Note
Click here to download the full example code
GridStat: Python Embedding to read and process ice cover
model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover.conf
Scientific Objective
This use case utilizes Python embedding to extract several statistics from the ice cover data over both pole regions, which was already being done in a closed system. By producing the same output via METplus, this use case provides standardization and reproducible results.
Datasets
Forecast: RTOFS ice cover file via Python Embedding script/file
Observation: OSTIA ice cover file via Python Embedding script/file
Location: All of the input data required for this use case can be found in the met_test sample data tarball. Click here to the METplus releases page and download sample data for the appropriate release: https://github.com/dtcenter/METplus/releases
This tarball should be unpacked into the directory that you will set the value of INPUT_BASE. See Running METplus section for more information.
Data Source: JPL’s PODAAC and NCEP’s FTPPRD data servers
External Dependencies
You will need to use a version of Python 3.6+ that has the following packages installed:
scikit-learn
pyproj
pyresample
If the version of Python used to compile MET did not have these libraries at the time of compilation, you will need to add these packages or create a new Python environment with these packages.
If this is the case, you will need to set the MET_PYTHON_EXE environment variable to the path of the version of Python you want to use. If you want this version of Python to only apply to this use case, set it in the [user_env_vars] section of a METplus configuration file.:
[user_env_vars] MET_PYTHON_EXE = /path/to/python/with/required/packages/bin/python
METplus Components
This use case utilizes the METplus GridStat wrapper to generate a command to run the MET tool GridStat with Python Embedding for the specified user hemispheres
METplus Workflow
GridStat is the only tool called in this example. This use case will pass in the two hemispheres via a custom loop list, with both the observation and forecast gridded data being pulled from the files via Python Embedding. All of the desired statistics reside in the CNT line type, so that is the only output requested. It processes the following run time:
Valid: 2021-03-05 0Z
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/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover.conf
# GridStat METplus Configuration
# section heading for [config] variables - all items below this line and
# before the next section heading correspond to the [config] section
[config]
