Note
Click here to download the full example code
Grid-Stat: 6hr QPF in GEMPAK format
model_applications/precipitation/GridStat_fcstHREFmean _obsStgIV_Gempak.conf
Scientific Objective
Evaluate the skill of a high resolution multi-model ensemble mean at predicting 6 hour precipitation accumulation using the NCEP Stage IV gauge corrected analysis.
Datasets
Relevant information about the datasets that would be beneficial include:
Forecast dataset: HREF mean forecasts in Gempak
Observation dataset: Stage IV GRIB 6 hour precipitation accumulation
Sources of data (links, contacts, etc…)
External Dependencies
GempakToCF.jar
GempakToCF is an external tool that utilizes the Unidata NetCDF-Java package. The jar file that can be used to run the utility is available here: https://dtcenter.org/sites/default/files/community-code/metplus/utilities/GempakToCF.jar
To enable Gempak support, you must set [exe] GEMPAKTOCF_JAR in your user METplus configuration file:
[exe] GEMPAKTOCF_JAR = /path/to/GempakToCF.jar
See the GempakToCF use case for more information:
parm/use_cases/met_tool_wrapper/GempakToCF/GempakToCF.conf
More information on the package used to create the file is here: https://www.unidata.ucar.edu/software/netcdf-java
METplus Components
This use case first runs PCPCombine on the forecast data to build a 6 hour precipitation accumulation from 1 hour files or a single 6 hour file. Then the observation data is regridded to the model grid using the RegridDataPlane. Finally, the observation files are compared to the forecast data using GridStat.
METplus Workflow
The following tools are used for each run time:
PCPCombine (observation) > RegridDataPlane (observation) > GridStat
This example loops by initialization time. There is only one initalization time in this example so the following will be run:
Run times:
METplus Configuration
METplus first loads all of the configuration files found in parm/metplus_config, then it loads any configuration files passed to METplus via the command line with the -c option, i.e. -c parm/use_cases/model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak.conf
[config]
PROCESS_LIST = PCPCombine, RegridDataPlane, GridStat
LOOP_BY = INIT
INIT_TIME_FMT = %Y%m%d%H
INIT_BEG=2017050912
INIT_END=2017050912
INIT_INCREMENT=43200
LEAD_SEQ = 18
LOOP_ORDER = times
FCST_PCP_COMBINE_RUN = True
FCST_PCP_COMBINE_METHOD = ADD
FCST_PCP_COMBINE_INPUT_DIR = {INPUT_BASE}/model_applications/precipitation/HREFv2_Mean_Gempak
FCST_PCP_COMBINE_INPUT_TEMPLATE = {init?fmt=%Y%m%d}/hrefmean_{init?fmt=%Y%m%d%H}f{lead?fmt=%HHH}.grd
FCST_PCP_COMBINE_OUTPUT_DIR = {OUTPUT_BASE}/model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak/HREFv2_Mean/bucket
FCST_PCP_COMBINE_OUTPUT_TEMPLATE = {valid?fmt=%Y%m%d}/hrefmean_{valid?fmt=%Y%m%d%H}_A{level?fmt=%HH}.nc
OBS_REGRID_DATA_PLANE_RUN = True
OBS_REGRID_DATA_PLANE_INPUT_DIR = {INPUT_BASE}/model_applications/precipitation/StageIV
OBS_REGRID_DATA_PLANE_INPUT_TEMPLATE = {valid?fmt=%Y%m%d?shift=-12H}12_st4.nc
OBS_REGRID_DATA_PLANE_OUTPUT_DIR = {OUTPUT_BASE}/model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak/StageIV_gempak/regrid
OBS_REGRID_DATA_PLANE_OUTPUT_TEMPLATE = {valid?fmt=%Y%m%d%H}_st4_A06.nc
FCST_GRID_STAT_INPUT_DIR = {FCST_PCP_COMBINE_OUTPUT_DIR}
FCST_GRID_STAT_INPUT_TEMPLATE = {valid?fmt=%Y%m%d}/hrefmean_{valid?fmt=%Y%m%d%H}_A{level?fmt=%HH}.nc
OBS_GRID_STAT_INPUT_DIR = {OBS_REGRID_DATA_PLANE_OUTPUT_DIR}
OBS_GRID_STAT_INPUT_TEMPLATE = {OBS_REGRID_DATA_PLANE_OUTPUT_TEMPLATE}
GRID_STAT_OUTPUT_DIR = {OUTPUT_BASE}/model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak/GridStat
GRID_STAT_OUTPUT_TEMPLATE = {init?fmt=%Y%m%d%H%M}
MODEL = HREF_MEAN
OBTYPE = STAGE4
FCST_VAR1_NAME = APCP
FCST_VAR1_LEVELS = A06
FCST_VAR1_THRESH = gt12.7, gt25.4, gt50.8, gt76.2, gt152.4
