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Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Access Info
Distribution Info
URLs
Data Quality
Lineage
Catalog Details

Summary

Short Citation
National Geodetic Survey, 2024: Airborne Gravity: NGS' Gravity Data for PN03 (2017-2018), https://www.fisheries.noaa.gov/inport/item/54188.
Full Citation Examples

Abstract

Airborne gravity data for Idaho, Montana, Washington, and Canada collected 2017-2018 over 4 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_pn03.shtml in ASCII text format.

Distribution Information

Access Constraints:

None

Use Constraints:

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

Controlled Theme Keywords

Geodetic Control Theme, GEOID CHARACTERISTICS, GEOPOTENTIAL HEIGHT, geoscientificInformation, GRAVITY/GRAVITATIONAL FIELD, MARINE GRAVITY FIELD, National Geospatial Data Asset, NGDA

Child Items

No Child Items for this record.

Contact Information

Point of Contact
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641

Metadata Contact
GRAV-D Project Manager
NGS.GRAVD@noaa.gov
240-533-9641

Extents

Geographic Area 1

-121° W, -116° E, 50.5° N, 46.25° S

Time Frame 1
2017-08 - 2018-09

Item Identification

Title: Airborne Gravity: NGS' Gravity Data for PN03 (2017-2018)
Short Name: GRAVD_PN03
Status: Completed
Creation Date: 2018
Publication Date: 2018-10
Abstract:

Airborne gravity data for Idaho, Montana, Washington, and Canada collected 2017-2018 over 4 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_pn03.shtml in ASCII text format.

Purpose:

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.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > ATMOSPHERE > ALTITUDE > GEOPOTENTIAL HEIGHT
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > MARINE GEOPHYSICS > MARINE GRAVITY FIELD
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD
ISO 19115 Topic Category
geoscientificInformation
NGDA Portfolio Themes
Geodetic Control Theme
NGDA Portfolio Themes
National Geospatial Data Asset
NGDA Portfolio Themes
NGDA
UNCONTROLLED
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
NASA/GCMD Data Center Keywords DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
NASA/GCMD Location Keywords Location > Continent > North America > Unites States of America > Montana
NASA/GCMD Platform Keywords Platform > Aircraft > King Air
NASA/GCMD Platform Keywords Platform > Aircraft > Pilatus PC-12
NASA/GCMD Platform Keywords Platform > Aircraft > Turbo Commander
NOS Data Explorer Topic Category Geodetic/Global Positioning
None airborne gravity
None datum
None ellipsoid height
None geodetic
None geoid
None geophysical
None GEOSS
None GGOS
None Global Earth Observation System of Systems
None Global Geodetic Observing system
None gravity
None height modernization
None National Spatial Reference System
None NAVD88
None North American Vertical Datum of 1988
None NSRS
None orthometric height
None spatial reference
None vertical

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MONTANA

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
GPS RECEIVERS > GPS RECEIVERS
Global Change Master Directory (GCMD) Instrument Keywords
GRAVIMETERS
Global Change Master Directory (GCMD) Instrument Keywords
IMU > INERTIAL MEASUREMENT UNIT
Global Change Master Directory (GCMD) Instrument Keywords
LRGM > Lacoste-Romberg Gravity Meter

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
ENVISAT > Environmental Satellite
Global Change Master Directory (GCMD) Platform Keywords
ERS-1 > European Remote Sensing Satellite-1
Global Change Master Directory (GCMD) Platform Keywords
ERS-2 > European Remote Sensing Satellite-2
Global Change Master Directory (GCMD) Platform Keywords
GOCE > Gravity Field and Steady-State Ocean Circulation Explorer
Global Change Master Directory (GCMD) Platform Keywords
GPS > Global Positioning System Satellites
Global Change Master Directory (GCMD) Platform Keywords
GRACE > Gravity Recovery and Climate Experiment
Global Change Master Directory (GCMD) Platform Keywords
GROUND-BASED OBSERVATIONS > GROUND-BASED OBSERVATIONS
Global Change Master Directory (GCMD) Platform Keywords
JASON-1
Global Change Master Directory (GCMD) Platform Keywords
OSTM/JASON-2 > Joint Altimetry Satellite Oceanography Network - 2
Global Change Master Directory (GCMD) Platform Keywords
TOPEX/POSEIDON > Ocean Topography Experiment

Physical Location

Organization: National Geodetic Survey
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Text files
Maintenance Frequency: As Needed
Data Presentation Form: Table (digital)
Entity Attribute Overview:

