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Hi Don, After some further thought, perhaps I am not taking the best approach. Even if one is content with folds rendered as discontinuities on a 2d grid, any mapping algorithm will still have to decide which part of the fold to ignore. Thanks again for your help, Paul On 11 December 2013 07:51, Don Murray (NOAA Affiliate) <don.murray@xxxxxxxx>wrote: > 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/ > -- Paul Graham Email: meteorpaul@xxxxxxxxx Mobile: 0403003784
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