OBS_VAR1_NAME = P06M_NONE
OBS_VAR1_LEVELS = "(*,*)"
OBS_VAR1_THRESH = gt12.7, gt25.4, gt50.8, gt76.2, gt152.4
FCST_PCP_COMBINE_INPUT_DATATYPE = GEMPAK
FCST_IS_PROB = false
FCST_PCP_COMBINE_CONSTANT_INIT = true
FCST_PCP_COMBINE_INPUT_ACCUMS = 1
FCST_PCP_COMBINE_INPUT_NAMES = P01M_NONE
FCST_PCP_COMBINE_INPUT_LEVELS = "(0,*,*)"
REGRID_DATA_PLANE_METHOD = BUDGET
REGRID_DATA_PLANE_WIDTH = 2
REGRID_DATA_PLANE_VERIF_GRID={INPUT_BASE}/model_applications/precipitation/mask/CONUS_HRRRTLE.nc
OBS_REGRID_DATA_PLANE_VAR1_INPUT_LEVEL = "({valid?fmt=%Y%m%d_%H%M%S},*,*)"
OBS_PCP_COMBINE_INPUT_DATATYPE = NETCDF
GRID_STAT_CONFIG_FILE = {PARM_BASE}/met_config/GridStatConfig_wrapped
GRID_STAT_REGRID_TO_GRID = OBS
GRID_STAT_NEIGHBORHOOD_WIDTH = 3, 7, 15
GRID_STAT_NEIGHBORHOOD_SHAPE = SQUARE
GRID_STAT_NEIGHBORHOOD_COV_THRESH = >=0.5
GRID_STAT_OUTPUT_FLAG_CTC = STAT
GRID_STAT_OUTPUT_FLAG_CTS = STAT
GRID_STAT_OUTPUT_FLAG_DMAP = STAT
GRID_STAT_NC_PAIRS_FLAG_LATLON = FALSE
GRID_STAT_NC_PAIRS_FLAG_RAW = FALSE
GRID_STAT_NC_PAIRS_FLAG_DIFF = FALSE
GRID_STAT_NC_PAIRS_FLAG_CLIMO = FALSE
GRID_STAT_NC_PAIRS_FLAG_APPLY_MASK = FALSE
GRID_STAT_NC_PAIRS_FLAG_DISTANCE_MAP = TRUE
MET Configuration
METplus sets environment variables based on user settings in the METplus configuration file. See How METplus controls MET config file settings for more details.
YOU SHOULD NOT SET ANY OF THESE ENVIRONMENT VARIABLES YOURSELF! THEY WILL BE OVERWRITTEN BY METPLUS WHEN IT CALLS THE MET TOOLS!
If there is a setting in the MET configuration file that is currently not supported by METplus you’d like to control, please refer to: Overriding Unsupported MET config file settings
Note
See the GridStat MET Configuration section of the User’s Guide for more information on the environment variables used in the file below:
////////////////////////////////////////////////////////////////////////////////
//
// Grid-Stat configuration file.
//
// For additional information, see the MET_BASE/config/README file.
//
////////////////////////////////////////////////////////////////////////////////
//
// Output model name to be written
//
// model =
${METPLUS_MODEL}
//
// Output description to be written
// May be set separately in each "obs.field" entry
//
// desc =
${METPLUS_DESC}
//
// Output observation type to be written
//
// obtype =
${METPLUS_OBTYPE}
////////////////////////////////////////////////////////////////////////////////
//
// Verification grid
//
// regrid = {
${METPLUS_REGRID_DICT}
////////////////////////////////////////////////////////////////////////////////
//censor_thresh =
${METPLUS_CENSOR_THRESH}
//censor_val =
${METPLUS_CENSOR_VAL}
cat_thresh = [];
cnt_thresh = [ NA ];
cnt_logic = UNION;
wind_thresh = [ NA ];
wind_logic = UNION;
eclv_points = 0.05;
//nc_pairs_var_name =
${METPLUS_NC_PAIRS_VAR_NAME}
nc_pairs_var_suffix = "";
//hss_ec_value =
${METPLUS_HSS_EC_VALUE}
rank_corr_flag = FALSE;
//
// Forecast and observation fields to be verified
//
fcst = {
${METPLUS_FCST_FILE_TYPE}
${METPLUS_FCST_FIELD}
}
obs = {
${METPLUS_OBS_FILE_TYPE}
${METPLUS_OBS_FIELD}
}
////////////////////////////////////////////////////////////////////////////////
//
// Climatology mean data
//
//climo_mean = {
${METPLUS_CLIMO_MEAN_DICT}
//climo_stdev = {
${METPLUS_CLIMO_STDEV_DICT}
//
// May be set separately in each "obs.field" entry
//
//climo_cdf = {
${METPLUS_CLIMO_CDF_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Verification masking regions
//
// mask = {
${METPLUS_MASK_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Confidence interval settings
//
ci_alpha = [ 0.05 ];
boot = {
interval = PCTILE;
rep_prop = 1.0;
n_rep = 0;
rng = "mt19937";
seed = "";
}
////////////////////////////////////////////////////////////////////////////////
//
// Data smoothing methods
