39705
Airborne Gravity: NGS' Gravity Data for AN08 (2016)
GRAVD_AN08
Data Set
Published / External
37222
GRAV-D_project
Project
Completed
2016-10
Airborne gravity data for Alaska collected in 2016 over one survey. This data set is part of the Gravity for the Re-definition of the American Vertical Datum (GRAV-D) project initiated by NOAA's National Geodetic Survey to collect and monitor gravity data suitable for the re-definition of the vertical datum for at least the United States and territories. The data is available at http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml in ASCII text format.
These data sets were collected and processed by NOAA's National Geodetic Survey (www.ngs.noaa.gov) as part of its GRAV-D effort to modernize the U.S. vertical datum. The purpose of these data is to provide accurate gravity data for geoid modeling for the U.S. and its territories. It was designed to provide medium wavelength gravity information (around 20-400 km) to connect satellite and ground gravity measurements.
1260
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > ATMOSPHERE > ALTITUDE > GEOPOTENTIAL HEIGHT
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > MARINE GEOPHYSICS > MARINE GRAVITY FIELD
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD
Theme
ISO 19115 Topic Category
geoscientificInformation
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
Instrument
Global Change Master Directory (GCMD) Instrument Keywords
GPS RECEIVERS > GPS RECEIVERS
Instrument
Global Change Master Directory (GCMD) Instrument Keywords
GRAVIMETERS
Instrument
Global Change Master Directory (GCMD) Instrument Keywords
IMU > INERTIAL MEASUREMENT UNIT
Instrument
Global Change Master Directory (GCMD) Instrument Keywords
LRGM > Lacoste-Romberg Gravity Meter
Platform
Global Change Master Directory (GCMD) Platform Keywords
ENVISAT > Environmental Satellite
Platform
Global Change Master Directory (GCMD) Platform Keywords
ERS-1 > European Remote Sensing Satellite-1
Platform
Global Change Master Directory (GCMD) Platform Keywords
ERS-2 > European Remote Sensing Satellite-2
Platform
Global Change Master Directory (GCMD) Platform Keywords
GOCE > Gravity Field and Steady-State Ocean Circulation Explorer
Platform
Global Change Master Directory (GCMD) Platform Keywords
GPS > Global Positioning System Satellites
Platform
Global Change Master Directory (GCMD) Platform Keywords
GRACE > Gravity Recovery and Climate Experiment
Platform
Global Change Master Directory (GCMD) Platform Keywords
GROUND-BASED OBSERVATIONS > GROUND-BASED OBSERVATIONS
Platform
Global Change Master Directory (GCMD) Platform Keywords
JASON-1
Platform
Global Change Master Directory (GCMD) Platform Keywords
OSTM/JASON-2 > Joint Altimetry Satellite Oceanography Network - 2
Platform
Global Change Master Directory (GCMD) Platform Keywords
TOPEX/POSEIDON > Ocean Topography Experiment
Theme
NASA/GCMD Data Center Keywords
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Theme
NASA/GCMD Data Center Keywords
Data Center > Government Agencies-U.S. Federal Agencies > DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce
Theme
NASA/GCMD Platform Keywords
Platform > Aircraft > King Air 200T
Theme
NOS Data Explorer Topic Category
Geodetic/Global Positioning
Theme
GEOSS
Theme
GGOS
Theme
Global Earth Observation System of Systems
Theme
Global Geodetic Observing system
Theme
NAVD88
Theme
NSRS
Theme
National Spatial Reference System
Theme
North American Vertical Datum of 1988
Theme
airborne gravity
Theme
datum
Theme
ellipsoid height
Theme
geodetic
Theme
geoid
Theme
geophysical
Theme
gravity
Theme
height modernization
Theme
orthometric height
Theme
spatial reference
Theme
vertical
Spatial
NASA/GCMD Location Keywords
Location > Ocean > Chukchi Sea
National Geodetic Survey
Silver Spring
MD
Data Set
As Needed
Table (digital)
The ASCII text file provides a single processed observation per row with the following elements comma separated: year, month, day, hour, minutes, seconds, latitude (dd), longitude (dd), ellipsoid height (m), full field gravity at altitude (mGals), full field EGM08 gravity at altitude (mGal)
http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml
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.
Data Steward
2016-10
Organization
NGS Communications and Outreach Branch
ngs.infocenter@noaa.gov
(301) 713-3242
(301) 713-4172
Distributor
2016-10
Organization
NGS Communications and Outreach Branch
ngs.infocenter@noaa.gov
(301) 713-3242
(301) 713-4172
Metadata Contact
2016-10
Organization
NGS Communications and Outreach Branch
ngs.infocenter@noaa.gov
(301) 713-3242
(301) 713-4172
Point of Contact
2016-10
Organization
NGS Communications and Outreach Branch
ngs.infocenter@noaa.gov
(301) 713-3242
(301) 713-4172
Ground Condition
-169.46
-158.29
69.24
64.6
Range
2016-05
2016-07
Yes
Yes
172203
Unclassified
None
Must read and fully comprehend the metadata prior to use, acknowledgment of the Originator when using the data set as a source, data should not be used beyond the limits of the source scale
http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml
Downloadable Data
ASCII
Text (Unstructured)
Uncompressed
http://www.ngs.noaa.gov/
Online Resource
http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml
Online Resource
http://www.ngs.noaa.gov/GRAV-D/data_products.shtml
Online Resource
2016-10-04
Date that the source FGDC record was last modified.
2017-04-05
Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.
2017-09-13
Partial upload of Spatial Info section only.
2017-11-01
Replaced entire Lineage section to populate new Source Contribution field.
2018-02-08
Partial upload of Positional Accuracy fields only.
The absolute accuracy of airborne gravity is difficult to quantify. The following measures are indicators of data quality, but are not definitive measures. The cross over precision is 0.19 mGals, which is a combination of differences between cross track and data track and may not be indicative of data quality. Adjacent data lines have an average cross-correlation of 99.72%. Low correlation between adjacent lines may indicate either poor quality on one of the two lines or rapidly changing features. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml.
GPS horizontal positions are good to 0.005 meters average standard deviation. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml.
GPS vertical positions are good to 0.008 meters average standard deviation. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml.
Due to the altitude, speed of data collection, and track spacing of 10 kilometers the resolution of these data are limited to 20 kilometers. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml.
Data processing is fully automated and output file is computer generated. All lines are checked by an analyst and any errors in production are corrected. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_an08.shtml.
Gravity Data from Flight AK16-2
NOAA's National Geodetic Survey
Range
2016-05
2016-07
Airborne gravity survey, including data collection from airborne and ground GPS, IMUs, and gravimeters, that was included in this geographic block | Source Geospatial Form: tabular digital data | Type of Source Media: digital
Processed GPS Data from Flight AK16-2
NOAA's National Geodetic Survey
Range
2016-05
2016-07
Processed GPS data is created from tying kinematic GPS data from the plane to base stations on the ground and is used to process and tie gravity measurements | Type of Source Media: digital
1
GPS data processed using Inertial Explorer 8.5 | Source Produced: Processed GPS Data from Flight AK16-2
2013-10-01T00:00:00
Gravity Data from Flight AK16-2
2
Gravity data processed using NGS software Newton | Source Produced: Processed GPS Data from Flight AK16-2
2013-10-01T00:00:00
Gravity Data from Flight AK16-2
gov.noaa.nmfs.inport:39705
Tyler Christensen
2017-04-05T13:06:45
SysAdmin InPortAdmin
2023-10-17T16:12:12
2018-02-08
National Geodetic Survey
NGS
1002
Public
No
2018-02-08
1 Year
2019-02-08