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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Tom, Thanks for the method you posted for finding a field value at a lat/lon. I tried it and it worked a treat! A function that returns a field value at a specific point would be very useful in diagnoses. Perhaps one could be included as part of one of the IDV Jython System libraries? Paul On 4 January 2013 02:26, Tom Whittaker <whittaker@xxxxxxxx> wrote: > Paul -- > > The simplest way to extract a value at a given lat/lon location might > be something like this (I'm assuming you're in the Jython Shell at > this point...): > > 1. a = selectData() > [then pick your gridded field -- if it's 3D then you'll > need to use the "make2D()" > function in the Jython library "Grid routines"] > > 2. assuming there is a "time" dimension, then do: > b = a[0] > > (if you do a "print len(a)" and the answer is a small number, like > "1", then you likely have a time dimension...you can also do "print > whatTypes(a)" and get the details of the structure of 'a') > > 3. then (welcome to the World of VisAD): > > from visad.georef import LatLonTuple > > 4. now for each point do this: > print b.evaluate( LatLonTuple( 43., -89.)) > > (using your own lat/lon values....) > > tom > > On Wed, Jan 2, 2013 at 11:45 PM, Paul Graham <meteorpaul@xxxxxxxxx> wrote: > > Hi Stuart, > > > > In hindsight, contours were not a good example of what I am wanting. > What I > > am wanting is to be able to interpolate gridded data sets, so I can put > in a > > lat/lon and obtain a field value, preferably using a Jython method. It > > would be good if IDV has a Jython method that could do this. > > > > Paul Graham > > > > -- > Tom Whittaker > University of Wisconsin-Madison > Space Science & Engineering Center (SSEC) > Cooperative Institute for Meteorological Satellite Studies (CIMSS) > 1225 W. Dayton Street > Madison, WI 53706 USA > ph: +1 608 262 2759 >
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