<div dir="ltr"><div class="gmail_default" style="font-size:small">Erik</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">If this is a marker you want to put on map, then you can use a procedure called "nggcog". This will generate a lat/lon circle given a center lat/lon value. It mimics the Matlab scircle1 function</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default"><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/nggcog.shtml">http://www.ncl.ucar.edu/Document/Functions/Built-in/nggcog.shtml</a></div><div class="gmail_default"><div class="gmail_default"><font face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif">If you are not drawing markers on a map, then we have an unadvertised function in "shea_util.ncl" called "circle_ll", contributed by Arindam Chakraborty. It will draw circles or ellipses. Here's the documentation, which is found in the comments of the function in shea_util.ncl:</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><div class="gmail_default"><font face="monospace, monospace">; Draws a circle (or ellipse) or radius (or x-axis length) r centered at</font></div><div class="gmail_default"><font face="monospace, monospace">; (x0,y0). Optionally it can draw an ellipse a</font><span style="font-family:monospace,monospace">nd axes can be rotated as desired. </span><span style="font-family:monospace,monospace">; Input Parameters:</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; wks: graphics workstation</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; plt: the plot graphics</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; (x0,y0): center of the circle in terms of plot coordinate</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; r: radius (or x-direction length) of the circle in terms of plot coordinate</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; res: resources. If true can take any line graphic parameter valid</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; gsn_add_polyline. In addition, there are two s</span><span style="font-family:monospace,monospace">pecial resources</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; for this procedure:</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; Scale: The scale by which the y-axis length should be modified to</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; the x-axis length. This can be used to plot </span><span style="font-family:monospace,monospace">an ellipse. (default=1).</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; Rotation: The rotation angle (in degrees) by which the axes are rotated</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; (positive anticlockwhise). (default=0)</span><span style="font-family:monospace,monospace">.</span></div><div class="gmail_default"><span style="font-family:monospace,monospace">; </span></div></div><div class="gmail_default"><font face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif">I've attached two sample scripts that you can run.</font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif"><br></font></div><div class="gmail_default"><font face="arial, helvetica, sans-serif">--Mary</font></div><div class="gmail_default"><font face="monospace, monospace"><br></font></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Dec 1, 2016 at 8:46 AM, Rick Brownrigg <span dir="ltr"><<a href="mailto:brownrig@ucar.edu" target="_blank">brownrig@ucar.edu</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><div><div>Hi Erik,<br><br></div>I'm afraid that's the nature of the polymarker implementation. It might be possible for you to create your own circles, with a finer resolution, using NhlDataPolymarker. I have no experience with using it, so can't advise further"<br><br><a href="http://ncl.ucar.edu/Document/Functions/Built-in/NhlDataPolymarker.shtml" target="_blank">http://ncl.ucar.edu/Document/<wbr>Functions/Built-in/<wbr>NhlDataPolymarker.shtml</a><br><br></div>Hope that helps...<br></div>Rick<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Thu, Dec 1, 2016 at 7:12 AM, Erik Jan Schaffernicht <span dir="ltr"><<a href="mailto:eschaffe@uni-koeln.de" target="_blank">eschaffe@uni-koeln.de</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">Hi,<br>
<br>
I use:<br>
<br>
res@gsMarkerIndex = 4<br>
<br>
to plot hollow circles. But their circumferences/scopes look polygonal angular and jerky. See pic attached.<br>
<br>
Is their an easy way to improve this?<br>
<br>
Something about my pdf resolution?<br>
<br>
Or can I change sthg. in my wks output settings?<br>
<br>
Or is there another "hollow circle" glyph I can select, that looks more like a *round* circle?<br>
<br>
Thanks for your consideration,<br>
<br>
Erik<br>
<br>
<br>
<br>
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