Re: obtain values of a single contour

From: <Mark.Collier_at_nyahnyahspammersnyahnyah>
Date: Mon Apr 15 2013 - 22:44:41 MDT

Hi Dave,
the interface looked simple enough but my best attempt gave:

fatal:NhlGetIsoLines: invalid contourplot id
fatal:NhlGetIsolines: error retrieving isolines
fatal:["Execute.c":8128]:Execute: Error occurred at or near line 251 in file plot_tropoh_climdiff.ncl

what I tried was:

plot0=gsn_csm_contour(wks,clim1_hist_ea,conres2)

isolines = get_isolines(plot0,(/2.0/))

where plot0 renders normally, and it contains the 2.0 contour level.

I'm using version 6.1.2

Thanks,
Mark.
________________________________________
From: David Brown [dbrown@ucar.edu]
Sent: Tuesday, 16 April 2013 4:01 AM
To: Collier, Mark (CMAR, Aspendale)
Cc: ncl-talk@ucar.edu
Subject: Re: obtain values of a single contour

Hi Mark,
I recently created a function that will do what you want. It is available in NCL 6.1.1 and later. Check out:

http://www.ncl.ucar.edu/Document/Functions/Built-in/get_isolines.shtml

 -dave

On Apr 15, 2013, at 12:41 AM, <Mark.Collier@csiro.au> wrote:

> Hi,
> I plot a single unique contour of a 2d array using @cnLevels = val using the gsn_csm_contour function.
>
> is there a way of obtaining the x-y values of that line from the plot?
>
> Regards,
> Mark.
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Received on Mon Apr 15 22:47:50 2013

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