Re: Irregular grids in NCL

It looks like there may be an issue with your lat/lon arrays.

Did you verify that the values look okay?

  print(min(lat) + "/" + max(lat))
  print(min(lon) + "/" + max(lon))

Can you provide your new script and data files on our ftp site so I can try running it myself?

http://www.ncl.ucar.edu/known_bugs.shtml

 Thanks

--Mary

On Aug 22, 2012, at 3:57 AM, Szymon Jaranowski wrote:

> Dear Mary,
> I've commented the option; the result is very strange (attachment).
> Just like the coordinate systems of a map and data were completely
> different (the data is in geographic coordinates).
>
> --
> With best regards,
> Szymon Jaranowski
>
>
> On Tue, Aug 21, 2012 at 5:26 PM, Mary Haley <haley@ucar.edu> wrote:
>> Dear Szymon,
>>
>> In land_var.ncl, I noticed you are setting:
>>
>> res@tfDoNDCOverlay = True
>>
>> When you do this, you are effectively telling NCL that you've already set up the
>> map projection to exactly match the projection of your data, and hence it ignores
>> any settings of sfXArray and sfYArray.
>>
>> Try commenting this line out and rerunning your script.
>>
>> --Mary
>>
>> On Aug 21, 2012, at 6:06 AM, Szymon Jaranowski wrote:
>>
>>> I'm trying to draw a simple landmask using NCL.
>>>
>>> First on a regular grid - it works fine.
>>> Some images (attached):
>>>
>>> 1. Plot of grid's nodes (plot of geographic coordinates): grid_reg.png
>>> 2. Result: land_reg.png
>>> 3. NCL script: land_reg.ncl
>>>
>>> Then I'm doing the same on a second grid. The second grid covers the same area,
>>> but is more dense and irregular. Zoom of upper left corner:
>>>
>>> 4. Zoom of upper left corner: grid_var_zoom.png
>>>
>>> As seen on the image, nodes are irregularily spaced, but still this grid is
>>> a cartesian product of 1D grids. The effect:
>>>
>>> 5. Result: land_var.png
>>> 6. NCL script: land_var.ncl
>>>
>>> It seems sfXArray and sfYArray options are ignored - the data is plotted just
>>> like the spaces between the nodes where the same. Is it possible to draw plots
>>> on such grids in NCL?
>>>
>>> --
>>> With best regards,
>>> Szymon Jaranowski
>>> <grid_reg.png><grid_var_zoom.png><land_reg.ncl><land_reg.png><land_var.ncl><land_var.png>_______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
> <land_var_noverlay.png>

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Received on Wed Aug 22 07:54:16 2012