Partial Spline Models for the Inclusion of Tropopause and Frontal Boundary Information in Otherwise Smooth Two- and Three-Dimensional Objective Analysis

1986 ◽  
Vol 3 (4) ◽  
pp. 714-725 ◽  
Author(s):  
Jyh-Jen Shiau ◽  
Grace Wahba ◽  
Donald R. Johnson
Keyword(s):  
Three Dimensional ◽  
Objective Analysis ◽  
Spline Models ◽  
Boundary Information ◽  
Frontal Boundary

Experiments with a Three-Dimensional Statistical Objective Analysis Scheme Using FGGE Data

1987 ◽  
Vol 115 (1) ◽  
pp. 272-296 ◽  
Author(s):  
Wayman E. Baker ◽  
Stephen C. Bloom ◽  
John S. Woollen ◽  
Mark S. Nestler ◽  
Eugenia Brin ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Objective Analysis ◽  
Analysis Scheme

scholarly journals An experiment in three-dimensional objective analysis

Tellus ◽  
1963 ◽  
Vol 15 (4) ◽  
pp. 432-438 ◽  
Author(s):  
G. A. Corby
Keyword(s):  
Three Dimensional ◽  
Objective Analysis

scholarly journals Interaction of an Upper-Tropospheric Jet with a Squall Line Originating along a Cold Frontal Boundary

2016 ◽  
Vol 144 (11) ◽  
pp. 4197-4219
Author(s):  
Daniel M. Stechman ◽  
Robert M. Rauber ◽  
Greg M. McFarquhar ◽  
Brian F. Jewett ◽  
David P. Jorgensen
Keyword(s):  
Three Dimensional ◽  
Squall Line ◽  
Naval Research ◽  
Jet Stream ◽  
Bow Echo ◽  
Mesoscale Convective ◽  
Parent Domain ◽  
Mesoscale Convective Vortex ◽  
Doppler Analysis ◽  
Frontal Boundary

Abstract On 8 June 2003, an expansive squall line along a surface cold frontal boundary was sampled during the Bow Echo and Mesoscale Convective Vortex Experiment. The Naval Research Laboratory P-3 aircraft and the National Oceanic and Atmospheric Administration P-3 aircraft simultaneously sampled the leading and trailing edge of this squall line, respectively, with X-band Doppler radars. Data from these two airborne radar systems have been synthesized to produce a pseudo-quad-Doppler analysis of the squall line, yielding a detailed three-dimensional kinematic analysis of its structure. A simulation of the squall line was carried out using the Weather Research and Forecasting Model to complement the pseudo-quad-Doppler analysis. The simulation employed a 3-km, convection-allowing, nested domain centered over the pseudo-quad-Doppler domain, along with a 9-km parent domain to capture the larger synoptic-scale cyclone. The pseudo-quad-Doppler analysis reveals that the convective line was embedded within the upper-tropospheric jet stream, causing local decelerations and deviations in the jet-level flow. The vertical transport of low momentum air from the boundary layer via convective updrafts is shown to significantly decelerate jet-level flow. Pressure perturbations associated with the intrusion of low momentum air into the jet stream–level flow led to deviation of the jet stream flow around the squall line that resulted in counter-rotating ribbons of vertical vorticity parallel to the squall line. Model results indicate that disturbances in the jet stream structure persisted downwind of the squall line for several hours.

CONSTRUCTION OF ANATOMICALLY ACCURATE FINITE ELEMENT MODELS OF THE HUMAN HAND AND A RAT KIDNEY

2011 ◽  
Vol 11 (05) ◽  
pp. 1141-1164 ◽  
Author(s):  
LI ZHONG MU ◽  
HONG WEI SHAO ◽  
YING HE ◽  
TOSHIAKI ODA ◽  
XUE MEI JIA
Keyword(s):  
Image Processing ◽  
Finite Element ◽  
Rat Kidney ◽  
Three Dimensional ◽  
3D Models ◽  
Human Hand ◽  
Finite Element Models ◽  
Transfinite Interpolation ◽  
Boundary Information ◽  
Magnetic Resonance Imaging Mri

