Re: GCM output on i,j grid instead of lat,lon

Aah yes - silly me.
Thanks a lot, Mary!
MB

> To remove the X and Y axis titles:
>
> res@tiXAxisString = ""
> res@tiYAxiStrig = ""
>
> The gsnLeft/Right/CenterString resources are for the subtitles that appear
> on the top of the plot.
>
> --Mary
>
> On Jun 3, 2013, at 10:41 AM, Mira Berdahl wrote:
>
>> Hi Mary,
>>
>> Thanks very much for your reply. As it turns out, I have used the CICE
>> Tripole Grid example (last example here:
>> http://www.ncl.ucar.edu/Applications/ice.shtml) which seems to do the
>> trick for correctly plotting with the irregular ocean grid in the BNU
>> model. But just to answer your question, there is no additional
>> attribute
>> called "coordinates" in the file. I had to use the t-grid cell area file
>> from the model output to get TLAT and TLON.
>>
>> However, now I am running into an issue where the x and y axes of my
>> plot
>> are automatically labeled as "cell index along first dimension" and
>> "cell
>> index along second dimension". Is it possible to suppress these labels?
>> I have tried with the following but it doesn't do the trick:
>> res@gsnLeftString = "" ; suppress automatic labels
>> res@gsnRightString = ""
>>
>> Thanks very much to anyone who can help out.
>> Best,
>> Mira
>>
>>> Mira,
>>>
>>> It looks like the BNU model might have its data on a curvilinear grid.
>>>
>>> That is, the grid is defined by 2D lat/lon arrays, rather than by
>>> 1D lat/lon arrays (rectilinear). For curvlinear variables, you won't
>>> have the lat/lon arrays attached as coordinate arrays. You will
>>> have to read them in separately.
>>>
>>> Sometimes there's an additional attribute called "coordinates" attached
>>> to your variable that tells you what the name of the lat/lon variables
>>> are
>>> on the file.
>>>
>>> For example:
>>>
>>> float TEMP ( time, z_t, nlat, nlon )
>>> long_name : Potential Temperature
>>> units : degC
>>> coordinates : TLONG TLAT z_t time <-------
>>> cell_methods : time: mean
>>> _FillValue : 9.96921e+36
>>> missing_value : 9.96921e+36
>>>
>>> The above information tells me to look for TLONG and TLAT variables on
>>> the
>>> file.
>>>
>>> Does the "sicBNU_6070_rcp45" variable have any other attribute
>>> information other than what you included below? If so, look for
>>> an attribute called "coordinates", which then might give you
>>> the name of the lat/lon variables on the file to use.
>>>
>>> If this doesn't help, then can you provide us with a sample file?
>>>
>>> http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP
>>>
>>> Thanks,
>>>
>>> --Mary
>>>
>>>
>>> On Jun 1, 2013, at 10:34 AM, Mira Berdahl wrote:
>>>
>>>> Hi everyone,
>>>>
>>>> I am experiencing a problem when plotting sea ice extent as a
>>>> spaghetti
>>>> plot from one of the CMIP5 output models. It seems that the BNU model
>>>> is
>>>> on an i,j grid whereas all other models (that I have used at least)
>>>> are
>>>> on
>>>> a lat,lon grid.
>>>>
>>>> So when I printVarSummary for the BNU variable I am trying to plot I
>>>> get:
>>>> Variable: sicBNU_6070_rcp45
>>>> Type: float
>>>> Total Size: 144000 bytes
>>>> 36000 values
>>>> Number of Dimensions: 2
>>>> Dimensions and sizes: [j | 100] x [i | 360]
>>>> Coordinates:
>>>> j: [101..200]
>>>> i: [1..360]
>>>> Number Of Attributes: 11
>>>> standard_name : sea_ice_area_fraction
>>>> long_name : Sea Ice Area Fraction
>>>> comment : fraction of grid cell covered by sea ice.
>>>>
>>>>
>>>>
>>>>
>>>> Whereas for the other models I get something like:
>>>>
>>>> Variable: sicMIROC_CHEM_6070_rcp45
>>>> Type: float
>>>> Total Size: 98304 bytes
>>>> 24576 values
>>>> Number of Dimensions: 2
>>>> Dimensions and sizes: [lat | 96] x [lon | 256]
>>>> Coordinates:
>>>> lat: [0.2790889739990234..89.14443969726562]
>>>> lon: [0.703125..359.296875]
>>>> Number Of Attributes: 11
>>>> standard_name : sea_ice_area_fraction
>>>> long_name : Sea Ice Area Fraction
>>>> comment : fraction of grid cell covered by sea ice.
>>>>
>>>>
>>>> When I try to make the spaghetti plot, it runs but gives a very wrong
>>>> looking result for the BNU model. The other models look good. I should
>>>> mention that the BNU output does indeed have lat and lon but as
>>>> separate
>>>> variables. When I use ncview to look at the BNU data it looks fine,
>>>> but
>>>> I
>>>> am assuming NCL is having problems since its dimensions are not
>>>> lat,lon.
>>>> Is that right? Does anyone see a good way to work around this?
>>>>
>>>> Thanks in advance for any help or suggestions!
>>>> MB
>>>>
>>>>
>>>>
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>>>
>>>
>
>

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Received on Mon Jun 3 11:19:30 2013