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Dear helpdesk,
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<div class="">I am trying to remap between two global grids (POP and CLM grids within CESM) using ESMF_regrid. When I use the bilinear method everything is fine, but when I set the interpolation method to ‘conserve’ I get the following error </div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 ~~~~~~~~~~~~~~~~~~~~ Concave Element Detected ~~~~~~~~~~~~~~~~~~~~</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 concave elem. id=87076</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 concave elem. coords (lon [-180 to 180], lat [-90 to 90]) (x,y,z)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 -----------------------------------------------------------------</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 0 (-0.810791, 26.868742) (0.891955, -0.012623, 0.451948)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 1 (-179.690491, 26.890459) (-0.891860, -0.004818, 0.452286)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 2 (-179.702637, 27.371189) (-0.888035, -0.004609, 0.459753)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 3 (-0.822662, 27.348597) (0.888136, -0.012753, 0.459403)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.017 ERROR PET0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.018 ERROR PET0 ESMCI_Regrid_F.C:149 c_esmc_regrid_create() Invalid argument - Src contains a concave cell</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.019 ERROR PET0 ESMCI_Regrid_F.C:434 c_esmc_regrid_create() Invalid argument Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.019 ERROR PET0 ESMF_Regrid.F90:321 ESMF_RegridStore Invalid argument - Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.019 ERROR PET0 ESMF_FieldRegrid.F90:1008 ESMF_FieldRegridStoreNX Invalid argument - Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115834.019 ERROR PET0 ESMF_RegridWeightGen.F90:1152 ESMF_RegridWeightGenFile Invalid argument - Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115931.854 INFO PET0 Running with ESMF Version 6.3.0rp1</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115931.888 INFO PET0 Running with ESMF Version 6.3.0rp1</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115931.946 INFO PET0 Running with ESMF Version 6.3.0rp1</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 ~~~~~~~~~~~~~~~~~~~~ Concave Element Detected ~~~~~~~~~~~~~~~~~~~~</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 concave elem. id=87076</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 concave elem. coords (lon [-180 to 180], lat [-90 to 90]) (x,y,z)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 -----------------------------------------------------------------</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 0 (-0.810791, 26.868742) (0.891955, -0.012623, 0.451948)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 1 (-179.690491, 26.890459) (-0.891860, -0.004818, 0.452286)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 2 (-179.702637, 27.371189) (-0.888035, -0.004609, 0.459753)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 3 (-0.822662, 27.348597) (0.888136, -0.012753, 0.459403)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 ESMCI_Regrid_F.C:149 c_esmc_regrid_create() Invalid argument - Src contains a concave cell</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 ESMCI_Regrid_F.C:434 c_esmc_regrid_create() Invalid argument Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 ESMF_Regrid.F90:321 ESMF_RegridStore Invalid argument - Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.251 ERROR PET0 ESMF_FieldRegrid.F90:1008 ESMF_FieldRegridStoreNX Invalid argument - Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 115933.253 ERROR PET0 ESMF_RegridWeightGen.F90:1152 ESMF_RegridWeightGenFile Invalid argument - Internal subroutine call returned Error</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 120325.539 INFO PET0 Running with ESMF Version 6.3.0rp1</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 120325.574 INFO PET0 Running with ESMF Version 6.3.0rp1</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">20181030 120325.626 INFO PET0 Running with ESMF Version 6.3.0rp1</span></div>
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</span></div>
<div class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Below the messages during runtime (I am using the debug flag)</span></div>
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</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>Longitude (T grid) (degrees_east) : min=0.0159107 max=359.995</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>Latitude (T grid) (degrees_north) : min=-79.22 max=89.6524</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>longitude (degrees east) : min=0 max=358.7499999999999</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>latitude (degrees north) : min=-90 max=90</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>get_src_grid_info: source lat dims = (384,320)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>get_src_grid_info: source lon dims = (384,320)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>get_src_grid_info: source grid type is 'curvilinear'</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>curvilinear_to_SCRIP: calculating grid corners...</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>curvilinear_to_SCRIP: no lat values are at the poles, so</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> calculating grid corners using</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> calc_SCRIP_corners_noboundaries...</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>calc_SCRIP_corners_noboundaries</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max original lat: -79.22/89.6524</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max original lon: 0.0159107/359.995</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>calc_SCRIP_corners_noboundaries</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max Extlat2d: -79.7543/89.6524</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max Extlon2d: 0.0159107/359.995</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>calc_SCRIP_corners_noboundaries</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max ExtGridCenter_lat: -79.4871/89.6421</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max ExtGridCenter_lon: 0.606546/359.423</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>=====> CPU Elapsed Time: curvilinear_to_SCRIP: 0.112 seconds <=====</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>get_dst_grid_info: destination lat dims = (192,288)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>get_dst_grid_info: destination lon dims = (192,288)</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>curvilinear_to_SCRIP: calculating grid corners...