<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Dear Mary,<div> Thank you for your explanation. (Excuse me for my late response).</div><div><br></div><div> I have another question. I have some 1D data irregularly distributed over a region. I would like to plot these data on a 2D map, without gridding, without filling <span style="background-color: rgb(255, 255, 255);">polygons or triangles</span>. I just would like to show data in different colors (given different values) at their lat/lon locations. </div><div> For your information, it is over a small region (3 by 3 degree for the latitude/longitude range), and number of data is not enormous over the region. I tried contour_map with resources.cnFillOn=True, resources.cnFillMode=RasterFill; and it works. But it used <span style="background-color: rgb(255, 255, 255); color: rgb(51, 51, 51);">TriangularMesh. If I set </span>resources.cnFillOn=False, then it produces no points or color on the map. If you have any suggestion, then I would appreciate !</div><div><br></div><div> PS: If there is no way to display as I wished, then I would like just to add the data locations on the contour_map. Thanks in advance for your help.</div><div><br></div><div>Best regards</div><div><br></div><div>Xiaoni</div><div> <br><div><div>Le 27 oct. 2017 à 00:37, Mary Haley <<a href="mailto:haley@ucar.edu">haley@ucar.edu</a>> a écrit :</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div class="gmail_default" style="font-size:small">Xiaoni,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">I'm sorry for the delay. I didn't realize there was an unanswered question.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">When you say "specific value with white color" do you mean that you want to color a 0-level contour line in white, or that you want to specify a contour *fill* for values equal to 0?</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">As an example of specifying a particular color for a contour line, see spaghetti.py at:</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default"><a href="http://www.pyngl.ucar.edu/Examples/gallery.shtml">http://www.pyngl.ucar.edu/Examples/gallery.shtml</a><br></div><div class="gmail_default"><br></div><div class="gmail_default">This uses only one contour level, and sets the color for this level using cnLineColor and an index value:</div><div class="gmail_default"><br></div><div class="gmail_default"><font face="monospace, monospace">res.cnLevelSelectionMode = "ExplicitLevels" # explicit contour levels</font></div><div class="gmail_default"><font face="monospace, monospace">res.cnLevels = 5500 # which level(s) to plot</font></div><div class="gmail_default"><font face="monospace, monospace">res.cnLineColor = 1 # index 1 in default color table. Can also </font></div><div class="gmail_default"><font face="monospace, monospace"> # use a named color, like "white" </font> <br></div><div class="gmail_default"><br></div><div class="gmail_default">If you want to set multiple levels with multiple colors, then provide an array of values to cnLevels, and use cnLineColors to set the color for each.</div><div class="gmail_default"><br></div><div class="gmail_default">If you want to set the colors for filling between contour levels, then you can use cnFillColors. See example hdf3.py, which does this with:</div><div class="gmail_default"><br></div><div class="gmail_default"><div class="gmail_default"><font face="monospace, monospace">res.cnLevelSelectionMode = "ExplicitLevels"</font></div><div class="gmail_default"><font face="monospace, monospace">res.cnLevels = [0.01,0.02,0.04,0.08,0.16,0.32,0.64, 0.96]</font></div><div class="gmail_default"><font face="monospace, monospace">res.cnFillColors = ["white","cyan", "green","yellow",</font></div><div class="gmail_default"><font face="monospace, monospace"> "darkorange","red","magenta","purple","black"]</font></div><div class="gmail_default"><br></div></div><div class="gmail_default" style="font-size:small">--Mary</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Oct 19, 2017 at 3:41 AM, Xiaoni Wang <span dir="ltr"><<a href="mailto:xiaoni.wang@obspm.fr" target="_blank">xiaoni.wang@obspm.fr</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
May I ask how to plot a specific value (0 for example) with white color by using NGL in a 2D contour plot ? Thank you in advance !<br>
<br>
Best wishes,<br>
<br>
Xiaoni Wang<br>
<br>
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