[ncl-talk] Fwd: contour plot misalignment

[Mary Haley]

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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