An RDA user noticed that NCL treats GRIB2 files differently. Specifically, for a GRIB2 file that contains u- and v-components of the wind at multiple vertical levels (and where both the u- and v-components are in the same GRIB2 message), if the grid is global, ncl_filedump show variables like this:
109 cheyenne5:DATTORE341712 -> ncl_filedump global.grb2 |grep GRD
float UGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
float VGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
Hi,
An RDA user noticed that NCL treats GRIB2 files differently. Specifically, for a GRIB2 file that contains u- and v-components of the wind at multiple vertical levels (and where both the u- and v-components are in the same GRIB2 message), if the grid is global, ncl_filedump show variables like this: 109 cheyenne5:DATTORE341712 -> ncl_filedump global.grb2 |grep GRD float UGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 ) float VGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 )
but if the grid is a spatial subset of the global grid, the u-component is still okay, but the v-component is broken up into separate variables by vertical level: 111 cheyenne5:DATTORE341713 -> ncl_filedump spatial_subset.grb2 | grep GRD float UGRD_P0_L100_GLL0 ( lv_ISBL0, lat_0, lon_0 ) float VGRD_P0_L100_GLL0 ( lat_0, lon_0 ) float VGRD_P0_L100_GLL1 ( lat_1, lon_1 ) float VGRD_P0_L100_GLL2 ( lat_2, lon_2 ) float VGRD_P0_L100_GLL3 ( lat_3, lon_3 ) float VGRD_P0_L100_GLL4 ( lat_4, lon_4 ) float VGRD_P0_L100_GLL5 ( lat_5, lon_5 ) float VGRD_P0_L100_GLL6 ( lat_6, lon_6 ) float VGRD_P0_L100_GLL7 ( lat_7, lon_7 ) float VGRD_P0_L100_GLL8 ( lat_8, lon_8 ) float VGRD_P0_L100_GLL9 ( lat_9, lon_9 ) float VGRD_P0_L100_GLL10 ( lat_10, lon_10 ) float VGRD_P0_L100_GLL11 ( lat_11, lon_11 ) float VGRD_P0_L100_GLL12 ( lat_12, lon_12 ) float VGRD_P0_L100_GLL13 ( lat_13, lon_13 ) float VGRD_P0_L100_GLL14 ( lat_14, lon_14 ) float VGRD_P0_L100_GLL15 ( lat_15, lon_15 ) float VGRD_P0_L100_GLL16 ( lat_16, lon_16 ) float VGRD_P0_L100_GLL17 ( lat_17, lon_17 ) float VGRD_P0_L100_GLL18 ( lat_18, lon_18 ) float VGRD_P0_L100_GLL19 ( lat_19, lon_19 ) float VGRD_P0_L100_GLL20 ( lat_20, lon_20 ) float VGRD_P0_L100_GLL21 ( lat_21, lon_21 ) float VGRD_P0_L100_GLL22 ( lat_22, lon_22 ) float VGRD_P0_L100_GLL23 ( lat_23, lon_23 ) float VGRD_P0_L100_GLL24 ( lat_24, lon_24 ) float VGRD_P0_L100_GLL25 ( lat_25, lon_25 ) float VGRD_P0_L100_GLL26 ( lat_26, lon_26 ) float VGRD_P0_L100_GLL27 ( lat_27, lon_27 ) float VGRD_P0_L100_GLL28 ( lat_28, lon_28 ) float VGRD_P0_L100_GLL29 ( lat_29, lon_29 ) float VGRD_P0_L100_GLL30 ( lat_30, lon_30 ) float VGRD_P0_L100_GLL31 ( lat_31, lon_31 ) float VGRD_P0_L100_GLL32 ( lat_32, lon_32 ) float VGRD_P0_L100_GLL33 ( lat_33, lon_33 ) float VGRD_P0_L100_GLL34 ( lat_34, lon_34 ) float VGRD_P0_L100_GLL35 ( lat_35, lon_35 ) float VGRD_P0_L100_GLL36 ( lat_36, lon_36 )
Can someone please check this out when you get a chance? If you want me to supply sample files, let me know.
Thanks, Bob