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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Paul-There is no easy way/method. Even using Gridded3DSet is not simple because you would need to pass the grid domain through all the logic in the VisAD methods that compute an appropriate Gridded3DSet for the computation.
Don On 12/10/13 1:40 PM, Paul Graham wrote:
Hi Tom/Don, I had in mind to obtain the heights of the wet-bulb freezing level surface, which is why I was thinking it would be nice if there was an isosurface method that would return the heights of the surface. I think all one can do with folded areas is be content with a discontinuity in any 2d representation, though a discontinuity might not be the result of a fold. Paul On 11 December 2013 02:13, Don Murray (NOAA Affiliate) <don.murray@xxxxxxxx <mailto:don.murray@xxxxxxxx>> wrote: All- Gridded3DSet would return you a geometry in VisAD coordinates and you could then convert those to lat/lon/alt by running them through the MapProjectionDisplay's coordinate system (fromReference), I would presume. But tom's point is valid in that you can't always map an isosurface to a 2D surface. Even a "simple" field like temperature might have folds where there are inversions. Don On 12/10/13 8:08 AM, Tommy Jasmin wrote: On 12/10/13 8:52 AM, Tom Whittaker wrote: Paul -- I don't know of anything off-hand. One issue I see is if there is a fold in the isosurface, a 2D representation is impossible. For example, think of an isosurface of wind speed for, say, the 40kt isosurface -- they would be "tubes" and "bubbles"... tom On Mon, Dec 9, 2013 at 11:47 PM, Paul Graham <meteorpaul@xxxxxxxxx <mailto:meteorpaul@xxxxxxxxx>> wrote: Hi IDV'ers, I'm interested to know if there is a way to extract an isosurface from a 3d gridded field and store it as a 2d grid of isosurface heights for display or other purposes, using an IDV Jython script? Any help is appreciated. Thanks, Paul _________________________________________________ Hi guys - you are probably both aware but just to be sure, the VisAD Gridded3DSet class does have methods to extract both isosurfaces and isolines : http://www.ssec.wisc.edu/__visad-docs/javadoc/visad/__Gridded3DSet.html <http://www.ssec.wisc.edu/visad-docs/javadoc/visad/Gridded3DSet.html> -- Don Murray NOAA/ESRL/PSD and CU-CIRES 303-497-3596 http://www.esrl.noaa.gov/psd/__people/don.murray/ <http://www.esrl.noaa.gov/psd/people/don.murray/> _________________________________________________ idvusers mailing list idvusers@xxxxxxxxxxxxxxxx <mailto:idvusers@xxxxxxxxxxxxxxxx> For list information, to unsubscribe, visit: http://www.unidata.ucar.edu/__mailing_lists/ <http://www.unidata.ucar.edu/mailing_lists/> -- Paul Graham Email: meteorpaul@xxxxxxxxx <mailto:meteorpaul@xxxxxxxxx> Mobile: 0403003784
-- Don Murray NOAA/ESRL/PSD and CU-CIRES 303-497-3596 http://www.esrl.noaa.gov/psd/people/don.murray/
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