Re: [idvusers] Jython method to extract isosurface?

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>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>
>>> 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
>>
>>
> --
> Don Murray
> NOAA/ESRL/PSD and CU-CIRES
> 303-497-3596
> http://www.esrl.noaa.gov/psd/people/don.murray/
>
>
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-- 
Paul Graham
Email: meteorpaul@xxxxxxxxx
Mobile: 0403003784