<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif;"><div>Hello, </div><div><br></div><div>I’m attempting to regrid sea-ice concentrations from a coarse spatial resolution onto a higher-resolution grid. Both grids are NSIDC Sea Ice Polar Stereographic North with a WGS84 reference datum. The coarse product (<a href="https://nsidc.org/data/g02202">https://nsidc.org/data/g02202</a>) is 448X304, or a 25km nominal resolution. The higher-resolution product (<a href="http://nsidc.org/data/docs/noaa/g02186_masie/index.html">http://nsidc.org/data/docs/noaa/g02186_masie/index.html</a>) is 6144x6144, or a 4km nominal resolution.</div><div><br></div><div>The grid for the high-res product is a little funky in that it extends well beyond the equator, from the polar view (for added context, it is the 4km variant of the 24km grid handled here: <a href="http://www.ncl.ucar.edu/Applications/nic_ims.shtml">http://www.ncl.ucar.edu/Applications/nic_ims.shtml</a>). I’m wondering if this is causing some error in the ESMF_regrid routine, which is throwing two errors:</div><div><br></div><div>1. nonsensical values to the minimum Extlon2d and minimum ExtGridCenter_Lon, as seen in the processing log</div><div><br></div><div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>get_src_grid_info: source lat dims = (448,304)</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>get_src_grid_info: source lon dims = (448,304)</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>get_src_grid_info: source grid type is 'curvilinear'</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>curvilinear_to_SCRIP: calculating grid corners...</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>curvilinear_to_SCRIP: no lat values are at the poles, so</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> calculating grid corners using</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> calc_SCRIP_corners_noboundaries...</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>calc_SCRIP_corners_noboundaries</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max original lat: 31.1026717524309/89.8368159996152</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max original lon: -180/179.813975395493</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>calc_SCRIP_corners_noboundaries</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max Extlat2d: 30.8580632088782/89.8368159996152</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max Extlon2d: -539.812759557033/180.001207917857</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>calc_SCRIP_corners_noboundaries</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max ExtGridCenter_lat: 30.98047461780758/89.8368159996152</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max ExtGridCenter_lon: -269.812759557033/179.8151793919093</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>=====> CPU Elapsed Time: curvilinear_to_SCRIP: 0.109368 seconds <=====</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>get_dst_grid_info: destination lat dims = (6144,6144)</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>get_dst_grid_info: destination lon dims = (6144,6144)</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>curvilinear_to_SCRIP: calculating grid corners...</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>curvilinear_to_SCRIP: no lat values are at the poles, so</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> calculating grid corners using</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> calc_SCRIP_corners_noboundaries...</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>calc_SCRIP_corners_noboundaries</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max original lat: -21.4848/89.9729</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max original lon: -180/180</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>calc_SCRIP_corners_noboundaries</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max Extlat2d: -21.5023/89.9729</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max Extlon2d: -539.995/180</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span>calc_SCRIP_corners_noboundaries</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max ExtGridCenter_lat: -21.4935/89.9729</div><div>(0)<span class="Apple-tab-span" style="white-space:pre"> </span> min/max ExtGridCenter_lon: -269.988/179.989</div></div><div><br></div><div>And a second error:</div><div>2. NetCDF: One or more variable sizes violate format constraints</div><div><br></div><div>I tried converting longitudes to monotonic, but the output log still spit out large negative values (e.g. <<0). I’ve also added Opt@srcLargeFile and Opt@dstLargFile lines within the code as I see the resulting ‘destination-grid-file.nc’ is on the order of 3.15Gb in size.</div><div><br></div><div>Please find script attached. The data files in use for this script can be found here:</div><div>Coarse: <a href="ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G02202_v2/north/daily/2006/seaice_conc_daily_nh_f13_20060101_v02r00.nc">ftp://sidads.colorado.edu/pub/DATASETS/NOAA/G02202_v2/north/daily/2006/seaice_conc_daily_nh_f13_20060101_v02r00.nc</a></div><div>Fine: <a href="ftp://sidads.colorado.edu/DATASETS/NOAA/G02186/ancillary/masiemask_ims4km.nc">ftp://sidads.colorado.edu/DATASETS/NOAA/G02186/ancillary/masiemask_ims4km.nc</a></div><div><br></div><div>Thank you for the attention to this question and for any help.</div><div><br></div><div><div id="MAC_OUTLOOK_SIGNATURE"><div><div>-- </div><div><br></div></div><div><div style="font-family: -webkit-standard;"><b>Greg Deemer</b></div><div style="font-family: -webkit-standard;">User Services Office</div><div style="font-family: -webkit-standard;">National Snow and Ice Data Center</div><div style="font-family: -webkit-standard;">(303) 735-8068</div><div style="font-family: -webkit-standard;"><a href="http://nsidc.org/">http://nsidc.org</a></div><div style="font-family: -webkit-standard;">Twitter: @NSIDC</div></div></div></div></body></html>