# List of applications to run - only GridStat for this case
PROCESS_LIST = GridStat
# time looping - options are INIT, VALID, RETRO, and REALTIME
# If set to INIT or RETRO:
# INIT_TIME_FMT, INIT_BEG, INIT_END, and INIT_INCREMENT must also be set
# If set to VALID or REALTIME:
# VALID_TIME_FMT, VALID_BEG, VALID_END, and VALID_INCREMENT must also be set
LOOP_BY = VALID
# Format of INIT_BEG and INT_END using % items
# %Y = 4 digit year, %m = 2 digit month, %d = 2 digit day, etc.
# see www.strftime.org for more information
# %Y%m%d%H expands to YYYYMMDDHH
VALID_TIME_FMT = %Y%m%d
# Start time for METplus run - must match INIT_TIME_FMT
VALID_BEG=20210305
# End time for METplus run - must match INIT_TIME_FMT
VALID_END=20210305
# Increment between METplus runs (in seconds if no units are specified)
# Must be >= 60 seconds
VALID_INCREMENT = 1M
# List of forecast leads to process for each run time (init or valid)
# In hours if units are not specified
# If unset, defaults to 0 (don't loop through forecast leads)
LEAD_SEQ = 0
GRID_STAT_CUSTOM_LOOP_LIST = north, south
# Order of loops to process data - Options are times, processes
# Not relevant if only one item is in the PROCESS_LIST
# times = run all wrappers in the PROCESS_LIST for a single run time, then
# increment the run time and run all wrappers again until all times have
# been evaluated.
# processes = run the first wrapper in the PROCESS_LIST for all times
# specified, then repeat for the next item in the PROCESS_LIST until all
# wrappers have been run
LOOP_ORDER = times
# Verbosity of MET output - overrides LOG_VERBOSITY for GridStat only
#LOG_GRID_STAT_VERBOSITY = 2
# Location of MET config file to pass to GridStat
GRID_STAT_CONFIG_FILE = {PARM_BASE}/met_config/GridStatConfig_wrapped
# grid to remap data. Value is set as the 'to_grid' variable in the 'regrid' dictionary
# See MET User's Guide for more information
GRID_STAT_REGRID_TO_GRID = NONE
#GRID_STAT_INTERP_FIELD =
#GRID_STAT_INTERP_VLD_THRESH =
#GRID_STAT_INTERP_SHAPE =
#GRID_STAT_INTERP_TYPE_METHOD =
#GRID_STAT_INTERP_TYPE_WIDTH =
#GRID_STAT_NC_PAIRS_VAR_NAME =
#GRID_STAT_CLIMO_MEAN_TIME_INTERP_METHOD =
#GRID_STAT_CLIMO_STDEV_TIME_INTERP_METHOD =
GRID_STAT_GRID_WEIGHT_FLAG = AREA
# Name to identify model (forecast) data in output
MODEL = RTOFS
# Name to identify observation data in output
OBTYPE = UKMO
# set the desc value in the GridStat MET config file
GRID_STAT_DESC = NA
# List of variables to compare in GridStat - FCST_VAR1 variables correspond
# to OBS_VAR1 variables
# Note [FCST/OBS/BOTH]_GRID_STAT_VAR<n>_NAME can be used instead if different evaluations
# are needed for different tools
# Name of forecast variable 1
FCST_VAR1_NAME = {CONFIG_DIR}/read_ice_data.py {INPUT_BASE}/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover/{valid?fmt=%Y%m%d}_rtofs_glo_2ds_n024_ice.nc {INPUT_BASE}/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover/{valid?fmt=%Y%m%d}12_UKMO_L4.nc {custom} fcst
# List of levels to evaluate for forecast variable 1
# A03 = 3 hour accumulation in GRIB file
FCST_VAR1_LEVELS =
# List of thresholds to evaluate for each name/level combination for
# forecast variable 1
FCST_VAR1_THRESH =
#FCST_GRID_STAT_FILE_TYPE =
# Name of observation variable 1
OBS_VAR1_NAME = {CONFIG_DIR}/read_ice_data.py {INPUT_BASE}/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover/{valid?fmt=%Y%m%d}_rtofs_glo_2ds_n024_ice.nc {INPUT_BASE}/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover/{valid?fmt=%Y%m%d}12_UKMO_L4.nc {custom} obs
# List of levels to evaluate for observation variable 1
# (*,*) is NetCDF notation - must include quotes around these values!
# must be the same length as FCST_VAR1_LEVELS
OBS_VAR1_LEVELS =
# List of thresholds to evaluate for each name/level combination for
# observation variable 1
OBS_VAR1_THRESH =
#GRID_STAT_MET_CONFIG_OVERRIDES = cat_thresh = [>=0.15];
