# This software is open source software available under the BSD-3 license.
#
# Copyright (c) 2022 Triad National Security, LLC. All rights reserved.
# Copyright (c) 2022 Lawrence Livermore National Security, LLC. All rights
# reserved.
# Copyright (c) 2022 UT-Battelle, LLC. All rights reserved.
#
# Additional copyright and license information can be found in the LICENSE file
# distributed with this code, or at
# https://raw.githubusercontent.com/MPAS-Dev/MPAS-Analysis/master/LICENSE
"""
Utility functions related to time-series data sets
"""
# