A Spherical Volume-Rendering Method of Ocean Scalar Data Based on Adaptive Ray Casting

There are some limitations in traditional ocean scalar field visualization methods, such as inaccurate expression and low efficiency in the three-dimensional digital Earth environment. This paper presents a spherical volume-rendering method based on adaptive ray casting to express ocean scalar field...

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Bibliographic Details
Published in:ISPRS international journal of geo-information 2023-04, Vol.12 (4), p.153
Main Authors: Li, Weijie, Liang, Changxia, Yang, Fan, Ai, Bo, Shi, Qingtong, Lv, Guannan
Format: Article
Language:English
Subjects:
Adaptive algorithms
adaptive ray casting
Adaptive sampling
Algorithms
Climate change
Colour
Coordinate transformations
Datasets
Earth environment
Efficiency
Geometry
Interpolation
Methods
nonlinear color mapping
Ocean floor
ocean scalar field
Ray tracing
Rendering
Research methodology
Sampling
Scalars
Skewness
structure extraction
Terrain
terrain fusion method
Transfer functions
transparency transfer function
Video compression
Visualization
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Summary:There are some limitations in traditional ocean scalar field visualization methods, such as inaccurate expression and low efficiency in the three-dimensional digital Earth environment. This paper presents a spherical volume-rendering method based on adaptive ray casting to express ocean scalar field. Specifically, the minimum bounding volume based on spherical mosaic is constructed as the proxy geometry, and the depth texture of the seabed terrain is applied to determine the position of sampling points in the spatial interpolation process, which realizes the fusion of ocean scalar field and seabed terrain. Then, we propose an adaptive sampling step algorithm according to the heterogeneous depth distribution and data change rate of the ocean scalar field dataset to improve the efficiency of the ray-casting algorithm. In addition, this paper proposes a nonlinear color-mapping enhancement scheme based on the skewness characteristics of the datasets to optimize the expression effect of volume rendering, and the transparency transfer function is designed to realize volume rendering and local feature structure extraction of ocean scalar field data in the study area.
ISSN:2220-9964
2220-9964
DOI:10.3390/ijgi12040153