<div dir="ltr"><div class="gmail_default" style="font-size:small">Hi Juris,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">I ran your script on my Mac and it seemed to work fine. This is likely due to the fact I just upgraded my ESMF_RegridWeightGen to version 7.0.1 (NCL comes with 6.3.0rp1).</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">If you tell me what kind of system you have, I can try to build a new ESMF_RegridWeightGen for you.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Meanwhile, here's a modified version of your script that creates a panel plot, and also draws the grid lines of the destination grid so you can see where the two grids intersect. This script will only work once ESMF_RegridWeightGen is upgraded. I included the PNG images so you can see what it looks like.</div><div class="gmail_default" style="font-size:small"><br></div>Note: Once you have the WRF_to_CMC_RDPA_APCP_conserve.nc weights file and you feel that the regridding is working<div class="gmail_default" style="font-size:small;display:inline"> correctly</div>, then you can regrid subsequent variables by calling the following:<div class="gmail_default" style="font-size:small">
<p class="gmail-p1"><font face="monospace, monospace"><span class="gmail-s1"> Opt = True<br></span><span class="gmail-s1"> var_regrid = </span><span class="gmail-s2">ESMF_regrid_with_weights</span><span class="gmail-s1">(var,</span><span class="gmail-s3">"WRF_to_CMC_RDPA_APCP_conserve</span><span class="gmail-s3">.nc",Opt)</span></font></p></div>
<div class="gmail_default" style="font-size:small">--Mary</div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 21, 2017 at 5:05 PM, Juris Almonte <span dir="ltr"><<a href="mailto:Juris.Almonte@umanitoba.ca" target="_blank">Juris.Almonte@umanitoba.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">
Dear NCL help,
<div><br>
</div>
<div>I am having trouble regridding my WRF precipitation data (4 km) to a coarser grid (10 km grid with a polar stereographic projection) using the “conserve” method. I should note that it works for the “bilinear method”. I get the following error
when using the “conserve” method. I am using NCL V6.3.</div>
<div><br>
</div>
<div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172919.788 INFO PET0 Running with ESMF Version 6.3.0rp1</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 ~~~~~~~~~~~~~~~~~~~~ Concave Element Detected ~~~~~~~~~~~~~~~~~~~~</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 concave elem. id=683007</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 </div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 concave elem. coords (lon [-180 to 180], lat [-90 to 90]) (x,y,z)</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 ------------------------------<wbr>------------------------------<wbr>-----</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 0 (-100.720581, 89.804306) (-0.000635, -0.003356, 0.999994)</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 1 (-76.010437, 89.767494) (0.000981, -0.003938, 0.999992)</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 2 (-133.219574, 89.857407) (-0.001704, -0.001814, 0.999997)</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 3 (130.780121, 89.925125) (-0.000854, 0.000990, 0.999999)</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.034 ERROR PET0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<wbr>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<wbr>~~~~~~</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.035 ERROR PET0 ESMCI_Regrid_F.C:178 c_esmc_regrid_create() Invalid argument - Dst contains a concave cell</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.035 ERROR PET0 ESMCI_Regrid_F.C:434 c_esmc_regrid_create() Invalid argument Internal subroutine call returned Error</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.035 ERROR PET0 ESMF_Regrid.F90:321 ESMF_RegridStore Invalid argument - Internal subroutine call returned Error</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.035 ERROR PET0 ESMF_FieldRegrid.F90:1008 ESMF_FieldRegridStoreNX Invalid argument - Internal subroutine call returned Error</div>
