Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Hi Yuzhong, > I'm using VisAD to visualize some ocean data. I'd like to know whether > VisAD has classes for streamline and streakline generation? Thank you > very much for your help. No, there are no classes for this. VisAD regards streamlines and streaklines as analyses rather than built into the display logic. It would be possible to write a pretty general method streamline whose input was a wind field with MathType: ((x, y, z) -> (u, v, w)) and whose output was a field with MathType: (index -> Set(x, y, z)) where each Set has manifold dimension = 1 (i.e., a streamline through space). The lines could even include little arrows. Map files are already represented as Set(x, y) with manifold dimension = 1. See examples/Rivers.java for a simple example. It would be useful to check for Units in x, y, z, u, v, w to draw accurate streamlines, and also to check for any CoordinateSystem from (x, y, z) to reference (Latitude, Longitude, Altitude). For streaklines, the input Field would probably have MathType: (time -> ((x, y, z) -> (u, v, w))) and the logic would be a bit more complex. Cheers, Bill ---------------------------------------------------------- Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706 hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738 http://www.ssec.wisc.edu/~billh/vis.html
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