[ncl-talk] Fwd: contour plot misalignment

[Mary Haley]

Marston,

To be clear, I don't think you should set tfDoNDCOverlay at all!  I was
asking if you were doing this, because that's what could make your plot
wrong.

I don't think you should need to regrid the data to plot it, either.  You
really should be able to plot the observational values as they are.

It's hard for us to debug a problem if we can't see your script. If you can
send this, then I might have a better idea of what's going on. It also
helps if you can provide the data.

--Mary


On Thu, Jan 26, 2017 at 9:48 AM, GMAIL <shejo284 at gmail.com> wrote:

> Hi Mary,
>
> I’m still working on this. I’ve not set the tfDoNDCOverlay and what I
> realised is that my model doesn’t have a square grid, i.e., the
> spacing in the lat and lon directions are slightly different.
> I’m regridding instead to a square grid and then binning the MHS data to
> the square grid. If this fails I’ll plot the lat and lon values as you
> suggested and contact you again with more information for some help.
> Appreciate the tip :-)
>
> /M
>
> On 26 Jan 2017, 06:18 +0100, Mary Haley <haley at ucar.edu>, wrote:
>
> Marston,
>
> There could be a few things going on here.
>
> One is simply that your lat/lon values are not quite correct.
>
> Are you setting tfDoNDCOverlay to True by any chance? If you are trying to
> use a native projection and you don't have the native projection parameters
> set exactly right, then the plot can be slightly misaligned.
>
> One thing I would suggest is plotting the observational lat/lon values as
> markers on your second plot to see if they are also misaligned with the
> coastlines. You should be able to use gsn_add_polymarker to plot the
> markers.
>
> Finally, as usual, if you can provide the data for the observational plot,
> and a script, then I can take a look.
>
> --Mary
>
>
> On Wed, Jan 25, 2017 at 3:17 AM, Marston Johnston <marston.johnston at gu.se>
> wrote:
>
>> Hi,
>>
>> I’ve binned (bin_sum) some MHS data to a model grid using rational lats
>> and lons values (see linked fig
>> <https://www.dropbox.com/s/fi6s577iio47u4w/mhs_t511_si_contour.pdf?dl=0>
>> ).
>> The upper panel in the figure is the model data but the bottom figure is
>> from the observations. As you can see the
>> coastlines are slightly off and I cannot figure out why. Does anyone have
>> any idea why this is happening to the bin_sum figure?
>> I’ve used the same set of lats and lons consistently throughout the
>> process.
>>
>> Any hint/help is appreciated.
>>
>> /M
>>
>> Marston S. Johnston, PhD
>> Department of Earth Sciences
>> University of Gothenburg, Sweden
>> Email: marston.johnston at gu.se
>> SkypeID: marston.johnston
>> Phone: +46-31-7864901 <+46%2031%20786%2049%2001>
>> Only the fruitful thing is true!
>>
>>
>>
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