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)

Entity Attribute Detail Citation:

http://www.ngs.noaa.gov/GRAV-D/data_pn03.shtml

Distribution Liability:

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 Set Credit: GRAV-D Team

Support Roles

Data Steward

CC ID: 787533
Date Effective From: 2017-06
Date Effective To:
Contact (Position): GRAV-D Project Manager
Email Address: NGS.GRAVD@noaa.gov
Phone: 240-533-9641
Fax: 301-713-4327

Distributor

CC ID: 787535
Date Effective From: 2017-06
Date Effective To:
Contact (Position): GRAV-D Project Manager
Email Address: NGS.GRAVD@noaa.gov
Phone: 240-533-9641
Fax: 301-713-4327

Metadata Contact

CC ID: 787536
Date Effective From: 2017-06
Date Effective To:
Contact (Position): GRAV-D Project Manager
Email Address: NGS.GRAVD@noaa.gov
Phone: 240-533-9641
Fax: 301-713-4327

Point of Contact

CC ID: 787534
Date Effective From: 2017-06
Date Effective To:
Contact (Position): GRAV-D Project Manager
Email Address: NGS.GRAVD@noaa.gov
Phone: 240-533-9641
Fax: 301-713-4327

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 787531
W° Bound: -121
E° Bound: -116
N° Bound: 50.5
S° Bound: 46.25

Extent Group 1 / Time Frame 1

CC ID: 787530
Time Frame Type: Range
Start: 2017-08
End: 2018-09

Access Information

Security Class: Unclassified
Data Access Procedure:

https://www.ngs.noaa.gov/grav-d/data_products.shtml

Data Access Constraints:

None

Data Use Constraints:

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

Distribution Information

Distribution 1

CC ID: 787537
Download URL: http://www.ngs.noaa.gov/GRAV-D/data_pn03.shtml
Distributor:
Description:

Downloadable Data

File Type (Deprecated): ASCII
Distribution Format: Text (Unstructured)
Compression: Zip

URLs

URL 1

CC ID: 787538
URL: http://www.ngs.noaa.gov/GRAV-D/data_pn03.shtml
URL Type:
Online Resource

URL 2

CC ID: 787539
URL: http://www.ngs.noaa.gov/GRAV-D/data_products.shtml
URL Type:
Online Resource

URL 3

CC ID: 787540
URL: http://www.ngs.noaa.gov/
URL Type:
Online Resource

Data Quality

Accuracy:

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 4.00 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 99.59%. 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_pn03.shtml.

Completeness Report:

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_pn03.shtml.

Conceptual Consistency:

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_pn03.shtml.

Quality Control Procedures Employed:

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_pn03.shtml.

Lineage

Sources

Raw GPS Data from GRAV-D surveys ID17-1, OR17-2, WA18-1 and WA18-2.

CC ID: 787544
Extent Type: Range
Extent Start Date/Time: 2017-08
Extent End Date/Time: 2018-09

Raw Gravity Data from GRAV-D surveys ID17-1, OR17-2, WA18-1 and WA18-2.

CC ID: 787543
Contact Name: NOAA's National Geodetic Survey
Extent Type: Range
Extent Start Date/Time: 2017-08
Extent End Date/Time: 2018-09

Process Steps

Process Step 1

CC ID: 787545
Description:

GPS data processed using NovAtel Waypoint Inertial Explorer 8.7 from GRAV-D Ssurveys ID17-1, OR17-2, WA18-1 and WA18-2.

Process Contact: GRAV-D Project Manager
Phone (Voice): 240-533-9641
Email Address: NGS.GRAVD@noaa.gov
Source: Raw GPS Data from GRAV-D surveys ID17-1, OR17-2, WA18-1 and WA18-2.

Process Step 2

CC ID: 787546
Description:

Gravity data from GRAV-D surveys ID17-1, OR17-2, WA18-1 and WA18-2 processed using NGS software Newton v1.4

Process Contact: GRAV-D Project Manager
Phone (Voice): 240-533-9641
Email Address: NGS.GRAVD@noaa.gov
Source: Raw Gravity Data from GRAV-D surveys ID17-1, OR17-2, WA18-1 and WA18-2.

Catalog Details

Catalog Item ID: 54188
GUID: gov.noaa.nmfs.inport:54188
Metadata Record Created By: Jeff Johnson
Metadata Record Created: 2018-10-16 14:12+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-10-17 16:12+0000
Metadata Record Published: 2018-10-17
Owner Org: NGS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-10-17
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-10-17