<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>interpolation For plotting,  interpolation to a grid is <b>NOT</b> necessary.</div><div><br></div><div dir="ltr"><a href="http://www.ncl.ucar.edu/Applications/station.shtml" target="_blank"><b>http://www.ncl.ucar.edu/Applications/station.shtml</b></a></div><div>Example 1</div><div>============</div><div><a href="http://www.ncl.ucar.edu/Applications/contour1d.shtml" target="_blank"><b>http://www.ncl.ucar.edu/Applications/contour1d.shtml</b></a></div><div>Examples 1 & 3</div><div>===============================================<br></div><div>Keep in mind, <b>if you do not have physics to guide you</b><br></div><div><br></div><div>(1) there is *no substitute* for lots of data points.</div><div>(2) extrapolation is *always* dangerous<br></div><div>================================================</div><div><b>Unstructured to Grid:</b></div><div><br></div><div><a href="https://www.ncl.ucar.edu/Applications/ESMF.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Applications/ESMF.shtml<br></b></a></div><div>Example 21<br></div><div>=====</div><div><div><a href="http://www.ncl.ucar.edu/Applications/contour1d.shtml" target="_blank"><b>http://www.ncl.ucar.edu/Applications/contour1d.shtml</b></a></div></div><div><br></div><div>Some <b>interpolation</b> functions that may be of use.<br></div><div><b><br></b></div><div><a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/cssgrid_Wrap.shtml" target="_blank"><b>http://www.ncl.ucar.edu/Document/Functions/Contributed/cssgrid_Wrap.shtml</b></a><br></div><div><a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/obj_anal_ic_Wrap.shtml" target="_blank"><b>http://www.ncl.ucar.edu/Document/Functions/Contributed/obj_anal_ic_Wrap.shtml</b></a></div><div><a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/triple2grid_Wrap.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Contributed/triple2grid_Wrap.shtml</b></a></div><div><br></div><div><b>See Examples 3 & 4</b></div><div><a href="https://www.ncl.ucar.edu/Applications/rdm2grid.shtml#ex3" target="_blank"><b>https://www.ncl.ucar.edu/Applications/rdm2grid.shtml#ex3</b></a><br></div></div></div></div></div></div></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 5, 2019 at 11:53 AM MeteoBB <<a href="mailto:info@meteo-bb.de" target="_blank">info@meteo-bb.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF">
    Thx Rick for your quick response.<br>
    <br>
    Playing a little bit with the smooth-Parameter of the cn-resources
    yields the plot attached.<br>
    <font face="Courier New"><br>
      <b>res@cnSmoothingOn        = True</b><b><br>
      </b><b>res@cnSmoothingDistanceF = 0.005 ;(usw 0.005 ... 0.03)</b></font><br>
    <br>
    An area left is getting colored. (there is no station!)<br>
    This is risky i think, if I set the parameter (hardcoded). I never
    know what the graphics will look like.<br>
     <br>
    Do you think i should try interpolate the station data from my
    unstructured grid to a rectilinear grid using <b>natgrid</b>? <br>
    <br>
    MeteoBB<br>
    <br>
    <div class="gmail-m_-523433163998621343gmail-m_288553170242397455gmail-m_5378693543236316164moz-cite-prefix">Am 05.02.2019 um 19:04 schrieb Rick
      Brownrigg:<br>
    </div>
    <blockquote type="cite">
      
      <div dir="ltr">
        <div>You might take a look at the several resources associated
          with "<strong>cnSmoothingOn"  <br>
          </strong></div>
        <div><br>
        </div>
        <div>HTH...Rick<br>
        </div>
        <div><strong></strong></div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Tue, Feb 5, 2019 at 10:22
          AM MeteoBB <<a href="mailto:info@meteo-bb.de" target="_blank">info@meteo-bb.de</a>> wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
          <div bgcolor="#FFFFFF"> Hello,<br>
            <br>
            I tried to plot station data of surface temperature on a map
            as a contour plot. I'm not satisfied with the result (see
            attached picture AreaFill.png).<br>
            It all seems so angular. My grid is not regular because of
            the station data. <br>
            <br>
            Switching from AreaFill to RasterFill results in a litte
            better plot (smooth contours) as you can see in the picture
            attached (RasterFill.png).<br>
            <b><font face="Courier New">res@cnFillMode = "AreaFill"<br>
                res@cnFillMode = "RasterFill"</font></b><br>
            <br>
            I tried to regrid the triangular mesh (unstructured) station
            data to a structured grid using <b>natgrid</b>?<br>
            But it fails ...<br>
            <br>
            Do you have any ideas for a better plot? Or what is the
            correct way to plot such station data as contour?<br>
            <br>
            Regards<br>
            MeteoBB<br>
          </div>
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      </div>
    </blockquote>
    <br>
  </div>

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