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