57092
Airborne Gravity: NGS' Gravity Data for PS04 (2016 - 2019)
GRAVD_PS04
Data Set
Published / External
37222
GRAV-D_project
Project
Completed
2019
2019-07
Airborne gravity data for coastal southern California collected 2016-2019 over 2 surveys. 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_ps04.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.
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
Theme
NGDA Portfolio Themes
Geodetic Control Theme
Theme
NGDA Portfolio Themes
NGDA
Theme
NGDA Portfolio Themes
National Geospatial Data Asset
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
Theme
NASA/GCMD Platform Keywords
Platform > Aircraft > Turbo Commander
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
National Geodetic Survey
Silver Spring
MD
Data Set
Text files
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_ps04.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.
GRAV-D Team
NovAtel SPAN or PP7 (GNSS Receiver) or Applanix POS AV 510, NovAtel DL-V3 or DL-4 Plus (GNSS Receiver), Honeywell (IMU), Micro-g LaCoste TAGS (Relative Gravimeter), Micro-g LaCoste A10 (Absolute Gravimeter), LaCoste and Romberg G-meter or Sintrex CG-6 (Relative Gravimeter for gradient)
King Air, Turbo Commander
N/A
Data Steward
2017-06
Position
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641
301-713-4327
Distributor
2017-06
Position
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641
301-713-4327
Metadata Contact
2017-06
Position
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641
301-713-4327
Point of Contact
2017-06
Position
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641
301-713-4327
Ground Condition
-122
-113.5
34.25
32.5
Range
2016-11
2019-07
Unclassified
https://www.ngs.noaa.gov/grav-d/data_products.shtml
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
2019-07-31
http://www.ngs.noaa.gov/GRAV-D/data_ps04.shtml
2017-06
Position
GRAV-D Project Manager
NGS_GRAVD_Block_PS04_BETA1.txt
Downloadable Data
2019-07-26T10:28:00
ASCII
Text (Unstructured)
7.73 MB
Newton v1.4
Zip
http://www.ngs.noaa.gov/
Online Resource
http://www.ngs.noaa.gov/GRAV-D/data_products.shtml
Online Resource
http://www.ngs.noaa.gov/GRAV-D/data_ps04.shtml
Online Resource
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 3.05 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 94.93%. 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_ps04.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_ps04.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_ps04.shtml.
Data are processed shortly after flying to ensure that all instruments are working and data quality is acceptable. Field personnel perform data checks at least once per day to ensure all GPS receivers, the gravimeter, and IMUs are working up to standard. The field personnel also process GPS and gravity data, mapping the preliminary gravity product, to check quality. Additional quality control plots are built into the GPS and gravity processing software packages for advanced data analysis in the field.
After processing data are compared to an existing geoid model. In addition processed gravity is compared at common points from several flight lines crossing the survey lines to verify consistent gravity measurements in the same location.. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_ps04.shtml.
Raw GPS Data from GRAV-D surveys CA16-1 and CA19-1.
Organization
National Geodetic Survey
Originator
2019-07-31
Range
2016-11
2019-07
Raw Gravity Data from GRAV-D surveys CA16-1 and CA19-1.
Organization
NOAA's National Geodetic Survey
Originator
2019-07-31
Range
2016-11
2019-07
1
GPS data processed using NovAtel Waypoint Inertial Explorer 8.7 from GRAV-D surveys CA16-1 and CA19-1.
Position
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641
301-713-4327
Raw GPS Data from GRAV-D surveys CA16-1 and CA19-1.
2
Gravity data from GRAV-D surveys CA16-1 and CA19-1 processed using NGS software Newton v1.4
Position
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641
301-713-4327
Raw Gravity Data from GRAV-D surveys CA16-1 and CA19-1.
gov.noaa.nmfs.inport:57092
Jeff Johnson
2019-07-26T13:37:47
SysAdmin InPortAdmin
2023-10-17T16:12:19
2019-07-30
National Geodetic Survey
NGS
1002
Public
No
2019-07-30
1 Year
2020-07-30