<div dir="ltr"><div class="gmail_default" style="font-size:small">Christian,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Sorry for the delay. I think the issue you are having might have been fixed in a later release of NCL.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">I could try to verify this for you if you provide me with the two NetCDF files? We have an ftp you can use, as long as the files are not too large.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default"><a href="http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP">http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP</a><br></div><div class="gmail_default"><br></div><div class="gmail_default">Thanks</div><div class="gmail_default"><br></div><div class="gmail_default">--Mary</div><div class="gmail_default"><br></div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Apr 8, 2017 at 7:35 PM, Hogrefe, Christian <span dir="ltr"><<a href="mailto:Hogrefe.Christian@epa.gov" target="_blank">Hogrefe.Christian@epa.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p style="margin:0in 0in 12pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">Using NCL version 6.2.1, I am trying to use ESMF_regrid to interpolate data from a regular
lat/lon (0.1 x 0.1 degree) grid to an unstructured MPAS grid. I am working off of the ESMF_rect_to_unstruct.ncl template.</span></p>
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<p style="margin:0in 0in 12pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">I am providing the DstGridLat and DstGridLon values from an existing MPAS input file. This
MPAS mesh has nCells = 163842 cells and I am passing the double latCell(nCells) and double lonCell(nCells) variables to DstGridLat and DstGridLon.</span></p>
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<p style="margin:0in 0in 12pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">Once the script starts processing the destination grid, the following screen output appears:</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">(0)<span>
</span>get_dst_grid_info: destination lat dims = (163842)</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">(0)<span>
</span>get_dst_grid_info: destination lon dims = (163842)</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">(0)<span>
</span>unstructured_to_ESMF: triangulating the data ... this can be slow</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">(0)<span>
</span>min/max ElementVertices = 0/163841</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">(0)<span>
</span>unstructured_to_ESMF: total number of elements created: 327680</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">After that, the weights are being generated and the input data is interpolated . However,
the dimension of that interpolated output is 327680 (i.e. the number of “elements”), not 163842 (i.e. the number of destination lat/lon points specified). When I write out the interpolated data, it has 327680 values. That number of
<span> </span>“elements” matches the number of “Vertices” in my existing MPAS input file from which the DstGridLat and DstGridLon values were pulled.</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">I am sure I am missing something very basic, but I am stuck figuring out why the interpolated
data has more elements than I am expecting.</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">I am attaching the script, screen output, header of the destination lat/lon grid description
file provided to the script, and the headers of the SrcFileName, DstFileName, and ncf file containing the interpolated data that are created by the script.</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt"> </span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">I have also uploaded the files required to run the script (i.e. the
<span><a href="http://edgar_HTAP_NOx_emi_TRANSPORT_2010.0.1x0.1.nc" target="_blank">edgar_HTAP_NOx_emi_TRANSPORT_<wbr>2010.0.1x0.1.nc</a></span> file containing the data to be interpolated and the existing MPAS input file
<span><a href="http://static.90-25.usgs.nc" target="_blank">static.90-25.usgs.nc</a></span> containing the DstGridLat and DstGridLon values) to the anonymous ftp server.</span></p>
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">Thank you very much for your help,</span></p><span class="HOEnZb"><font color="#888888">
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<p style="margin:0in 0in 0pt;line-height:normal"><span style="font-family:"Times New Roman","serif";font-size:10pt">Christian</span></p>
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