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

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 10:54:48 2013