#BOTH_VAR1_THRESH = >=0.15
#OBS_GRID_STAT_FILE_TYPE =
# Time relative to valid time (in seconds) to allow files to be considered
# valid. Set both BEGIN and END to 0 to require the exact time in the filename
# Not used in this example.
FCST_GRID_STAT_FILE_WINDOW_BEGIN = 0
FCST_GRID_STAT_FILE_WINDOW_END = 0
OBS_GRID_STAT_FILE_WINDOW_BEGIN = 0
OBS_GRID_STAT_FILE_WINDOW_END = 0
# MET GridStat neighborhood values
# See the MET User's Guide GridStat section for more information
# width value passed to nbrhd dictionary in the MET config file
GRID_STAT_NEIGHBORHOOD_WIDTH = 1
# shape value passed to nbrhd dictionary in the MET config file
GRID_STAT_NEIGHBORHOOD_SHAPE = SQUARE
# cov thresh list passed to nbrhd dictionary in the MET config file
GRID_STAT_NEIGHBORHOOD_COV_THRESH = >=0.5
# Set to true to run GridStat separately for each field specified
# Set to false to create one run of GridStat per run time that
# includes all fields specified.
GRID_STAT_ONCE_PER_FIELD = False
# Set to true if forecast data is probabilistic
FCST_IS_PROB = false
# Only used if FCST_IS_PROB is true - sets probabilistic threshold
FCST_GRID_STAT_PROB_THRESH = ==0.1
# Set to true if observation data is probabilistic
# Only used if configuring forecast data as the 'OBS' input
OBS_IS_PROB = false
# Only used if OBS_IS_PROB is true - sets probabilistic threshold
OBS_GRID_STAT_PROB_THRESH = ==0.1
GRID_STAT_OUTPUT_PREFIX = {custom}
#GRID_STAT_CLIMO_MEAN_FILE_NAME =
#GRID_STAT_CLIMO_MEAN_FIELD =
#GRID_STAT_CLIMO_MEAN_REGRID_METHOD =
#GRID_STAT_CLIMO_MEAN_REGRID_WIDTH =
#GRID_STAT_CLIMO_MEAN_REGRID_VLD_THRESH =
#GRID_STAT_CLIMO_MEAN_REGRID_SHAPE =
#GRID_STAT_CLIMO_MEAN_TIME_INTERP_METHOD =
#GRID_STAT_CLIMO_MEAN_MATCH_MONTH =
#GRID_STAT_CLIMO_MEAN_DAY_INTERVAL =
#GRID_STAT_CLIMO_MEAN_HOUR_INTERVAL =
#GRID_STAT_CLIMO_STDEV_FILE_NAME =
#GRID_STAT_CLIMO_STDEV_FIELD =
#GRID_STAT_CLIMO_STDEV_REGRID_METHOD =
#GRID_STAT_CLIMO_STDEV_REGRID_WIDTH =
#GRID_STAT_CLIMO_STDEV_REGRID_VLD_THRESH =
#GRID_STAT_CLIMO_STDEV_REGRID_SHAPE =
#GRID_STAT_CLIMO_STDEV_TIME_INTERP_METHOD =
#GRID_STAT_CLIMO_STDEV_MATCH_MONTH =
#GRID_STAT_CLIMO_STDEV_DAY_INTERVAL =
#GRID_STAT_CLIMO_STDEV_HOUR_INTERVAL =
#GRID_STAT_CLIMO_CDF_BINS = 1
#GRID_STAT_CLIMO_CDF_CENTER_BINS = False
#GRID_STAT_CLIMO_CDF_WRITE_BINS = True
#GRID_STAT_OUTPUT_FLAG_FHO = NONE
#GRID_STAT_OUTPUT_FLAG_CTC = NONE
#GRID_STAT_OUTPUT_FLAG_CTS = NONE
#GRID_STAT_OUTPUT_FLAG_MCTC = NONE
#GRID_STAT_OUTPUT_FLAG_MCTS = NONE
GRID_STAT_OUTPUT_FLAG_CNT = BOTH
#GRID_STAT_OUTPUT_FLAG_SL1L2 = NONE
#GRID_STAT_OUTPUT_FLAG_SAL1L2 = NONE
#GRID_STAT_OUTPUT_FLAG_VL1L2 = NONE
#GRID_STAT_OUTPUT_FLAG_VAL1L2 = NONE
#GRID_STAT_OUTPUT_FLAG_VCNT = NONE
#GRID_STAT_OUTPUT_FLAG_PCT = NONE
#GRID_STAT_OUTPUT_FLAG_PSTD = NONE
#GRID_STAT_OUTPUT_FLAG_PJC = NONE
#GRID_STAT_OUTPUT_FLAG_PRC = NONE
#GRID_STAT_OUTPUT_FLAG_ECLV = BOTH
#GRID_STAT_OUTPUT_FLAG_NBRCTC = NONE
#GRID_STAT_OUTPUT_FLAG_NBRCTS = NONE
#GRID_STAT_OUTPUT_FLAG_NBRCNT = NONE
#GRID_STAT_OUTPUT_FLAG_GRAD = BOTH
#GRID_STAT_OUTPUT_FLAG_DMAP = NONE
#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_CLIMO_CDP = FALSE
#GRID_STAT_NC_PAIRS_FLAG_WEIGHT = FALSE