//
//interp = {
${METPLUS_INTERP_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Neighborhood methods
//
nbrhd = {
field = BOTH;
// shape =
${METPLUS_NBRHD_SHAPE}
// width =
${METPLUS_NBRHD_WIDTH}
// cov_thresh =
${METPLUS_NBRHD_COV_THRESH}
vld_thresh = 1.0;
}
////////////////////////////////////////////////////////////////////////////////
//
// Fourier decomposition
// May be set separately in each "obs.field" entry
//
//fourier = {
${METPLUS_FOURIER_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Gradient statistics
// May be set separately in each "obs.field" entry
//
gradient = {
dx = [ 1 ];
dy = [ 1 ];
}
////////////////////////////////////////////////////////////////////////////////
//
// Distance Map statistics
// May be set separately in each "obs.field" entry
//
//distance_map = {
${METPLUS_DISTANCE_MAP_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Statistical output types
//
//output_flag = {
${METPLUS_OUTPUT_FLAG_DICT}
//
// NetCDF matched pairs output file
// May be set separately in each "obs.field" entry
//
// nc_pairs_flag = {
${METPLUS_NC_PAIRS_FLAG_DICT}
////////////////////////////////////////////////////////////////////////////////
//grid_weight_flag =
${METPLUS_GRID_WEIGHT_FLAG}
tmp_dir = "${MET_TMP_DIR}";
// output_prefix =
${METPLUS_OUTPUT_PREFIX}
////////////////////////////////////////////////////////////////////////////////
${METPLUS_MET_CONFIG_OVERRIDES}
Running METplus
This use case can be run two ways:
Passing in GridStat_fcstHREFmean_obsStgIV_Gempak.conf then a user-specific system configuration file:
run_metplus.py -c /path/to/METplus/parm/use_cases/model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak.conf -c /path/to/user_system.conf
Modifying the configurations in parm/metplus_config, then passing in GridStat_fcstHREFmean_obsStgIV_Gempak.conf:
run_metplus.py -c /path/to/METplus/parm/use_cases/model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak.conf
The former method is recommended. Whether you add them to a user-specific configuration file or modify the metplus_config files, the following variables must be set correctly:
INPUT_BASE - Path to directory where sample data tarballs are unpacked (See Datasets section to obtain tarballs). This is not required to run METplus, but it is required to run the examples in parm/use_cases
OUTPUT_BASE - Path where METplus output will be written. This must be in a location where you have write permissions
MET_INSTALL_DIR - Path to location where MET is installed locally
Example User Configuration File:
[dir]
INPUT_BASE = /path/to/sample/input/data
OUTPUT_BASE = /path/to/output/dir
MET_INSTALL_DIR = /path/to/met-X.Y
NOTE: All of these items must be found under the [dir] section.
Expected Output
A successful run will output the following both to the screen and to the logfile:
INFO: METplus has successfully finished running.
Refer to the value set for OUTPUT_BASE to find where the output data was generated. Output for this use case will be found in model_applications/precipitation/GridStat_fcstHREFmean_obsStgIV_Gempak/GridStat/201705091200 (relative to OUTPUT_BASE) and will contain the following files:
grid_stat_000000L_20170510_060000V_eclv.txt
grid_stat_000000L_20170510_060000V_grad.txt
grid_stat_000000L_20170510_060000V.stat
Keywords
Note
GridStatToolUseCase
PrecipitationAppUseCase
PCPCombineToolUseCase
RegridDataPlaneToolUseCase
GEMPAKFileUseCase
NetCDFFileUseCase
NOAAWPCOrgUseCase
NOAAHMTOrgUseCase
NOAAHWTOrgUseCase
ConvectionAllowingModelsAppUseCase
Navigate to the METplus Quick Search for Use Cases page to discover other similar use cases.
sphinx_gallery_thumbnail_path = ‘_static/precipitation-GridStat_fcstHREFmean_obsStgIV_Gempak.png’
Total running time of the script: ( 0 minutes 0.000 seconds)