Using Aerogravity to Produce a Refined Vertical Datum D.R. Roman and X. Li XXV FIG Congress 16-21 June 2014 Kuala Lumpur, Malaysia Session TS01A, Paper.

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Presentation transcript:

Using Aerogravity to Produce a Refined Vertical Datum D.R. Roman and X. Li XXV FIG Congress June 2014 Kuala Lumpur, Malaysia Session TS01A, Paper 7303

Gravity Field Power Spectrum Power Spectrum plot of gravity field (blue line). Most power is at longest wavelengths (λ) at left on the lowest degree harmonics, where satellite (light blue bar) data dominate. Surface data (brown bar) contain the shortest to the right. Aerogravity (green bar) overlaps both parts of spectrum (red boxes). 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

GRAV-D Aerogravity (07 June 2014) Gravity for the Redefinition of the American Vertical Datum Map Key - Airborne Gravity Data Green: Available data and metadata Blue: Data being processed Orange: Data collection underway White: Planned for data collection 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

GRAV-D Aerogravity Collection Aircraft: rotating between King Air, Pilatus, P-3 Equipment: GPS, IMU, & gravity meters Data sampling: 1 Hz Nominal Flight elevation: 6.1 km (20 kft) Nominal air speed: 407 kmh (220 knots) Track spacing: 10 km track (50 km crossovers) Typical block: 400 x 500 km (41 profiles) Nominal spectral band: km 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

EN06 – Collected over Maine EN06 Aerogravity (Beta vers.)Biases by Profile w.r.t. EGM June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

Profiles for 3 regions (no bias) Each profile is essentially independent Spatially correlated systematic features between profiles Likely error sources are in surface gravity: – Near shore (altimetry) – Onshore follows topo – Back bay areas 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

Zoom into Great lakes and NE (GPSBMs are too dense, will block maps) 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

Airborne vs. Surface Gravity Cleaning of gravity data Second transition band Remove biases w.r.t aerogravity (normalize) Makes surface data consistent with aerogravity Preserves short wavelength in surface 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

Impact of GRAV-D Aerogravity (xGEOID14B - xGEOID14A) 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014 Mean = 0.0 cm STDEV = 0.5 cm MIN = cm MAX = 34.6 cm

unitCnm_T (Ref) Cnm_Z00 (Ref+Airborn) Ref+Airborn+Surface No.AK.XGeoid14B cmstd #points Gulf Coast (240)482 PRVI (240) 10.25(480) 57 Great Lakes (240)2116 North East (240) 3.19(360) 3.04(480) 2.97(600) 168 (Altimetry problem ?) GSVS (240) 1.07(480) 218 CA11 (45N,36N,234W,241W) (240)581 Lake Michigan (47N,40N,270W,278W) (240)1777

Outlook 30 June 2014 Beta release of xGEOID14A/B Look for links on the NGS Main or GEOID pages Incorporates aerogravity from 20 regions First experimental model using aerogravity Annual releases to follow (roughly same time) Data cleaning: 2,000,000 surface gravity in 1400 different surveys Eventual usage as vertical datum in June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

Contact Information Daniel R. Roman, National Geodetic Survey Chief (acting) SRSD/GRAV-D P.I./Geoid Team Lead x103 Relevant NGS webpages: – Geoid Page: – GRAV-D: 17 June 2014, Session TS01A, Paper XXV FIG Congress, Kulala Lumpur, Malaysia June 2014

Gulf Coast 17 June 2014, Session TS01A, Paper 7303 XXV FIG Congress, Kulala Lumpur, Malaysia June

California 17 June 2014, Session TS01A, Paper 7303 XXV FIG Congress, Kulala Lumpur, Malaysia June

Great Lakes through Northeast U.S. 17 June 2014, Session TS01A, Paper 7303 XXV FIG Congress, Kulala Lumpur, Malaysia June

Puerto Rico & USVI 17 June 2014, Session TS01A, Paper 7303 XXV FIG Congress, Kulala Lumpur, Malaysia June