<div dir="ltr">Hi Evelyn,<div>Dave is exactly correct in what is going on here. The contouring/shading for the missing areas are being drawn correctly regardless of the setting of cnFIllMode. The missing value perimeter line is being drawn at the center of the grid cells <i>next to</i> grid cells set to _FIllValue regardless of the setting of cnFIllMode. When you set cnFillMode = "RasterFill" NCL does not need to look at neighboring grid cells for shading and can shade the whole cell, thus decreasing the shaded missing areas.</div><div><br></div><div>The question then is should NCL change the position of the missing value perimeter line depending on the setting of cnFillMode? That would likely create as many questions as the current set up. </div><div><br></div><div>Thanks for sending a short easy-to-read script and your data files. That always makes testing things easier. I do have a solution for you. I created a second plot where cnFillColor is set to transparent and cnFillMode = "AreaFill". Thus, the only aspect of the original plot being drawn is the missing value shading and perimeter line. I then overlay this plot on the original plot. See the attached script and resulting output graphic. Note that if you are going to frequently switch between a setting of RasterFill and AreaFill it might be good to put the overlay plot coding into a user-defined function instead of an if statement like I did.</div><div><br></div><div>Hope that all makes sense. If you have any questions let ncl-talk know. And thanks to Dave for chiming in and identifying what was going on.</div><div>Adam</div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 19, 2015 at 4:45 PM, Dave Allured - NOAA Affiliate <span dir="ltr"><<a href="mailto:dave.allured@noaa.gov" target="_blank">dave.allured@noaa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Adam,</div><div><br></div><div>I think this is a very old issue; I have seen this before with RasterFill. Actually there IS a difference in how missing values are shaded, and it is normal. The problem is with the the perimeter lines, not the missing value shading.</div><div><br></div><div>Missing value areas are drawn correctly in both modes, it is just that the area shaded for non-missing data is naturally larger in RasterFill mode than in AreaFill mode. RasterFill draws the normal shaded data areas an extra 1/2 cell width into missing value regions.</div><div><br></div>As far as I can remember, the missing value perimeter line has ALWAYS followed edges as generated by AreaFill, regardless of alternate cnFillMode settings. I do not know whether there was ever any intention of changing the perimeter line to follow the cnFillMode, or whether this was just a feature intended only for normal AreaFill mode. I did not find any clues in ContourPlot documentation. HTH.<div><br></div><div>--Dave<div><br><br><div><div class="gmail_extra"><div class="gmail_quote">On Wed, Nov 18, 2015 at 4:45 PM, Adam Phillips <span dir="ltr"><<a href="mailto:asphilli@ucar.edu" target="_blank">asphilli@ucar.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Hi Evelyn,<div>There should not be any difference in how the missing values are shaded. Can you send us a simplified version of your script and data files so we can take a look? If the data files are too big to send over ncl-talk you can use our ftp site:</div><div><a href="http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP" target="_blank">http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP</a></div><div>Also, please let us know what version of NCL you are using..</div><div>Adam</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Nov 17, 2015 at 2:50 PM, Evelyn Grell - NOAA Affiliate <span dir="ltr"><<a href="mailto:evelyn.grell@noaa.gov" target="_blank">evelyn.grell@noaa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><div style="font-family:tahoma,sans-serif">Hi,</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">I am plotting cross-sections and was filling the area below ground with a gray fill, more or less representing the terrain. This seemed to be working fine until I plotted a field using cnFillMode = "RasterFill". In that case, the "missing" perimeter line is in the same place, but the gray fill does not cover the entire area under the perimeter line. See attached plots.</div><div style="font-family:tahoma,sans-serif">Since I would like to compare plots -- some with rasterfill and some with the default areafill, it is awkward to explain why the terrain looks different. Is there a way around this? I can remove the perimeter line, but the gray-filled area is different. </div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">Relevant resources:</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif"> res@cnMissingValPerimOn = True</div><div style="font-family:tahoma,sans-serif"> res@cnMissingValFillColor = "gray"</div><div style="font-family:tahoma,sans-serif"> res@cnMissingValFillPattern = 0</div><div style="font-family:tahoma,sans-serif"><br></div><div style="font-family:tahoma,sans-serif">The only difference between plots is whether this line is used:</div><div><font face="tahoma, sans-serif"> resDBZ@cnFillMode = "RasterFill"</font><br></div><div><font face="tahoma, sans-serif"><br></font></div><div><font face="tahoma, sans-serif">Thanks,</font></div><div><font face="tahoma, sans-serif">Evelyn</font></div></div></div></blockquote></div></div></blockquote></div></div></div></div></div></div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><div><span><font color="#888888">Adam Phillips <br></font></span></div><span><font color="#888888">Associate Scientist, </font></span><span><font color="#888888">Climate and Global Dynamics Laboratory, NCAR<br></font></span></div></div><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli/" target="_blank">www.cgd.ucar.edu/staff/asphilli/</a> </font></span><span><font color="#888888">303-497-1726 </font></span></div><span><font color="#888888"></font></span><div><div><span><font color="#888888"><br></font></span><div><span><font color="#888888"><a href="http://www.cgd.ucar.edu/staff/asphilli" target="_blank"></a></font></span></div></div></div></div></div></div></div></div></div></div></div>
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