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<p class="MsoNormal">Hi Lesley<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sorry, can’t point you to a detailed explanation, but the default contouring mode is ‘AreaFill’, and there is a bit of a description under the ‘cnFillMode’ resource help entry.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Have you tried setting cnFillMode = “RasterFill”, with the same explicit levels? I suspect it will ‘digitise’ the filling in the way that you want (but I don’t know).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Will<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">ncl-talk <ncl-talk-bounces@ucar.edu> on behalf of Lesley Smith - NOAA Affiliate via ncl-talk <ncl-talk@ucar.edu><br>
<b>Reply-To: </b>Lesley Smith - NOAA Affiliate <lesley.l.smith@noaa.gov><br>
<b>Date: </b>Friday, 1 November 2019 at 11:49 AM<br>
<b>To: </b>ncl-talk <ncl-talk@ucar.edu><br>
<b>Subject: </b>[ncl-talk] how does interpolation work in contour plot?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi ncl-talk, <o:p></o:p></p>
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<p class="MsoNormal">I'm trying to plot the season of the year with maximum precipitation<o:p></o:p></p>
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<p class="MsoNormal">for each grid-point in the U.S.<o:p></o:p></p>
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<p class="MsoNormal">I created a matrix of output, dimensioned lat x lon.<o:p></o:p></p>
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<p class="MsoNormal">There are only 4 possible (integer)values: 1,2,3,4 <--which I checked.<o:p></o:p></p>
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<p class="MsoNormal">(1 is DJF, 2 is MAM, etc. I'll make this pretty later.) <o:p></o:p></p>
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<p class="MsoNormal">I get the attached plot, cam1x1_maxx_doy_precip.r01.1901.jpg,<o:p></o:p></p>
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<p class="MsoNormal">(which I hope you can see) which I believe is correct.<o:p></o:p></p>
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<p class="MsoNormal">However, I do not understand why there appear to be so many floats<o:p></o:p></p>
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<p class="MsoNormal">in the plot. Is there some kind of interpolation going on?<o:p></o:p></p>
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<p class="MsoNormal">When I try to set the contour levels explicitly, 1,2,3,4 I do<o:p></o:p></p>
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<p class="MsoNormal">not seem to get a correct result.<o:p></o:p></p>
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<p class="MsoNormal">Thus, it would be awesome if someone could point me to <o:p></o:p></p>
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<p class="MsoNormal">a page explaining interpolation in contour plots.<o:p></o:p></p>
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<p class="MsoNormal">Thanks very much!<o:p></o:p></p>
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<p class="MsoNormal">-Lesley Smith<o:p></o:p></p>
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