scholarly journals Biharmonic spline interpolation of GEOS-3 and SEASAT altimeter data

1987 ◽  
Vol 14 (2) ◽  
pp. 139-142 ◽  
Author(s):  
David T. Sandwell
Keyword(s):  
Spline Interpolation ◽  
Altimeter Data ◽  
Biharmonic Spline Interpolation

scholarly journals Road Tunnel Axial Fan Performance In Situ Test: Taking Qinling Zhongnan Mountain Highway Tunnel as an Example

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Yongdong Wang ◽  
Xingbo Han ◽  
Tianyue Zhou ◽  
Zhiwei He ◽  
Feilong Tian ◽  
...  
Keyword(s):  
Spline Interpolation ◽  
Road Tunnel ◽  
Axial Fan ◽  
In Situ Test ◽  
The Road ◽  
Highway Tunnel ◽  
Fitting Method ◽  
Axial Fans ◽  
Biharmonic Spline Interpolation

Axial fans play a pivotal role in the road tunnel ventilation system. Qualified performance of the axial fan is important for both safety and air quality maintenance reasons. Axial fans performance in situ test of Qinling Zhongnan Mountain highway tunnel, the second longest road tunnel in the world, is presented in this research. Performance test items and the qualification criterion, as well as a general framework for the road tunnel axial fan assessment, are recommended. Log-Tchebycheff method is suggested to confirm the location for the measuring lines and points. The precision of the log-Tchebycheff method in air flow rate measuring is verified by comparing with the biharmonic spline interpolation fitting result. The research shows that the log-Tchebycheff method has high precision and good efficiency in the air flow rate measurement of the road tunnel air duct. What is more, the biharmonic spline interpolation fitting method can be applied to obtain a more accurate result. The number of interpolation points of the biharmonic spline interpolation fitting method should be bigger than 2000 to provide quality results.

An Integrated Method for XRII Image Distortion Correction

2015 ◽  
Vol 742 ◽  
pp. 252-256 ◽  
Author(s):  
Yuan Jin Li ◽  
Hua Zhong Shu ◽  
Tao Wang ◽  
Yang Wang ◽  
You Yong Kong
Keyword(s):  
Imaging System ◽  
Spline Interpolation ◽  
Image Intensifier ◽  
Least Square Method ◽  
Integrated Approach ◽  
Distortion Correction ◽  
Least Square ◽  
Integrated Method ◽  
Negative Effect ◽  
Biharmonic Spline Interpolation

The distorted X-Ray Image Intensifier (XRII) image can introduce negative effect on following work for C-arm CT imaging system. In this paper, we propose an integrated approach based on least squares and Biharmonic spline interpolation to correct geometric distortions of XRII images. The method first uses morphology operation to extract the coordinate values of control points. Then the least square method fits the extracted coordinate values in every row and computes the more coordinate values by fixing the length in every row. Finally, The Biharmonic spline interpolation is used to interpolate the all coordinate values and correct the distortional XRII image. The experiment shows that the integrated method can effectively correct the distorted XRII image.

scholarly journals Pseudo 3D seismic using biharmonic spline interpolation

2020 ◽  
Vol 481 ◽  
pp. 012054
Author(s):  
E Yulianto ◽  
F Abdullah ◽  
N Novrizal ◽  
A Riyanto
Keyword(s):  
Spline Interpolation ◽  
3D Seismic ◽  
Biharmonic Spline Interpolation

scholarly journals Estimating Smoothly Varying Open Boundary Conditions for a 3D Internal Tidal Model with an Improved Independent Point Scheme

2018 ◽  
Vol 35 (6) ◽  
pp. 1299-1311 ◽  
Author(s):  
Dong Jiang ◽  
Haibo Chen ◽  
Guangzhen Jin ◽  
Xianqing Lv
Keyword(s):  
Boundary Conditions ◽  
Adjoint Method ◽  
Spline Interpolation ◽  
Northern South China Sea ◽  
Altimeter Data ◽  
Open Boundary ◽  
Open Boundary Conditions ◽  
Independent Point ◽  
Tidal Model ◽  
Point Scheme

AbstractAn improved independent point (IP) scheme was proposed to estimate the open boundary conditions (OBCs) for a 3D internal tidal model through assimilating the TOPEX/Poseidon (T/P) altimeter data. Under the assumption that the OBCs were spatially and smoothly varying, values at a set of independent points along the open boundary were inverted using the adjoint method and values at other points were interpolated by the spline method. The scheme was calibrated through idealized experiments where the M2 tidal constituent in the northern South China Sea was simulated. The OBCs can be successfully inverted with the improved scheme and were better in spatial smoothness than the results obtained with the Cressman interpolation when embedded in the IP scheme. Simulations in realistic domains showed that the errors between simulations and observations were smaller when the spline interpolation was employed instead of the Cressman interpolation. Three boundary conditions of spline interpolation were used in simulations in realistic domains, and the result of the periodic boundary condition had the smallest error compared with the first and second boundary conditions.

Use of Biharmonic Spline Interpolation for Decreasing the Errors of Smart Sensors

2014 ◽  
Vol 57 (9) ◽  
pp. 997-1003
Author(s):  
E. M. Belozubov ◽  
V. A. Vasil’ev ◽  
P. S. Chernov
Keyword(s):  
Spline Interpolation ◽  
Smart Sensors ◽  
Biharmonic Spline Interpolation

scholarly journals Inversion of Tidal Open Boundary Conditions of the M2 Constituent in the Bohai and Yellow Seas

2017 ◽  
Vol 34 (8) ◽  
pp. 1661-1672 ◽  
Author(s):  
Haidong Pan ◽  
Zheng Guo ◽  
Xianqing Lv
Keyword(s):  
Boundary Conditions ◽  
Adjoint Method ◽  
Spline Interpolation ◽  
Altimeter Data ◽  
Open Boundary ◽  
Open Boundary Conditions ◽  
Tidal Constituent ◽  
Spatially Varying

AbstractOpen boundary conditions (OBCs) of the M2 tidal constituent in the Bohai and Yellow Seas (BYS) were inverted successfully through assimilation of TOPEX/Poseidon (T/P) altimeter data. An improved independent points (IPs) scheme was employed in the inversion. Under the assumption that the OBC was spatially varying, values at a set of IPs along the open boundary were inverted using the adjoint method and those at other points were calculated by the spline interpolation. The OBC inverted with the improved scheme was closer to reality in terms of smoothness than that inverted with the Cressman interpolation. The scheme was calibrated in twin experiments. Practical experiments showed that the misfits between simulated results and observations were smaller when the spline interpolation was used.

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