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 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
idvusers archives: