1
|
Regional Seafloor Topography by Extended Kalman Filtering of Marine Gravity Data without Ship-Track Information. REMOTE SENSING 2021. [DOI: 10.3390/rs14010169] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An iterative Extended Kalman Filter (EKF) approach is proposed to recover a regional set of topographic heights composing an undersea volcanic mount by the successive combination of large numbers of gravity measurements at sea surface using altimetry satellite-derived grids and taking the error uncertainties into account. The integration of the non-linear Newtonian operators versus the radial and angular distances (and its first derivatives) enables the estimation process to accelerate and requires only few iterations, instead of summing Legendre polynomial series or using noise-degraded 2D-FFT decomposition. To show the effectiveness of the EKF approach, we apply it to the real case of the bathymetry around the Great Meteor seamount in the Atlantic Ocean by combining only geoid height/free-air anomaly datasets and using ship-track soundings as reference for validation. Topography of the Great Meteor seamounts structures are well-reconstructed, especially when regional compensation is considered. Best solution gives a RMS equal to 400 m with respect to the single beam depth observations and it is comparable to RMS obtained for ETOPO1 of about 365 m. Larger discrepancies are located in the seamount flanks due to missing high-resolution information for gradients. This approach can improve the knowledge of seafloor topography in regions where few echo-sounder measurements are available.
Collapse
|
2
|
Shipboard Confirmation of Seasat Bathymetric Predictions in the South Central Pacific. ACTA ACUST UNITED AC 2013. [DOI: 10.1029/gm043p0115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
3
|
|
4
|
Vogt PR, Zondek B, Fell PW, Cherkis NZ, Perry RK. Seasat altimetry, the North Atlantic geoid, and evaluation by shipborne subsatellite profiles. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jb089ib12p09885] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
5
|
Smith WHF, Sandwell DT. Bathymetric prediction from dense satellite altimetry and sparse shipboard bathymetry. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/94jb00988] [Citation(s) in RCA: 345] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
6
|
Thompson JD. Altimeter data and geoid error in mesoscale ocean prediction: Some results from a primitive equation model. ACTA ACUST UNITED AC 1986. [DOI: 10.1029/jc091ic02p02401] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
7
|
|
8
|
Sailor RV, Okal EA. Applications of SEASAT altimeter data in seismotectonic studies of the south-central PACIFIC. ACTA ACUST UNITED AC 1983. [DOI: 10.1029/jc088ic03p01572] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|