Re: Extra Points on Contour Maps

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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Received on Thu May 13 09:59:29 2010