</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>curvilinear_to_SCRIP: one or more lat values are at the</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> poles, so calculating grid corners using</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> calc_SCRIP_corners_boundaries...</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>calc_SCRIP_corners_boundaries</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max original lat: -90/90</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max original lon: 0/358.7499999999999</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>calc_SCRIP_corners_boundaries</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max grid_corner_lat2d: -90/90</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max grid_corner_lon2d: 0/358.7499999999999</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>calc_SCRIP_corners_boundaries</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max grid_corner_lat: -90/90</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> min/max grid_corner_lon: 0/358.7499999999999</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>=====> CPU Elapsed Time: curvilinear_to_SCRIP: 1.708 seconds <=====</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>ESMF_regrid_gen_weights: number of processors used: 1</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>--------------------------------------------------</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>ESMF_regrid_gen_weights: the following command is about to be executed on the system:</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>'ESMF_RegridWeightGen --source source_grid_file.nc --destination destination_grid_file.nc --weight weights_file.nc --method conserve -i --norm_type fracarea'</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>--------------------------------------------------</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>ESMF_regrid_gen_weights: output from 'ESMF_RegridWeightGen':</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span> Starting weight generation with these inputs: </span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(1)<span class="Apple-tab-span" style="white-space:pre">
</span> Source File: source_grid_file.nc</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(2)<span class="Apple-tab-span" style="white-space:pre">
</span> Destination File: destination_grid_file.nc</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(3)<span class="Apple-tab-span" style="white-space:pre">
</span> Weight File: weights_file.nc</span></div>
</span></div>
<div class="">
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<span style="font-variant-ligatures: no-common-ligatures" class="">(4)<span class="Apple-tab-span" style="white-space:pre">
</span> Source File is in SCRIP format</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(5)<span class="Apple-tab-span" style="white-space:pre">
</span> Source Grid is a global grid</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(6)<span class="Apple-tab-span" style="white-space:pre">
</span> Source Grid is a logically rectangular grid</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(7)<span class="Apple-tab-span" style="white-space:pre">
</span> Destination File is in SCRIP format</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(8)<span class="Apple-tab-span" style="white-space:pre">
</span> Destination Grid is a global grid</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(9)<span class="Apple-tab-span" style="white-space:pre">
</span> Destination Grid is a logically rectangular grid</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(10)<span class="Apple-tab-span" style="white-space:pre">
</span> Regrid Method: conserve</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(11)<span class="Apple-tab-span" style="white-space:pre">
</span> Pole option: NONE</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(12)<span class="Apple-tab-span" style="white-space:pre">
</span> Ignore unmapped destination points</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(13)<span class="Apple-tab-span" style="white-space:pre">
</span> Norm Type: fracarea</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(14)<span class="Apple-tab-span" style="white-space:pre">
</span> </span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(15)<span class="Apple-tab-span" style="white-space:pre">
</span> ERROR: Problem on processor 0 </span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(16)<span class="Apple-tab-span" style="white-space:pre">
</span> . Please see the PET*.RegridWeightGen.Log files for a traceback.</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>--------------------------------------------------</span></div>
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<span style="font-variant-ligatures: no-common-ligatures" class="">(0)<span class="Apple-tab-span" style="white-space:pre">
</span>ESMF_regrid_gen_weights: 'ESMF_RegridWeightGen' was not successful.</span></div>
</div>
<div class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class="">
</span></div>
<div class="">Reading previous questions answer, as far as I understand this can be solved by playing with lat/lon corners - but I am not sure if this applies to this case, too - and the explicit solution was communicated offline, so I am not sure how to proceed.</div>
<div class=""><br class="">
</div>
<div class="">Also, I see that by updating ESMF to version 7.0.1 this problem should not occur anymore - but I am running the ncl script on Cheyenne cluster, and i am not sure how to updated ESMF via module load. </div>
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</div>
<div class="">thanks for you help!</div>
<div class="">Michele</div>
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******************************************************************<br class="">
Michele Petrini, PhD </div>
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<br class="">
Department of Geoscience and Remote Sensing, TUDelft<br class="">
Delft, The Netherlands<br class="">
<br class="">
<a href="mailto:M.Petrini@tudelft.nl" class="">M.Petrini@tudelft.nl</a> <br class="">
+39 3398367372<br class="">
michele.petrins (Skype alias)<br class="">
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