Isosurfaces

Isosurfaces

 

in geophysics, surfaces that can be passed through points having identical values for some particular geophysical quantity in the atmosphere, hydrosphere, or lithosphere. Isosurfaces give a clear picture of the spatial distribution of such geophysical quantities as pressure (isobaric surfaces), temperature, density (of air or water), gravitational potential, and potential of the electric or magnetic field.

References in periodicals archive ?
1 and 2 in terms of their electron density isosurfaces at a fixed value of 0.002 electron * [au.sup.-3], where 1 au is the Bohr radius of hydrogen.
This robust, yet easy-to-use, program gives the user the power to display data in a variety of colors, views, and 3D formats: 3D rendered volumes, Isosurfaces, straight and deviated well bores, 3D block models, contours, 3D slices, orthographic and oblique images, scatter plots, stream lines, and vector plots.
Since our decomposition method preserves the topology of all the isosurfaces inside a cube, adopting our method instead of the 5-fold or 6-fold decomposition generates a topologically correct interval volume.
Some specific topics explored include certified meshing of families of isosurfaces, automatic generation of bas-reliefs from 3D shapes, deforming surface simplification based on dynamic geometry sampling, and topological correction of hypertextured implicit surfaces for ray casting.
Thus, graphical performance becomes an issue, particularly when the visualizations include objects like isosurfaces containing tens or hundreds of thousands of polygons.
Some of the more common volume visualization concepts that are used to understand unseen behavior include isosurfaces, volume slicing, vector and tensor quantities, and gradient display.
The radar echo top, which was defined here as the maximum height of 15-dBZ isosurfaces, remained at about 10 km AGL during the entire life cycle of the supercell except for at around 1450 LST, when the radar echo top reached approximately 12.3 km AGL with an overshooting cloud top first clearly detected in high-resolution satellite images.
[5] proposed an effective mesh smoothing algorithm which preserves morphology on polygonized isosurfaces of inhomogeneous binary volumes.
Figures 12 and 13 show time-averaged isosurfaces of the total pressure coefficient with values less than or equal to zero for these two cases.
Caption: Figure 15: Instantaneous isosurfaces of second invariant of velocity tensor gradient (q/[([U.sub.[infinity]]/L).sup.2] = 20) for cavity flows without acoustic resonance (D/L = 0.5).
Topics include (for example) multi-finger cursor techniques, realistic and interactive simulation of rivers, compression of time varying isosurfaces, and image synthesis using adjoint photons.
Currently available commercial and open source visualization software has so far been incapable of processing these snapshots, mostly due to internal array indexing limitations and memory addressing issues, especially while computing isosurfaces. Also, interactive display of full resolution rendered images of the dendrites from simulations on grids of [300.sup.3] or larger has been too slow for practical use.