Re: Extra Points on Contour Maps

Hi Mary,

I did have RasterSmoothing set to True, with no luck at the time.

I ran my script again to see which data files were doing this
(unchanged), and everything seemed to plot properly. I am not sure what
is going on here. I did make the debug stuff you requested (attached).
This was one of the problematic files.

When I plot the small area with CellFill, only four whole cells are on
the plot. There are 12 partial cells along the edges of the plots.

Thanks!

-Josh

On 05/13/2010 09:59 AM, Mary Haley wrote:
> Josh,
>
> I need more information about your data. When you say 4x4 degrees, exactly
> how big of an array is this area? If you are zooming in on area that is only contained by
> one cell, I don't think you can contour this.
>
> There may be something else going on with it that's causing the blank plot.
> For example, if you are zooming in on an area that is contained between two
> contour levels, you may get the blank plot. This is something I created a ticket
> for, as it seems like a bug.
>
> However, this problem is supposed to go away when you use raster fill
> and set res@cnRasterSmoothingOn = True. Have you tried this?
>
> If you are able to provide us with script and data, then here's
> one way to do this:
>
> - Set res@gsnDebugWriteFileName = "mary"
> - Run your script
> - This should create "mary.ncl" and "mary.nc". Send me these two files, and I'll take a look.
>
> Thanks,
>
> --Mary
>
>
>
> On May 13, 2010, at 1:19 AM, Josh Thompson wrote:
>
>
>> Hi all,
>>
>> I am trying to produce some plots that are at a low resolution, but
>> only cover a very small area (something like 4x4 degrees). The problem
>> I am running into is, there don't seem to be enough points within the
>> area for NCL to make contours. I am using "AreaFill" and have tried
>> "RasterFill". With those two fill modes, I get a blank plot (except
>> outlines; also, the field is not constant 0). "CellFill" works, but I
>> need the smooth(rounded) contour lines. I know my data is good,
>> because I can successfully plot a larger area.
>>
>> My question is, is it possible to have the contour lines drawn with
>> consideration of points that aren't in the viewable area? In other
>> words, can I have NCL plot, and create smooth contours, with a large
>> area of points, then zoom into a smaller area while keeping the
>> contours intact?
>>
>> Thanks!
>>
>> -Josh Thompson
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