Centers for Environmental Information NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. 2015-04-22T00:00:00 dataset Horizontal Positional Accuracy Report 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 Positional Accuracy Report 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. Not available Not available Quantitative Attribute Accuracy Assessment Statistical analysis. 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. meters 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. All data was processed by the source before being forwarded to the National Geophysical Data Center processor Source Contribution: Gravity survey data Source Type: varies Gravity Data For The Maryland/Virginia Area publication DOI/USGS > U.S. Geological Survey, U.S. Department of the Interior (703) 648-5953 12201 Sunrise Valley Drive Reston VA 20192 USA http://www.usgs.gov/ask/index.php originator annually 2011-04-23 This metadata was automatically generated from the Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2012-08-08 version of the FGDC RSE to ISO 19115-2 transform. Translated from FGDC 2012-10-10T10:32:43.126-06:00 Last Metadata Review Date: 2017-09-25 This record has been automatically modified to include references to NCEI where applicable on 2015-09-01. NOAA National Centers for Environmental Information Metadata Specialist editor Brian Meyer NOAA National Centers for Environmental Information 303-497-6125 Brian.Meyer@noaa.gov pointOfContact