Re: [ncarg-talk] Plotting across International Dateline

Dear Eowyn,

This question is more appropriate for ncl-talk than ncarg-talk, so I've CC'ed that group here.

You didn't indicate what kind of plotting you're doing (contours, polygons, polylines, vectors, etc),
and what you mean by "causes the whole globe to plot". Are you saying that you can't get
your map plot to be zoomed in on the area of interest, or is your data not being zoomed
in correctly?

If this is purely a map issue, then one fix might be to set mpCenterLonF to the center of the area
you want to look at (some value between 100E and 10W).

If this is more of a data issue, then it would help if you can provide the data as you suggested, an image showing the problem, and what variable you're trying to plot.

You can put the data on anonymous ftp:

ftp ftp.cgd.ucar.edu
<login as anonymous with your email address as the password>
cd pub
put ...your file...
quit

I will need to know the exact name of your file in order to retrieve it.

Thanks,

--Mary

On Apr 3, 2011, at 7:50 PM, Eowyn Connolly-Brown wrote:

> Hello NCL-users,
>
> I am encountering a problem identical to the one referenced in this
> thread from 2006:
> http://www.ncl.ucar.edu/Support/talk_archives/2006/0968.html
>
> trying to plot across the International Dateline and hoped it was now
> a solved problem. I've tried various approaches to reordering the
> data, among them: mpMin/MaxLonF resources, using lonFlip, lonPivot,
> and using the result for the 2006 thread. I'm trying to plot 100E to
> 10W, more than half the globe, which seems to be part of the problem,
> e.g. though the t variable has a longitude of 0..360, trying to plot
> 0..180+ degrees or 0..72+ indices causes the whole globe to plot. I'm
> not attaching code because my experimentations have been in
> interactive mode for the most part, but the summaries of the
> temperature and lon variables are below. I'd be grateful to know if
> there is an effective approach to this seemingly simple problem. I
> feel silly because I know I've done this before using CCSM output! I'd
> be happy to send a sample of my data (GFDL CM2 output) to interested
> parties.
>
> Thanks everyone!
>
> Eowyn Connolly
>
>
> Variable: t
> Type: float
> Total Size: 51840 bytes
> 12960 values
> Number of Dimensions: 3
> Dimensions and sizes: [time | 1] x [lat | 90] x [lon | 144]
> Coordinates:
> time: [87477.58333333333..87477.58333333333]
> lat: [-89.49438..89.49438]
> lon: [1.25..358.75]
> Number Of Attributes: 5
> long_name : surface temperature
> units : deg_k
> valid_range : ( 100, 400 )
> cell_methods : time: mean within months time: mean over years
> time_avg_info : average_T1,average_T2,average_DT
>
>
> Variable: lon
> Type: float
> Total Size: 576 bytes
> 144 values
> Number of Dimensions: 1
> Dimensions and sizes: [lon | 144]
> Coordinates:
> lon: [1.25..358.75]
> Number Of Attributes: 4
> long_name : longitude
> units : degrees_E
> cartesian_axis : X
> edges : lonb
> _______________________________________________
> ncarg-talk mailing list
> ncarg-talk@ucar.edu
> http://mailman.ucar.edu/mailman/listinfo/ncarg-talk

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Received on Mon Apr 4 15:39:46 2011