Integration of Gravity Data Into a Seamless Transnational Height Model for North America Daniel Roman, Marc Véronneau, David Avalos, Xiaopeng Li, Simon.

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Presentation transcript:

Integration of Gravity Data Into a Seamless Transnational Height Model for North America Daniel Roman, Marc Véronneau, David Avalos, Xiaopeng Li, Simon Holmes, and Jianliang Huang Session 5: Paper S5-075

Gravity for the Redefinition of the American Vertical Datum (GRAV-D) Overview Not just aerogravity – Use to clean/salvage two million terrestrial data – Makes improved geoid – Must use satellite data – Yields a vertical datum Neighboring countries – Must develop a North America Model Session 5 Paper S OCT 2012 Gravity Geoid and Height Systems Venice, Italy OCT

GRAV-D Status Session 5 Paper S OCT 2012 Gravity Geoid and Height Systems Venice, Italy OCT TX09

Discussion of GRAV-D intent Goal of a cm-level accurate geoid Must meld different gravity sources To do this: must resolve systematic errors in gravity observations – Compare aerogravity to satellite data – Constrain aerogravity to GRACE/GOCE – Combined satellite & airborne gravity field model- somewhere between deg – Use aerogravity to fix errors and bridge spectral gap with terrestrial surveys – Derive shortest wavelengths from high resolution terrain and density models – Develop a seamless gravity field to 10,800 Rigorously transform to generate geoid heights and DoV’s 4 satellite models (GRACE/GOCE) terrestrial gravity airborne gravity Variance (m 2 ) Satellite-Airborne Transition Band Airborne-Terrestrial Transition Band Session 5 Paper S OCT 2012 Gravity Geoid and Height Systems Venice, Italy OCT 2012 ATTB: ( with tapers)

EGM (GOCO03S) – EGM (GRACE)

ATTB: Degrees ( )

Historical surface data agreements with EGM08

More clear Systematic features in Historical surface data, focus on long wavelength

More clear short wavelength Systematic features in Historical surface data are detected after adding airborne information

Line 3613 Line 5357 Line 2144 Line 5162

EGM2008 (GRACE Only) EGM2008 (GOCO03S) GOCO03S+Aerogravity

Summary GOCO03S benefits EGM2008 Systematic errors in terrestrial data still exist Such errors lead to systematic geoid errors Must resolve these for cm-level accuracy Aerogravity in Texas differs from terrestrial at the 3-5 mGal range Can be discerned in some terrestrial profiles Data cleaning will be required to resolve these Session 5 Paper S OCT 2012 Gravity Geoid and Height Systems Venice, Italy OCT

Alaska examples

QUESTIONS? Session 5 Paper S OCT 2012 Gravity Geoid and Height Systems Venice, Italy OCT