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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Mary,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The combination below eliminated the map edge problems I was having when mapping the regional stereographic COAMPS grid. The mp resources used are analogous
to your NCL native example 6. Originally, I had mpCenterLatF = 80. And although this is the center lat of the grid, the relativeCenterLat is 90 for the stereographic projection. I believe this is the correct logic.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpLimitMode = "Corners"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpProjection = "Stereographic"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpLeftCornerLatF = lat[0,0]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpLeftCornerLonF = lon[0,0]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpRightCornerLatF = lat[ny-1,nx-1]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpRightCornerLonF = lon[ny-1,nx-1]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpRelativeCenterLon = True<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpCenterLonF = 358.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpRelativeCenterLat = True<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.mpCenterLatF = 90. ### Original value of 80.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> mpres.tfDoNDCOverlay = "NDCViewport"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Matt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Mary Haley [mailto:haley@ucar.edu]
<br>
<b>Sent:</b> Monday, June 25, 2018 11:05 AM<br>
<b>To:</b> Fearon, Dr. Matthew, Contractor, Code 7533<br>
<b>Cc:</b> pyngl-talk@ucar.edu<br>
<b>Subject:</b> Re: [pyngl-talk] mapping regional data with mpLimitMode corners<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Matt,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Sorry for the delay. I was creating a new NCL example to help explain things.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Plotting data in its native projection can be tricky, especially if you have a rotated pole or if you are not sure of the exact parameters for the map projection.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I think you already know this, but these resources are going to be critical to getting the map projection correct:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpProjection = "Stereographic"</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpLeftCornerLatF = lat[0,0]</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpLeftCornerLonF = lon[0,0]</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpRightCornerLatF = lat[ny-1,nx-1]</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpRightCornerLonF = lon[ny-1,nx-1]</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> </span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""># mpres.mpCenterRotF = -1</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpRelativeCenterLon = True</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpCenterLonF = 358.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpRelativeCenterLat = True</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mpres.mpCenterLatF = 80.</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It's likely going to be the center lat/lon settings that are the issue, and not the four corners of your data, since the way you are setting the corners looks correct to me.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Did the data come from a file that had the map projection parameters defined? If so, could you include the output from an ncdump -h of that file so I can see if there's anything that might have been left out?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I don't know if you saw these examples, but they might help (even though they are NCL-based, the same principles apply):<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="http://www.ncl.ucar.edu/Applications/native.shtml#ex1" target="_blank">http://www.ncl.ucar.edu/Applications/native.shtml#ex1</a><o:p></o:p></p>
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<p class="MsoNormal"><a href="http://www.ncl.ucar.edu/Applications/native.shtml#ex6">http://www.ncl.ucar.edu/Applications/native.shtml#ex6</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Example native_6.ncl is the one I just created. This was an example where we didn't know the correct center longitude, so I had to create a do loop to try different ones out. I also drew the lat/lon lines associated with the data (since
I had them), so I could see if they were straight or not. If the lines are straight, then this is a good sign that you have the correct map projection resources set.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Since you have the lat/lon arrays, you can also add the grid for debugging purposes. You can use Ngl.add_polyline for this. I've attached an example of adding lat/lon grid lines using dummy data.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hope this helps,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--Mary<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jun 20, 2018 at 2:14 PM, Fearon, Dr. Matthew, Contractor, Code 7533 via pyngl-talk <<a href="mailto:pyngl-talk@ucar.edu" target="_blank">pyngl-talk@ucar.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hello,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m using the following Ngl resources to map regional raster data with a stereographic projection onto a basemap. Things work fairly well, except I am able to see edges of the underlying
basemap. Please see figure one attached. When I include mpCenterRotF= -1, the basemap edge visibility is reduced, but still partially shown along the NW and SE edges. Please see figure two. I would like the data overlay to fill the window fully. I’ve tried
adjusting the lat corners by 0.5 to 1 degree, eg, mpRightCornerLatF = lat[ny-1,nx-1]-0.5 and mpLeftCornerLatF = lat[0,0]+0.5, to figure two but doing so seems to reveal the underlying basemap more – perhaps because rotation of -1 is active after I contract
my lat corners. Seems like this should be a simple fix, but here I struggle. Perhaps I should be mapping regional data differently? Any help or suggestions would be greatly appreciated.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thank you,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Matt<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.sfXArray = lon<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.sfYArray = lat<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpFillOn = True<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpLandFillColor = "Tan1"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpOceanFillColor = "SkyBlue"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpInlandWaterFillColor = "SkyBlue"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpGeophysicalLineThicknessF= 2.5<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpLimitMode = "Corners" #"LatLon"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpProjection = "Stereographic"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpLeftCornerLatF = lat[0,0]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpLeftCornerLonF = lon[0,0]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpRightCornerLatF = lat[ny-1,nx-1]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpRightCornerLonF = lon[ny-1,nx-1]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"># mpres.mpCenterRotF = -1<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpRelativeCenterLon = True<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpCenterLonF = 358.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpRelativeCenterLat = True<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpCenterLatF = 80.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.tfDoNDCOverlay = "DataTransform" #NDCViewport"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpGridLineThicknessF = 0.5<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpGridLineDashPattern = 2<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpGridSpacingF = 1<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> mpres.mpDataBaseVersion = "MediumRes"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> map_plot = Ngl.map(wks,mpres)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.cnFillOn = True<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.cnLinesOn = False<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.cnLineLabelsOn = False<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cmap = Ngl.read_colormap_file("MPL_PuOr")<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.cnFillPalette = cmap[::-1,:]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.cnLevelSelectionMode = "ExplicitLevels"<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.cnLevels = [-10,-8,-6,-4,-2,2,4,6,8,10]<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.lbAutoManage = False<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.pmLabelBarWidthF = 0.02<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> cnres.lbLabelFontHeightF = 0.009<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> contour_plot = Ngl.contour(wks,cvar,cnres)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Ngl.overlay(map_plot,contour_plot)<o:p></o:p></p>
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