The aim of the paper is to develop a method for generating three-dimensional (3D) models of organs from medical images (computerized tomography (CT) images, magnetic resonance imaging (MRI), etc.). There were three main steps in the development of the model: the first step was image processing. Different image-processing operators including blurring, sharpening, edge detection, region segmentation, mathematical morphology transformation, rotation, and movement of the kidney slices were performed to automatically construct the accurate boundary information. The second step was mesh generation of each slice based on the boundary information by using the transfinite interpolation (TFI) technique. In this paper, the TFI method was improved to create grids from images directly. The last step was reconstructing the models by stacking the 2D grid models and visualizing the result in the Advanced Visual System (AVS) software. In order to verify the effectiveness of this method, the finite element (FE) models of a rat kidney, human hand, and blood vessels were reconstructed and good results were obtained.

scholarly journals Multipass Objective Analyses of Doppler Radar Data

2008 ◽  
Vol 25 (10) ◽  
pp. 1845-1858 ◽  
Author(s):  
Mario Majcen ◽  
Paul Markowski ◽  
Yvette Richardson ◽  
David Dowell ◽  
Joshua Wurman
Keyword(s):  
Radial Velocity ◽  
Computational Cost ◽  
Three Dimensional ◽  
Radar Data ◽  
Objective Analysis ◽  
Small Scale ◽  
Velocity Data ◽  
Wind Fields ◽  
Single Pass ◽  
Radial Velocity Data

Abstract This note assesses the improvements in dual-Doppler wind syntheses by employing a multipass Barnes objective analysis in the interpolation of radial velocities to a Cartesian grid, as opposed to a more typical single-pass Barnes objective analysis. Steeper response functions can be obtained by multipass objective analyses; that is, multipass objective analyses are less damping at well-resolved wavelengths (e.g., 8–20Δ, where Δ is the data spacing) than single-pass objective analyses, while still suppressing small-scale (<4Δ) noise. Synthetic dual-Doppler data were generated from a three-dimensional numerical simulation of a supercell thunderstorm in a way that emulates the data collection by two mobile radars. The synthetic radial velocity data from a pair of simulated radars were objectively analyzed to a grid, after which the three-dimensional wind field was retrieved by iteratively computing the horizontal divergence and integrating the anelastic mass continuity equation. Experiments with two passes and three passes of the Barnes filter were performed, in addition to a single-pass objective analysis. Comparison of the analyzed three-dimensional wind fields to the model wind fields suggests that multipass objective analysis of radial velocity data prior to dual-Doppler wind synthesis is probably worth the added computational cost. The improvements in the wind syntheses derived from multipass objective analyses are even more apparent for higher-order fields such as vorticity and divergence, and for trajectory calculations and pressure/buoyancy retrievals.

scholarly journals Application of 3D Dynamic Image Technology in Industrial Products

2021 ◽  
Vol 2074 (1) ◽  
pp. 012062
Author(s):  
Changyong Zhu ◽  
Xiaodong Zheng ◽  
Chao Zhou
Keyword(s):  
Three Dimensional ◽  
Experimental Tests ◽  
Dynamic Imaging ◽  
Test Accuracy ◽  
Contour Tracking ◽  
Industrial Products ◽  
Chain Code ◽  
Code Table ◽  
Boundary Information ◽  
Manual Testing

Abstract Aiming at the problems of manual testing of industrial products, a measurement method of industrial products based on three-dimensional dynamic imaging technology is proposed. The products on the production line are dynamically photographed from different angles and within a certain period of time by using cameras. Then the obtained Image denoising processing and contour tracking based on chain code table and line segment table to obtain boundary information and regional information of each enclosed area of the image. Experimental tests show that the test accuracy of this method is 100%, which is suitable for real-time detection. Fully automated research on product testing provides the foundation.

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