comparison of gravimetric geoid models over the great lakes region daniel r. roman and xiaopeng li
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Comparison of Gravimetric Geoid Models Over the Great Lakes Region
Daniel R. Roman and Xiaopeng Li
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Surface Gravity ObservationsSaleh et al. (2012) Fig. 11 Biases of all 244 significantly biased surveys
Saleh et al. (2012) Fig. 12 The effect of significant gravity biases on the geoid
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Collection in August 2013, very likely to complete
Collection possible in Aug/Sept 2013,
unlikely to complete
Collection in Sept/Oct 2013, likely to complete
Gravity for the Redefinition of the American Vertical Datum (GRAV-D)Great Lakes Airborne Gravity Collection Effort
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Aerogravity – GOCE DIR Rel. 4
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Great Lakes GPSBM Locations (NAVD 88)
Alternatives:
• SEPT 12
• NOV 07
• Min. Constr. GPSBM’s (WI)
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Great Lakes Errors: SatelliteDegree Cutoff vs. GPSBM’s
Two separate nadir points at degrees100 and 180: must try both
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Great Lakes Errors: AerogravityDegree Cutoff vs. GPSBM’s
Degree 280 yields lowest overall error as EGM2008 is cut in at higher harmonics
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2.E GRAV-D Surface Gravity Error Detection and Cleaning
• Check terrestrial gravity at suspect sites noted by Saleh et al. (2012)
• Determine and remove potential biases trends in 40 km and longer bandwidth
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Errors Detected by GOCE DIR Rel. 4
Location is western New York State and the southeastern portion of Lake Ontario
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Errors Detected by Aerogravity
Location is western New York State and the southeastern portion of Lake Ontario
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Surface Gravity Anomalies (SGA)
Location is western New York State and the southeastern portion of Lake Ontario
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SGA – EGM2008 quiet
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SGA – EGM2008/GOCE-DIR R. 4noise
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SGA – EGM2008/GOCE/Aerogravitynoiser
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CGG2013M8 – CGG2010
Model 8:
• GOCE DIR Release 4
• Surface gravity
• Modified Kernel with Cosine filter between 140-200
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CGG2013M8 – USGG2012
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4. Conclusions
• Aerogravity bridges the gap between satellite and surface gravity data
• Suspect surface gravity data was confirmed• Assessment of cleaning of surface data and
potential impact is ongoing• With adoption of common W0 and use of
aerogravity to constrain middle wavelengths, a common gravity field model is possible
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5. Future Work
• Use NOV 07, SEPT 12, & M.C. GPSBM to model• Test all surface gravity data in region• Develop regional model spanning same region
as CGG2013• Compare final CGG2013 against USGG2012,
XGG13D, and any follow-on models• Test against tide gauges/MODT• Water level gauges on Lakes