ERS-1/2 Gravity Field Model Product

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: ERS-1/2 Gravity Field Model Product
Description:
Abstract:
The gravitational geopotential produces the principal acceleration on Earth. Therefore a precise orbit restitution applying dynamic methods requires a precise model of the geopotential with resolution requirements depending on the altitude of the satellite. The gravitational acceleration is the gradient of the gravitational geopotential. Selected ocean tide parameters and geocentric coordinates of the satellites tracking stations are estimated simultaneously. The gravity field models are available from by processing ERS-1 data up to 1994. The product is no longer produced operationally, but copies are available. Input: - non-ERS Earth gravity model (satellite-only, including data from about 30 satellites) - ERS-1 laser range data of the ERS-1 commissioning phase - tracking station survey ties - a-priori degree variance models Output: Spherical harmonic coefficients of the expansion of the geopotential in spherical harmonics, ocean tide parameters and geocentric coordinates of the satellite tracking stations. Product characteristics: ----------------- Spatial Coverage: global Spatial Resolution: spherical harmonic expansion of the gravitational geopotential complete to degree n=50 and orderm=50 plus higher degree coefficients within order 0 (zonals) and resonant order 12,28 and 43 --------------- To order data please see "http://earth.esa.int/helpandmail/help_order.html"
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19910730
Ending_Date: Unknown
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -180.0
East_Bounding_Coordinate: 180.0
North_Bounding_Coordinate: 82.0
South_Bounding_Coordinate: -82.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword: EARTH SCIENCE > OCEANS > COASTAL PROCESSES > TIDAL HEIGHT
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE GEOPHYSICS > MARINE GRAVITY FIELD
Theme_Keyword: EARTH SCIENCE > OCEANS > TIDES > TIDAL HEIGHT
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY
Theme_Keyword: EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > SATELLITE ORBITS/REVOLUTION
Theme_Keyword: ERS-1 > EUROPEAN REMOTE SENSING SATELLITE-1
Theme_Keyword: ERS-2 > EUROPEAN REMOTE SENSING SATELLITE-2
Theme_Keyword: PRARE > PRECISE RANGE AND RANGE-RATE EQUIPMENT
Theme_Keyword: Gravity
Theme_Keyword: Orbit
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: OCEANS
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: GEOGRAPHIC REGION > GLOBAL
Access_Constraints: Not Available
Use_Constraints:
Not Available
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The quality of a model is described by a vector of characteristic statistical numbers derived from the comparison of various quantities and error propagation: - computation of orbital fits to tracking observations of various satellites and to crossover differences - comparison of computed and observed geostationary satellite longitude accelerations, of lumped coefficients (pseudo-observations) - comparison of model coefficients, mean gravity anomalies and geoid undulations derived from the gravity model's coefficients and those of other models - computation of the rms of estimated standard deviations derived from rigorous error propagation of the coefficients' variance-covariance matrix to mean gravity anomalies, to mean geoid heights and to radial orbit perturbations.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: ESA/EARTHNET > Earthnet Online, European Space Agency
Contact_Person: EARTH OBSERVATION HELP DESK
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: ESA/ESRIN
Address: Via G. Galilei
City: Frascati
Postal_Code: 00044
Country: Italy
Contact_Voice_Telephone: +39 06 94180777
Contact_Facsimile_Telephone: +39 06 94180292
Contact_Electronic_Mail_Address: eohelp@esa.int
Resource_Description: ORB.EGM
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://earth.esa.int
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date:
Metadata_Review_Date: 20050615
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: EARTH OBSERVATION HELP DESK
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: ESA/ESRIN
Address: Via G. Galilei
City: Frascati
Postal_Code: 00044
Country: Italy
Contact_Voice_Telephone: +39 06 94180777
Contact_Facsimile_Telephone: +39 06 94180292
Contact_Electronic_Mail_Address: eohelp@esa.int
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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