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resourceProvider |
https://epsg.org/crs_5715/MSL-depth.html |
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Susan Mclean (processor) |
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processor |
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Brian Meyer |
Brian Meyer |
NOAA National Centers for Environmental Information |
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Brian.Meyer@noaa.gov |
pointOfContact |
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User Services (publisher) |
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DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA,
U.S. Department of Commerce |
User Services |
ngdc.info@noaa.gov |
publisher |
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User Services (originator) |
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DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA,
U.S. Department of Commerce |
User Services |
ngdc.info@noaa.gov |
originator |
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User Services |
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DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA,
U.S. Department of Commerce |
User Services |
ngdc.info@noaa.gov |
distributor |
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DOI/USGS |
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DOI/USGS > U.S. Geological Survey, U.S. Department of the Interior |
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originator |
http://www.usgs.gov/ask/index.php |
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EPSG Registry |
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European Petroleum Survey Group |
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publisher |
https://epsg.org/home.html |
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GCMD Landing Page |
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NASA Goddard Space Flight Center, Earth Science Data and Information System |
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custodian |
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords |
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NCEI (publisher) |
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NOAA National Centers for Environmental Information |
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publisher |
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Anna Milan |
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NOAA National Centers for Environmental Information |
Metadata Specialist |
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editor |
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http://www.usgs.gov/ask/index.php |
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https://epsg.org/crs_5715/MSL-depth.html |
MSL depth |
GML for Vertical CRS in EPGS Registry. |
information |
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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 |
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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 |
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https://www.ngdc.noaa.gov/mgg/fliers/se-0703.html |
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https://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablereg.html |
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https://www.ngdc.noaa.gov/mgg/gravity/1999cd.html |
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latitude |
This is the geographic latitude expressed as a decimal number. The units are degrees.
The range is -90.0 to +90.0. |
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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. |
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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. |
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obs_grav |
The observed, or measured value of gravity in mGals at an occupied gravity station. |
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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. |
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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. |
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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). |
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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. |