rads_adt2ioda.py

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#!/usr/bin/env python3
 
#
# (C) Copyright 2019 UCAR
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
 
from __future__ import print_function
import sys
import argparse
import netCDF4 as nc
from datetime import datetime, timedelta
import dateutil.parser
from pathlib import Path
 
IODA_CONV_PATH = Path(__file__).parent/"@SCRIPT_LIB_PATH@"
if not IODA_CONV_PATH.is_dir():
    IODA_CONV_PATH = Path(__file__).parent/'..'/'lib-python'
sys.path.append(str(IODA_CONV_PATH.resolve()))
 
import ioda_conv_ncio as iconv
from orddicts import DefaultOrderedDict
 
 
class Observation(object):
 
    def __init__(self, filename, date, writer):
 
        self.filenamefilename = filename
        self.datedate = date
        self.datadata = DefaultOrderedDict(lambda: DefaultOrderedDict(dict))
        self.writerwriter = writer
        self._read_read()
 
    def _read(self):
 
        ncd = nc.MFDataset(self.filenamefilename)
        time = ncd.variables['time_mjd'][:]
        lons = ncd.variables['lon'][:]
        lats = ncd.variables['lat'][:]
        vals = ncd.variables['adt_xgm2016'][:]
        units = ncd.variables['time_mjd'].units[-23:-4]
        reftime = dateutil.parser.parse(units)
        ncd.close()
 
        valKey = vName, self.writerwriter.OvalName()
        errKey = vName, self.writerwriter.OerrName()
        qcKey = vName, self.writerwriter.OqcName()
 
        count = 0
        for i in range(len(lons)):
 
            count += 1
            obs_date = reftime + timedelta(days=time[i])
 
            locKey = lats[i], lons[i], obs_date.strftime("%Y-%m-%dT%H:%M:%SZ")
            self.datadata[0][locKey][valKey] = vals[i]
            self.datadata[0][locKey][errKey] = 0.1
            self.datadata[0][locKey][qcKey] = 0
 
 
vName = "obs_absolute_dynamic_topography"
 
locationKeyList = [
    ("latitude", "float"),
    ("longitude", "float"),
    ("datetime", "string")
]
 
AttrData = {
    'odb_version': 1,
}
 
 
def main():
 
    # Get command line arguments
    parser = argparse.ArgumentParser(
        description=(
            'Reads absolute dynamic topography (ADT) observations'
            ' from NESDIS file(s) and converts into IODA formatted'
            ' output files')
    )
 
    required = parser.add_argument_group(title='required arguments')
    required.add_argument(
        '-i', '--input',
        help="RADS observation input file(s)",
        type=str, nargs='+', required=True)
    required.add_argument(
        '-o', '--output',
        help="path of ioda output file",
        type=str, required=True)
    required.add_argument(
        '-d', '--date',
        help="base date for the center of the window",
        metavar="YYYYMMDDHH", type=str, required=True)
 
    args = parser.parse_args()
    fdate = datetime.strptime(args.date, '%Y%m%d%H')
    writer = iconv.NcWriter(args.output, locationKeyList)
 
    # Read in the altimeter
    altim = Observation(args.input, fdate, writer)
 
    # write them out
    AttrData['date_time_string'] = fdate.strftime("%Y-%m-%dT%H:%M:%SZ")
 
    (ObsVars, LocMdata, VarMdata) = writer.ExtractObsData(altim.data)
    writer.BuildNetcdf(ObsVars, LocMdata, VarMdata, AttrData)
 
 
if __name__ == '__main__':
    main()