#GRID_STAT_NC_PAIRS_FLAG_NBRHD = FALSE
#GRID_STAT_NC_PAIRS_FLAG_FOURIER = FALSE
#GRID_STAT_NC_PAIRS_FLAG_GRADIENT = FALSE
#GRID_STAT_NC_PAIRS_FLAG_DISTANCE_MAP = FALSE
#GRID_STAT_NC_PAIRS_FLAG_APPLY_MASK = FALSE
# End of [config] section and start of [dir] section
[dir]
#use case configuration file directory
CONFIG_DIR = {PARM_BASE}/use_cases/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover
# directory containing forecast input to GridStat
FCST_GRID_STAT_INPUT_DIR =
# directory containing observation input to GridStat
OBS_GRID_STAT_INPUT_DIR =
# directory containing climatology mean input to GridStat
# Not used in this example
GRID_STAT_CLIMO_MEAN_INPUT_DIR =
# directory containing climatology mean input to GridStat
# Not used in this example
GRID_STAT_CLIMO_STDEV_INPUT_DIR =
# directory to write output from GridStat
GRID_STAT_OUTPUT_DIR = {OUTPUT_BASE}
# End of [dir] section and start of [filename_templates] section
[filename_templates]
# Template to look for forecast input to GridStat relative to FCST_GRID_STAT_INPUT_DIR
FCST_GRID_STAT_INPUT_TEMPLATE = PYTHON_NUMPY
# Template to look for observation input to GridStat relative to OBS_GRID_STAT_INPUT_DIR
OBS_GRID_STAT_INPUT_TEMPLATE = PYTHON_NUMPY
# Optional subdirectories relative to GRID_STAT_OUTPUT_DIR to write output from GridStat
GRID_STAT_OUTPUT_TEMPLATE = {valid?fmt=%Y%m%d}
# Template to look for climatology input to GridStat relative to GRID_STAT_CLIMO_MEAN_INPUT_DIR
# Not used in this example
GRID_STAT_CLIMO_MEAN_INPUT_TEMPLATE =
# Template to look for climatology input to GridStat relative to GRID_STAT_CLIMO_STDEV_INPUT_DIR
# Not used in this example
GRID_STAT_CLIMO_STDEV_INPUT_TEMPLATE =
# Used to specify one or more verification mask files for GridStat
# Not used for this example
GRID_STAT_VERIFICATION_MASK_TEMPLATE =
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}
Python Embedding
This use case uses one Python script to read forecast and observation data
parm/use_cases/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover/read_ice_data.py
#!/bin/env python
"""
Code adapted from
Todd Spindler
NOAA/NWS/NCEP/EMC
Designed to read in RTOFS and OSTIA data
and based on user input, process Arctic or Antarctic regions
for ice cover, and pass back in memory the forecast or observation
data field
"""
import numpy as np
from sklearn.metrics import mean_squared_error
import xarray as xr
import pandas as pd
from pyproj import Geod
import pyresample as pyr
from datetime import datetime, date
import os, sys
#-------------------------------------
def iceArea(lon1,lat1,ice1):
"""
Compute the cell side dimensions (Vincenty) and the cell surface areas.
This assumes the ice has already been masked and subsampled as needed
returns ice_extent, ice_area, surface_area = iceArea(lon,lat,ice)
surface_area is the computed grid areas in km**2)
"""
lon=lon1.copy()
lat=lat1.copy()
ice=ice1.copy()
g=Geod(ellps='WGS84')
_,_,xdist=g.inv(lon,lat,np.roll(lon,-1,axis=1),np.roll(lat,-1,axis=1))
_,_,ydist=g.inv(lon,lat,np.roll(lon,-1,axis=0),np.roll(lat,-1,axis=0))
xdist=np.ma.array(xdist,mask=ice.mask)/1000.
ydist=np.ma.array(ydist,mask=ice.mask)/1000.
