Journal
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/ijgi10100667
Keywords
ocean current; flow visualization; streamlet; particle system; dynamic visualization
Funding
- National Natural Science Foundation of China [62071279, 41930535]
- SDUST Research Fund [2019TDJH103]
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This paper proposed a new dynamic visualization method of multi-hierarchy flow field in a 3D digital Earth environment, studied different algorithms and eliminated the density change of streamlines by using a specific seed point distribution method. Additionally, a viewport-adaptive adjustment algorithm was introduced to ensure particle density is suitable for different viewing distances, addressing the deficiency in visual representation of ocean currents.
In three-dimensional (3D) digital Earth environment, there are many problems when using the existing methods to express the ocean current, such as uneven distribution of seed points, density leap in scale change and messy visualization. In this paper, a new dynamic visualization method of multi-hierarchy flow field based on particle system is proposed; Specifically, three typical spherical uniform algorithms are studied and compared, and the streamline becoming denser from the equator to the poles on globe is eliminated by placing seed points using Marsaglia polar method as the most efficient. In addition, a viewport-adaptive adjustment algorithm is proposed, which realizes that the density of particles is always suitable to any viewing distance during continuous zooming. To solve the visual representation deficiency, we design a new dynamic pattern to enhance the expression and perception of current, which makes up for the shortcoming of the arrow glyph and streamline methods. Finally, a prototype of GPU parallel and viewport coherence is achieved, whose feasibility and effectiveness are verified by a series of experiments. The results show that our method can not only represent ocean current data clearly and efficiently, but also has outstanding uniformity and hierarchy effect.
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