<div dir="ltr"><div class="gmail_default" style="font-size:small">Hi Meina,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">The "streaking" that's occurring I think is because when you plot random data using NCL, it is trying to smooth the data by default, using a non-convex polygon that encloses all your data points.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Try drawing raster contours instead, by setting:</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"> res@cnFillMode = "RasterFill" ; draw raster contours instead of smoothed contours</div><div class="gmail_default"><br></div><div class="gmail_default">If you want to mask all areas except California, see example mask_8.ncl which is similar:</div><div class="gmail_default"><br></div><div class="gmail_default"><a href="http://www.ncl.ucar.edu/Applications/mask.shtml#ex8">http://www.ncl.ucar.edu/Applications/mask.shtml#ex8</a><br></div><div class="gmail_default"><br></div><div class="gmail_default">I think in your case you could set:</div><div class="gmail_default"><br></div><div class="gmail_default"><pre> res@mpDataBaseVersion = "MediumRes"
res@mpFillAreaSpecifiers = (/"Land", "California","Water"/)
res@mpSpecifiedFillColors = (/"white","transparent","white"/)
res@cnFillDrawOrder = "PreDraw" ; Make sure map fill happens
; last.</pre></div><div class="gmail_default">I will update the station_1 example to reflect the difference b/w smooth and raster fill.</div><div class="gmail_default"><br></div><div class="gmail_default"><br></div><div class="gmail_default">--Mary</div><div class="gmail_default"><br></div><div class="gmail_default"><br></div><div class="gmail_default"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 11, 2017 at 9:00 PM, Meina Wang <span dir="ltr"><<a href="mailto:mnawang@ucdavis.edu" target="_blank">mnawang@ucdavis.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 class="gmail_default" style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)"><div class="gmail_default" style="font-size:13px">Dear NCL users:</div><div class="gmail_default" style="font-size:13px"><br></div><div class="gmail_default" style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><font face="arial, helvetica, sans-serif" style="color:rgb(0,0,0)">I ran into a problem when trying to use the function </font><span style="font-family:Menlo;font-size:12px">gsn_csm_contour_map_c<wbr>e </span><span style="font-size:12px"><font face="arial, helvetica, sans-serif">to plot station data (with latitude and longitude). I followed<a href="https://www.ncl.ucar.edu/Applications/Scripts/station_1.ncl" target="_blank"> this example </a>form NCL website and got the figure with "noise" over region where there is no input data point (over Nevada). The plot is attached below, with black dots showing the data points, and color contour underneath is plotted from </font></span><span style="font-family:Menlo;font-size:12px">gsn_csm_contour_map_ce </span><font face="arial, helvetica, sans-serif"><span style="font-size:12px">fu<wbr>nction, so there is no data over Nevada, while the function still extrapolate values over there</span><span style="font-size:12px">. </span></font></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:13px"><span style="font-size:12px;color:rgb(34,34,34)"><font face="arial, helvetica, sans-serif"><br></font></span></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:13px"><span style="font-size:12px;color:rgb(34,34,34)"><font face="arial, helvetica, sans-serif">Below are the main res setting for plotting station data: </font></span></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><p style="margin:0px;font-size:12px;font-family:Menlo"> res@sfXArray = lons</p><p style="margin:0px;font-size:12px;font-family:Menlo"> res@sfYArray = lats</p></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><p style="margin:0px;font-size:12px;font-family:Menlo;min-height:14px"><br></p><p style="margin:0px;font-size:12px;font-family:Menlo"> plot=gsn_csm_contour_map_ce(wk<wbr>s,w,res1)</p><p style="margin:0px;font-size:12px;font-family:Menlo"><br></p></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,helvetica,sans-serif;font-size:12px">Has any one had this problem before? Any thoughts or suggestion is much appreciated! Thank you.</span><br></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,helvetica,sans-serif;font-size:12px"><br></span></div><div style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)">Best,</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)">Meina</div></div></div><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br><div class="m_-8474300382929384854gmail_signature"><div dir="ltr"><div><div dir="ltr"><font size="2" color="#000000" style="background-color:rgb(255,255,255)" face="arial, helvetica, sans-serif">Meina Wang</font><div><font size="2" color="#000000" style="background-color:rgb(255,255,255)" face="arial, helvetica, sans-serif">PhD candidate in Atmospheric Science</font></div><div><font size="2" color="#000000" style="background-color:rgb(255,255,255)" face="arial, helvetica, sans-serif">Department of Land, Air and Water Resources</font></div><div><font size="2" color="#000000" style="background-color:rgb(255,255,255)" face="arial, helvetica, sans-serif">University of California, Davis</font></div><div><font size="2" color="#000000" style="background-color:rgb(255,255,255)" face="arial, helvetica, sans-serif">Davis, CA 95616</font></div></div></div></div></div>
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