xdist=xdist[:-1,:-1]
ydist=ydist[:-1,:-1]
ice=ice[:-1,:-1] # just to match the roll
extent=xdist*ydist # extent is surface area only
area=xdist*ydist*ice # ice area is actual ice cover (area * concentration)
return extent.flatten().sum(), area.flatten().sum(), extent
#--------------------------------------------------------
try:
rtofsfile, icefile, hemisphere, file_flag = sys.argv[1:]
except ValueError:
print("Must specify the following elements: fcst_file obs_file hemisphere file_flag")
sys.exit(1)
HEMISPHERES = ['north', 'south']
FILE_FLAGS = ['fcst', 'obs']
if hemisphere not in HEMISPHERES or file_flag not in FILE_FLAGS:
print(f"ERROR: Invalid hemisphere value ({hemisphere}) or file_flag value ({file_flag}) "
f"Valid options are {HEMISPHERES} {FILE_FLAGS}")
sys.exit(1)
print('processing',hemisphere+'ern hemisphere')
if hemisphere == 'north':
bounding_lat=30.98
else:
bounding_lat=-39.23
# load rtofs data and subset to hemisphere of interest and ice cover min value
print('reading rtofs ice')
if not os.path.exists(rtofsfile):
print('missing rtofs file',rtofsfile)
sys.exit(1)
rtofs=xr.open_dataset(rtofsfile,decode_times=True)
rtofs=rtofs.ice_coverage[0,:-1,]
# load OSTIA data
print('reading OSTIA ice')
if not os.path.exists(icefile):
print('missing OSTIA ice file',icefile)
sys.exit(1)
ncep=xr.open_dataset(icefile,decode_times=True)
ncep=ncep.rename({'lon':'Longitude','lat':'Latitude'})
ncep=ncep.sea_ice_fraction.squeeze()
# trim to polar regions
if hemisphere == 'north':
rtofs=rtofs.where((rtofs.Latitude>=bounding_lat),drop=True)
ncep=ncep.where((ncep.Latitude>=bounding_lat),drop=True)
else:
rtofs=rtofs.where((rtofs.Latitude<=bounding_lat),drop=True)
ncep=ncep.where((ncep.Latitude<=bounding_lat),drop=True)
# now it's back to masked arrays for the RTOFS data
rlon=rtofs.Longitude.values
rlat=rtofs.Latitude.values
rice=rtofs.to_masked_array()
nlon=ncep.Longitude.values%360. # shift from -180 - 180 to 0-360
nlat=ncep.Latitude.values
nlon,nlat=np.meshgrid(nlon,nlat) # shift from 1-d to 2-d arrays
nice=ncep.to_masked_array()
# mask out values below 15%
rice.mask=np.ma.mask_or(rice.mask,rice<0.15)
nice.mask=np.ma.mask_or(nice.mask,nice<0.15)
# compute ice area on original grids
print('computing ice area')
ncep_extent,ncep_area,ncep_surface_area=iceArea(nlon,nlat,nice)
rtofs_extent,rtofs_area,rtofs_surface_area=iceArea(rlon,rlat,rice)
# interpolate rtofs to ncep grid
print('interpolating rtofs to OSTIA grid')
# pyresample gausssian-weighted kd-tree interp
rlon1=pyr.utils.wrap_longitudes(rlon)
rlat1=rlat.copy()
nlon1=pyr.utils.wrap_longitudes(nlon)
nlat1=nlat.copy()
# define the grids
orig_def = pyr.geometry.GridDefinition(lons=rlon1,lats=rlat1)
targ_def = pyr.geometry.GridDefinition(lons=nlon1,lats=nlat1)
radius=50000
sigmas=25000
rice2=pyr.kd_tree.resample_gauss(orig_def,rice,targ_def,
radius_of_influence=radius,
sigmas=sigmas,
nprocs=8,
neighbours=8,
fill_value=None)
print('creating combined mask')
combined_mask=np.logical_and(nice.mask,rice2.mask)
nice2=nice.filled(fill_value=0.0)
rice2=rice2.filled(fill_value=0.0)
nice2=np.ma.array(nice2,mask=combined_mask)
rice2=np.ma.array(rice2,mask=combined_mask)
#Create the MET grids based on the file_flag
if file_flag == 'fcst':
met_data = rice2[:-1,:-1]
met_data = met_data[::-1,]
#trim the lat/lon grids so they match the data fields
#note that nice1 lat/lon fields are valid, since rice2 is interpolated to nice2
