<div dir="ltr"><div>[1] *You* have to decide on the target rectilinear grid using</div><div>       min(lat1d), max(lat1d), min(lon1d),max(lon1d) and desired spacing<br></div><div>[2] ESMF regridding: <a href="https://www.ncl.ucar.edu/Applications/ESMF.shtml"><b>https://www.ncl.ucar.edu/Applications/ESMF.shtml</b></a></div><div>     Example:   ESMF_regrid_14.ncl</div><div>            <br><pre>;---Original lat/lon
    res@sfXArray              = lon1d
    res@sfYArray              = lat1d<br><br>===<br></pre><pre>Nearest neighbor: ESMF_regrid_neareststod_10.ncl</pre></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 26, 2020 at 8:56 AM Tabish Ansari via ncl-talk <<a href="mailto:ncl-talk@ucar.edu">ncl-talk@ucar.edu</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 dir="ltr"><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Hi</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">I have got emissions data at 1km resolution as a text file. They were derived from high resolution shapefile polygons. The emissions value for each polygon was assigned to the lat/lon of the centroid of each polygon. Naturally, these centroids do not occur at equal lat/lon spacing. Currently, my data looks like this:</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">LON LAT CO NOX SO2 NMVOC NH3 BC PM25 PM10<br> -11.5746   48.3209    0.0001    0.0009    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000<br> -11.5655   48.3198    0.0081    0.0857    0.0004    0.0031    0.0000    0.0005    0.0015    0.0016<br> -11.5530   48.3183    0.0213    0.2257    0.0011    0.0080    0.0000    0.0013    0.0040    0.0043<br> -11.5402   48.3177    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -11.5267   48.3181    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -11.5133   48.3185    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -11.4998   48.3189    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4445   48.0253    0.0065    0.0686    0.0003    0.0024    0.0000    0.0004    0.0012    0.0013<br> -10.4394   48.0247    0.0031    0.0330    0.0002    0.0012    0.0000    0.0002    0.0006    0.0006<br> -10.4699   48.0345    0.0017    0.0178    0.0001    0.0006    0.0000    0.0001    0.0003    0.0003<br> -10.4600   48.0327    0.0166    0.1766    0.0009    0.0063    0.0000    0.0010    0.0031    0.0034<br> -10.4477   48.0314    0.0280    0.2971    0.0015    0.0106    0.0000    0.0018    0.0053    0.0057<br> -10.4386   48.0320    0.0100    0.1064    0.0005    0.0038    0.0000    0.0006    0.0019    0.0020<br> -10.4953   48.0438    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000    0.0000<br> -10.4863   48.0421    0.0092    0.0976    0.0005    0.0035    0.0000    0.0006    0.0017    0.0019<br> -10.4745   48.0401    0.0253    0.2689    0.0013    0.0096    0.0000    0.0016    0.0048    0.0051<br> -10.4615   48.0400    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4482   48.0403    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4376   48.0408    0.0159    0.1690    0.0008    0.0060    0.0000    0.0010    0.0030    0.0032<br> -10.5117   48.0513    0.0032    0.0339    0.0002    0.0012    0.0000    0.0002    0.0006    0.0006<br> -10.5012   48.0493    0.0196    0.2077    0.0010    0.0074    0.0000    0.0012    0.0037    0.0040<br> -10.4888   48.0484    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4754   48.0487    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4620   48.0490    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4486   48.0493    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4367   48.0498    0.0218    0.2315    0.0011    0.0083    0.0000    0.0014    0.0041    0.0044<br> -10.5371   48.0605    0.0003    0.0031    0.0000    0.0001    0.0000    0.0000    0.0001    0.0001<br> -10.5279   48.0588    0.0121    0.1287    0.0006    0.0046    0.0000    0.0008    0.0023    0.0025<br> -10.5158   48.0570    0.0268    0.2839    0.0014    0.0101    0.0000    0.0017    0.0051    0.0054<br> -10.5026   48.0571    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4892   48.0574    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> -10.4758   48.0577    0.0282    0.2991    0.0015    0.0107    0.0000    0.0018    0.0053    0.0057<br> </div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Is there a way to interpolate this data to a regular grid using NCL?</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Thanks</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Tabish<br></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br clear="all"></div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div><span style="color:rgb(11,83,148)"><i><span style="font-family:verdana,sans-serif"><font size="1">Tabish U Ansari<br></font></span></i></span></div><span style="color:rgb(11,83,148)"><i><span style="font-family:verdana,sans-serif"><font size="1">Postdoctoral Researcher <br></font></span></i></span></div><div><span style="color:rgb(11,83,148)"><i><span style="font-family:verdana,sans-serif"><font size="1">Centre for Climate and Air Pollution Studies (C-CAPS)<br></font></span></i></span></div><div><span style="color:rgb(11,83,148)"><i><span style="font-family:verdana,sans-serif"><font size="1">School of Physics, NUI-Galway</font></span></i><font size="1"><span style="font-family:tahoma,sans-serif"><i><span style="font-family:verdana,sans-serif">, Ireland</span></i><br></span></font></span></div><div><span style="color:rgb(11,83,148)"><font size="1"><span style="font-family:tahoma,sans-serif"><i><span style="font-family:verdana,sans-serif">ResearchGate: <a href="https://www.researchgate.net/profile/Tabish_Ansari" target="_blank">https://www.researchgate.net/profile/Tabish_Ansari</a></span></i><br></span></font></span></div></div></div></div></div></div></div>
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