<div style="margin:0px;font-size:13px;font-family:Menlo">20170621 172940.035 ERROR PET0 ESMF_RegridWeightGen.F90:1152 ESMF_RegridWeightGenFile Invalid argument - Internal subroutine call returned Error</div>
<div style="margin:0px;font-size:13px;font-family:Menlo"><br>
</div>
</div>
<div><br>
</div>
<div> I have searched the archives regarding this error and have changed the longitudes of both the source and destination grids so that it goes from 0-360 instead of -180 to 180 as suggested, but I still get the same error. I have FTP’d the files
in the following script.</div>
<div><br>
</div>
<div>
<div>load "$NCARG_ROOT/lib/ncarg/<wbr>nclscripts/csm/gsn_code.ncl"</div>
<div>load "$NCARG_ROOT/lib/ncarg/<wbr>nclscripts/csm/gsn_csm.ncl"</div>
<div>load "$NCARG_ROOT/lib/ncarg/<wbr>nclscripts/csm/contributed.<wbr>ncl"</div>
<div>load "$NCARG_ROOT/lib/ncarg/<wbr>nclscripts/esmf/ESMF_<wbr>regridding.ncl"</div>
<div><br>
</div>
<div>begin</div>
<div>;---Data file containing source grid</div>
<div> src_file = "/home/umalmonj/Jan_Apr_<wbr><a href="http://monthly_total_2d.nc">monthly_total_2d.nc</a>" ;;---Change (likely)</div>
<div> src_constants = "/global/scratch/umalmonj/WRF/<wbr>juris/CTRL/2D/<a href="http://wrfout_conus_constants.nc" target="_blank">wrfout_conus_<wbr>constants.nc</a>"</div>
<div> sfile = addfile(src_file,"r")</div>
<div> constants = addfile(src_constants,"r")</div>
<div><br>
</div>
<div>;---Get variable to regrid</div>
<div>prec_acc_nc = sfile->PREC_ACC_NC</div>
<div>var = dim_sum_n_Wrap(prec_acc_nc,0) ; this sums the variable for the 4 months</div>
<div> src_lat = constants->XLAT(0,:,:) ;;---Change (maybe)</div>
<div> src_lon = constants->XLONG(0,:,:) ;;---Change (maybe)</div>
<div> var@lat2d = src_lat ;;---Change (likely)</div>
<div> src_lon = where(src_lon.lt.0,src_lon+<wbr>360,src_lon)</div>
<div> var@lon2d=src_lon</div>
<div><br>
</div>
<div>;---Data file containing destination grid</div>
<div> dst_file = "/global/scratch/umalmonj/WRF/<wbr>juris/CaPA/<wbr>AccumulatedtotalPrecipitation.<wbr>nc" ;;---Change (likely)</div>
<div> dfile = addfile(dst_file,"r")</div>
<div> dst_lat = dfile->gridlat_0 ;;---Change (likely)</div>
<div> dst_long = dfile->gridlon_0 ;;---Change (likely)</div>
<div> dst_lon = where(dst_long.lt.0,dst_long+<wbr>360,dst_long)</div>
<div><br>
</div>
<div>;---Set up regridding options</div>
<div> Opt = True</div>
<div><br>
</div>
<div>;---"bilinear" is the default. "patch" and "conserve" are other options.</div>
<div> Opt@InterpMethod = "conserve" ; might want to use conservative for precip</div>
<div><br>
</div>
<div> Opt@WgtFileName = "<a href="http://curv_to_curv.nc" target="_blank">curv_to_curv.nc</a>" ; optional</div>
<div><br>
</div>
<div> Opt@SrcGridLat = src_lat ; source grid</div>
<div> Opt@SrcGridLon = src_lon</div>
<div> Opt@SrcRegional = True ;;--Change (maybe)</div>
<div> Opt@SrcFileName = src_file ; optional, but good idea</div>
<div> Opt@SrcGridMask = where(.not.ismissing(var),1,0) ; Necessary if has</div>
<div> ; missing values.</div>
<div><br>
</div>
<div><br>
</div>
<div> Opt@DstGridLat = dst_lat ; destination grid</div>
<div> Opt@DstGridLon = dst_lon</div>
<div> Opt@DstRegional = True ;;--Change (maybe)</div>
<div> Opt@DstGridMask = where(.not.ismissing(dst_lat).<wbr>and.\</div>
<div> .not.ismissing(dst_lon),1,0) ; Necessary if lat/lon</div>
<div> ; has missing values.</div>
<div>; there is an attribute in the dest. file called "corners", but there are four</div>
<div>; diff. numbers for both the lon and lat variables</div>
<div>; just let NCL figure out the corners...</div>
<div>; Opt@DstLLCorner = (/12.21208,217.1075/)</div>
<div>; Opt@DstURCorner = (/79.82558,147.6248/)</div>
<div> Opt@ForceOverwrite = True</div>
<div> Opt@PrintTimings = True</div>
<div> Opt@Debug = True</div>
<div><br>
</div>
<div> var_regrid = ESMF_regrid(var,Opt) ; Do the regridding</div>
<div><br>
</div>
<div> printVarSummary(var_regrid)</div>
<div><br>
</div>
</div>
<div><br>
</div>
<div>Any help would be greatly appreciated,</div>
<div><br>
</div>
<div>Juris</div>
<div><br>
</div>
<div><br>
</div>
</div>
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<br></blockquote></div><br></div>