[ncl-talk] Error in selecting box using coordinate subscripting

[Adam Phillips]

Rashed is right, lonPivot is definitely one way to get around this issue.
Another possibility is to just specify the area like this:
temp_et = temp({30:60},{-240:-170})
Hope that helps!
Adam

On Fri, Jul 16, 2021 at 11:46 AM Rashed Mahmood via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> lonFlip assumes that the central longitude is either Greenwich meridian
> (0) or 180 which is not the case in your data. Maybe "lonPivot" could do
> the job?
> https://www.ncl.ucar.edu/Document/Functions/Contributed/lonPivot.shtml
>
> Or regriding the data could be another option.
>
>
>
>
>
> On Fri, Jul 16, 2021 at 8:55 AM samirpokhrel via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Dear NCL Users,
>>
>>
>> I am having problem while selecting a specific region within model output
>> global data. Model data Longitudes varies from -279.75 to 79.75. The
>> printVarSummary of the model data is as follows
>>
>> -------
>>
>> Variable: temp
>>
>> Type: double
>>
>> Number of Dimensions: 2
>>
>> Dimensions and sizes: [YT_OCEAN | 410] x [XT_OCEAN | 720]
>>
>> Coordinates:
>>
>> YT_OCEAN: [-80.75..89.75]
>>
>> XT_OCEAN: [-279.75..79.75]
>>
>> ---------
>>
>> When I am trying to Select the region 120 E to 170W and 30N to 60N by
>> using coordinate subscripting viz.
>>
>>
>> temp_et = temp({30:60},{120:-170})
>>
>>
>> It is giving error like
>>
>>
>> fatal:NclOneDValGetRangeIndex: start coordinate index out of range, can't
>> continue
>>
>> fatal:Could not obtain coordinate indexes, unable to perform subscript
>>
>>
>> Thereafter I have performed the lonFlip function
>>
>>
>> temp_new = lonFlip(temp)
>>
>> temp_et = temp_new({30:60},{120:-170})
>>
>>
>> and the error is solved and the printVarSummary now looks like
>>
>>
>> ---------------------------
>>
>> Variable: temp_et
>>
>> Type: double
>>
>> Number of Dimensions: 2
>>
>> Dimensions and sizes: [YT_OCEAN | 40] x [XT_OCEAN | 440]
>>
>> Coordinates:
>>
>> YT_OCEAN: [30.2501..59.75]
>>
>> XT_OCEAN: [119.75..-99.75]
>>
>> ----------------------------
>>
>>
>> This is incorrect as my data is 0.5 degree resolution and X dimension
>> should be 140 size rather than 440 size
>>
>>
>> Please let me know where I am going wrong
>>
>>
>> Thanking you in advance
>>
>>
>> Regards
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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