Airborne Gravity: NGS' Gravity Data for EN04 (2013)
Data Set (DS) | National Geodetic Survey (NGS)GUID: gov.noaa.nmfs.inport:39723 | Updated: October 17, 2023 | Published / External
Summary
Short Citation
National Geodetic Survey, 2024: Airborne Gravity: NGS' Gravity Data for EN04 (2013), https://www.fisheries.noaa.gov/inport/item/39723.
Full Citation Examples
Airborne gravity data for Michigan and Lake Huron collected in 2012 over 1 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_en04.shtml in ASCII text format.
Distribution Information
-
Text (Unstructured)
Downloadable Data
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
Controlled Theme Keywords
GEOID CHARACTERISTICS, GEOPOTENTIAL HEIGHT, geoscientificInformation, GRAVITY/GRAVITATIONAL FIELD, MARINE GRAVITY FIELD
Child Items
No Child Items for this record.
Contact Information
Point of Contact
NGS Communications and Outreach Branch
ngs.infocenter@noaa.gov
(301) 713-3242
Metadata Contact
NGS Communications and Outreach Branch
ngs.infocenter@noaa.gov
(301) 713-3242
Extents
-84.2° W,
-79.9° E,
47.4° N,
42.9° S
2012-08 - 2012-09
Item Identification
Title: | Airborne Gravity: NGS' Gravity Data for EN04 (2013) |
---|---|
Short Name: | GRAVD_EN04 |
Status: | Completed |
Publication Date: | 2013-07 |
Abstract: |
Airborne gravity data for Michigan and Lake Huron collected in 2012 over 1 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_en04.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. |
Notes: |
1278 |
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
|
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 |
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 > CANADA > ONTARIO
|
Global Change Master Directory (GCMD) Location Keywords |
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MICHIGAN
|
UNCONTROLLED | |
None | Location > Continent > North America > Lake Huron |
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 |
CESSNA CITATION II
|
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 |
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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_en04.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. |
Support Roles
Data Steward
Date Effective From: | 2013-07 |
---|---|
Date Effective To: | |
Contact (Organization): | NGS Communications and Outreach Branch |
Email Address: | ngs.infocenter@noaa.gov |
Phone: | (301) 713-3242 |
Fax: | (301) 713-4172 |
Distributor
Date Effective From: | 2013-07 |
---|---|
Date Effective To: | |
Contact (Organization): | NGS Communications and Outreach Branch |
Email Address: | ngs.infocenter@noaa.gov |
Phone: | (301) 713-3242 |
Fax: | (301) 713-4172 |
Metadata Contact
Date Effective From: | 2013-07 |
---|---|
Date Effective To: | |
Contact (Organization): | NGS Communications and Outreach Branch |
Email Address: | ngs.infocenter@noaa.gov |
Phone: | (301) 713-3242 |
Fax: | (301) 713-4172 |
Point of Contact
Date Effective From: | 2013-07 |
---|---|
Date Effective To: | |
Contact (Organization): | NGS Communications and Outreach Branch |
Email Address: | ngs.infocenter@noaa.gov |
Phone: | (301) 713-3242 |
Fax: | (301) 713-4172 |
Extents
Currentness Reference: | Ground Condition |
---|
Extent Group 1
Extent Group 1 / Geographic Area 1
W° Bound: | -84.2 | |
---|---|---|
E° Bound: | -79.9 | |
N° Bound: | 47.4 | |
S° Bound: | 42.9 |
Extent Group 1 / Time Frame 1
Time Frame Type: | Range |
---|---|
Start: | 2012-08 |
End: | 2012-09 |
Spatial Information
Spatial Representation
Representations Used
Vector: | Yes |
---|
Vector Representation 1
Curve Object Present?: | Yes |
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Curve Object Count: | 114969 |
Access Information
Security Class: | Unclassified |
---|---|
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
Download URL: | http://www.ngs.noaa.gov/GRAV-D/data_en04.shtml |
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Distributor: | |
Description: |
Downloadable Data |
File Type (Deprecated): | ASCII |
Distribution Format: | Text (Unstructured) |
Compression: | Uncompressed |
URLs
URL 1
URL: | http://www.ngs.noaa.gov/GRAV-D/data_en04.shtml |
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URL Type: |
Online Resource
|
URL 2
URL: | http://www.ngs.noaa.gov/GRAV-D/data_products.shtml |
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URL Type: |
Online Resource
|
URL 3
URL: | http://www.ngs.noaa.gov/ |
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URL Type: |
Online Resource
|
Activity Log
Activity Log 1
Activity Date/Time: | 2013-07-23 |
---|---|
Description: |
Date that the source FGDC record was last modified. |
Activity Log 2
Activity Date/Time: | 2017-04-05 |
---|---|
Description: |
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. |
Activity Log 3
Activity Date/Time: | 2017-09-13 |
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Description: |
Partial upload of Spatial Info section only. |
Activity Log 4
Activity Date/Time: | 2017-11-01 |
---|---|
Description: |
Replaced entire Lineage section to populate new Source Contribution field. |
Activity Log 5
Activity Date/Time: | 2018-02-08 |
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Description: |
Partial upload of Positional Accuracy fields only. |
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 2.43 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 99.96%. 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_en04.shtml. |
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Horizontal Positional Accuracy: |
GPS horizontal positions are good to 0.017 meters average standard deviation. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_en04.shtml. |
Vertical Positional Accuracy: |
GPS vertical positions are good to 0.015 meters average standard deviation. More detailed information can be found at http://www.ngs.noaa.gov/GRAV-D/data_en04.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_en04.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_en04.shtml. |
Lineage
Sources
Processed GPS Data from MI12 Survey
Contact Name: | NOAA's National Geodetic Survey |
---|---|
Extent Type: | Range |
Extent Start Date/Time: | 2012-08 |
Extent End Date/Time: | 2012-09 |
Source Contribution: |
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 |
Raw Gravity and GPS Data from MI12 Survey
Contact Name: | NOAA's National Geodetic Survey |
---|---|
Extent Type: | Range |
Extent Start Date/Time: | 2012-08 |
Extent End Date/Time: | 2012-09 |
Source Contribution: |
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 |
Process Steps
Process Step 1
Description: |
GPS data processed using Inertial Explorer 8.5 | Source Produced: Processed GPS Data from MI12 Survey |
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Process Date/Time: | 2013-07-01 00:00:00 |
Source: | Raw Gravity and GPS Data from MI12 Survey |
Process Step 2
Description: |
Gravity data processed using NGS software Newton. |
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Process Date/Time: | 2013-07-01 00:00:00 |
Source: | Processed GPS Data from MI12 Survey |
Catalog Details
Catalog Item ID: | 39723 |
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GUID: | gov.noaa.nmfs.inport:39723 |
Metadata Record Created By: | Tyler Christensen |
Metadata Record Created: | 2017-04-05 13:06+0000 |
Metadata Record Last Modified By: | SysAdmin InPortAdmin |
Metadata Record Last Modified: | 2023-10-17 16:12+0000 |
Metadata Record Published: | 2018-02-08 |
Owner Org: | NGS |
Metadata Publication Status: | Published Externally |
Do Not Publish?: | N |
Metadata Last Review Date: | 2018-02-08 |
Metadata Review Frequency: | 1 Year |
Metadata Next Review Date: | 2019-02-08 |