Re: [ferret_users] Gap in curvilinear fill plot

[guimond@xxxxxxxxxxxxx]

Hello Muyin:
 Thank you for your response.  After some tooling around, I got what I 
was looking for.  Originally, I tried adding the /modulo qualifier to 
my yaxis in order to span the gap in my plot, but the image I got was 
not pieced together properly (see attached "modulo.gif").  So taking 
your suggestion, I added a point in the yaxis and then regridded my 
lat,lons and variable to this new grid and got what I wanted (see 
attached "correct.gif").  I would have thought that adding /modulo and 
regridding to a grid with an extra point in y would have done the same 
thing, but it turns out the /modulo doesn't fit right.

Thanks again for your suggestion!

Steve


Quoting Muyin Wang <Muyin.Wang@noaa.gov>:

> Hi, Stephen:
> I found this problem when I plot NCEP's reanalysis data. The problem 
> is due to the grid of the data. For NCEP's data, the grid is 0-360 
> along the longitude, with 144 points. Since the grid box is defined 
> by the middle of the point, then there was a gap between 357.5 and 
> 360 when I use polar-projection in my plot. A easy way to fix this is 
> define another grid with ending point being 362.5, and regrid the 
> data to the new grid. You are not changing anything, but add an extra 
> point at the end to have an overlapping grid.
> Good luck!
> Muyin
>
> Stephen R. Guimond wrote:
>
> > Hello,
> >  I used the 3 arguement (curvilinear) fill command like so:
> >
> > fill speed,lon,lat  where speed,lon and lat are all two-dimensional 
> > arrays.  The corresponding plot produces a gap in the data (see 
> > attached image "fill_curvilinear.gif").  To check on this, I used 
> > the go polymark/polygon command to plot scattered data and found 
> > that no gap exists in the data (see attached image "polymark.gif").  
> > Any idea why the curvilinear version of fill is giving me this gap 
> > on my image?  Also, just wondering if anyone has seen my last e-mail 
> > entitled "Plotting wind data on cylindrical grid" ??
> >
> > Thanks Much,
> >
> > Steve
> >
> > =======================================================
> > Stephen R. Guimond
> > Graduate Research Assistant
> > Center for Ocean-Atmospheric Prediction Studies (COAPS)
> > Tallahassee, FL 32304
> > =======================================================
> >
> > ----------------------------------------------------------------
> >
> >
> > ------------------------------------------------------------------------
> >
> >
> > ------------------------------------------------------------------------


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Attachment: modulo.gif
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Attachment: correct.gif
Description: GIF image