lat_met = nlat1[:-1,:-1]
lon_met = nlon1[:-1,:-1]
print("Data shape: "+repr(met_data.shape))
v_str = rtofsfile.split('_')[-6].split('/')[-1]
v_str = v_str + '_120000'
lat_ll = float(lat_met.min())
lon_ll = float(lon_met.min())
n_lat = lat_met.shape[0]
n_lon = lon_met.shape[1]
delta_lat = (float(lat_met.max()) - float(lat_met.min()))/float(n_lat)
delta_lon = (float(lon_met.max()) - float(lon_met.min()))/float(n_lon)
print(f"variables:"
f"lat_ll: {lat_ll} lon_ll: {lon_ll} n_lat: {n_lat} n_lon: {n_lon} delta_lat: {delta_lat} delta_lon: {delta_lon}")
met_data.attrs = {
'valid': v_str,
'init': v_str,
'lead': "00",
'accum': "00",
'name': 'ice_coverage',
'standard_name': rtofs.standard_name,
'long_name': rtofs.long_name.strip(),
'level': "SURFACE",
'units': "UNKNOWN",
'grid': {
'type': "LatLon",
'name': "RTOFS Grid",
'lat_ll': lat_ll,
'lon_ll': lon_ll,
'delta_lat': delta_lat,
'delta_lon': delta_lon,
'Nlat': n_lat,
'Nlon': n_lon,
}
}
attrs = met_data.attrs
if file_flag == 'obs':
met_data = nice2[:-1,:-1]
met_data = met_data[::-1,]
#modify the lat and lon grids since they need to match the data dimensions, and code cuts the last row/column of data
lat_met = nlat1[:-1,:-1]
lon_met = nlon1[:-1,:-1]
print("Data shape: " +repr(met_data.shape))
v_str = icefile.split('_')[-3].split('/')[-1]
v_str = v_str[:-2]+'_120000'
lat_ll = float(lat_met.min())
lon_ll = float(lon_met.min())
n_lat = lat_met.shape[0]
n_lon = lon_met.shape[1]
delta_lat = (float(lat_met.max()) - float(lat_met.min()))/float(n_lat)
delta_lon = (float(lon_met.max()) - float(lon_met.min()))/float(n_lon)
print(f"variables:"
f"lat_ll: {lat_ll} lon_ll: {lon_ll} n_lat: {n_lat} n_lon: {n_lon} delta_lat: {delta_lat} delta_lon: {delta_lon}")
met_data.attrs = {
'valid': v_str,
'init': v_str,
'lead': "00",
'accum': "00",
'name': 'ice_coverage',
'standard_name': ncep.standard_name,
'long_name': ncep.long_name.strip(),
'level': "SURFACE",
'units': "UNKNOWN",
'grid': {
'type': "LatLon",
'name': "RTOFS Grid",
'lat_ll': lat_ll,
'lon_ll': lon_ll,
'delta_lat': delta_lat,
'delta_lon': delta_lon,
'Nlat': n_lat,
'Nlon': n_lon,
}
}
attrs = met_data.attrs
Running METplus
This use case can be run two ways:
Passing in GridStat_fcstRTOFS_obsOSTIA_iceCover.conf then a user-specific system configuration file:
run_metplus.py -c /path/to/METplus/parm/use_cases/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover.conf -c /path/to/user_system.conf
Modifying the configurations in parm/metplus_config, then passing in GridStat_fcstRTOFS_obsOSTIA_iceCover.conf:
run_metplus.py -c /path/to/METplus/parm/use_cases/model_applications/marine_and_cryosphere/GridStat_fcstRTOFS_obsOSTIA_iceCover.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 thisIce use case will be found in 20210305 (relative to OUTPUT_BASE) and will contain the following files:
grid_stat_north_000000L_20210305_120000V_cnt.txt
grid_stat_south_000000L_20210305_120000V_cnt.txt
grid_stat_north_000000L_20210305_120000V.stat
grid_stat_south_000000L_20210305_120000V.stat
Keywords
Note
GridStatToolUseCase
PythonEmbeddingFileUseCase
MarineAndCryosphereAppUseCase
Navigate to the METplus Quick Search for Use Cases page to discover other similar use cases.
sphinx_gallery_thumbnail_path = ‘_static/marine_and_cryosphere-GridStat_fcstRTOFS_obsOSTIA_iceCover.png’
Total running time of the script: ( 0 minutes 0.000 seconds)