Using Aerogravity to Produce a Refined Vertical Datum

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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 7303. Gravity Field Power Spectrum. Power Spectrum plot of gravity field (blue line). Most power is at longest - PowerPoint PPT Presentation

Transcript of Using Aerogravity to Produce a Refined Vertical Datum

Using Aerogravity to Produce a Refined Vertical Datum

Using Aerogravity to Produce a Refined Vertical DatumD.R. Roman and X. Li

XXV FIG Congress16-21 June 2014 Kuala Lumpur, MalaysiaSession TS01A, Paper 73031Gravity Field Power Spectrum

Power Spectrum plot of gravity field (blue line). Most power is at longest wavelengths () 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 73032XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014GRAV-D Aerogravity (07 June 2014)Gravity for the Redefinition of the American Vertical Datum

Map Key - Airborne Gravity DataGreen: Available data and metadataBlue: Data being processedOrange: Data collection underwayWhite: Planned for data collectionhttp://www.ngs.noaa.gov/GRAV-D/data_products.shtml17 June 2014, Session TS01A, Paper 73033XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Roughly 35% complete see website for latest information3GRAV-D Aerogravity CollectionAircraft: rotating between King Air, Pilatus, P-3Equipment: GPS, IMU, & gravity metersData sampling: 1 HzNominal 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: 20-400 km17 June 2014, Session TS01A, Paper 73034XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014EN06 Collected over MaineEN06 Aerogravity (Beta vers.)Biases by Profile w.r.t. EGM2008

17 June 2014, Session TS01A, Paper 73035XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Profiles for 3 regions (no bias)

Each profile is essentially independentSpatially correlated systematic features between profilesLikely error sources are in surface gravity:Near shore (altimetry)Onshore follows topoBack bay areas17 June 2014, Session TS01A, Paper 73036XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Zoom into Great lakes and NE(GPSBMs are too dense, will block maps)

17 June 2014, Session TS01A, Paper 73037XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Airborne vs. Surface GravityCleaning of gravity dataSecond transition bandRemove biases w.r.t aerogravity (normalize)Makes surface data consistent with aerogravityPreserves short wavelength in surface

17 June 2014, Session TS01A, Paper 73038XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Impact of GRAV-D Aerogravity(xGEOID14B - xGEOID14A)17 June 2014, Session TS01A, Paper 73039XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014

Mean = 0.0 cm STDEV = 0.5 cm MIN = -42.8 cm MAX = 34.6 cmunitCnm_T(Ref)Cnm_Z00(Ref+Airborn)Ref+Airborn+SurfaceNo.AK.XGeoid14Bcmstdstdstd#pointsGulf Coast9.939.269.23(240)482PRVI11.7010.3710.49(240)10.25(480)57Great Lakes10.7210.6810.56(240)2116North East3.812.993.30(240)3.19(360)3.04(480)2.97(600)168 (Altimetry problem ?)GSVS111.861.081.37 (240)1.07(480)218CA11 (45N,36N,234W,241W)11.6411.2711.21(240)581Lake Michigan (47N,40N,270W,278W)

7.557.487.44(240)1777Outlook30 June 2014 Beta release of xGEOID14A/BLook for links on the NGS Main or GEOID pagesIncorporates aerogravity from 20 regionsFirst experimental model using aerogravityAnnual releases to follow (roughly same time)Data cleaning: 2,000,000 surface gravity in 1400 different surveysEventual usage as vertical datum in 202217 June 2014, Session TS01A, Paper 730311XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Contact InformationDaniel R. Roman, National Geodetic Survey Chief (acting) SRSD/GRAV-D P.I./Geoid Team [email protected] 301-713-3200 x103

Relevant NGS webpages:Geoid Page: http://www.ngs.noaa.gov/GEOID/GRAV-D: http://www.ngs.noaa.gov/GRAV-D/

17 June 2014, Session TS01A, Paper 730312XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 2014Gulf Coast

17 June 2014, Session TS01A, Paper 7303XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 201413California17 June 2014, Session TS01A, Paper 7303XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 201414

Great Lakes through Northeast U.S.

17 June 2014, Session TS01A, Paper 7303XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 201415Puerto Rico & USVI

17 June 2014, Session TS01A, Paper 7303XXV FIG Congress, Kulala Lumpur, Malaysia 16-21 June 201416

satellite models (GRACE/GOCE)450 200 56 28 20SHM deg. (km)Variance (m2)10+410+210 010-210-410-610-8air-surface transition bandsurface gravitysatellite-air transition bandairborne gravity


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Main characteristics: systematic global search algorithm of quasi-ballistic trajectories; Gravity assist (GA) and Aerogravity assist (AGA) manoeuvres;

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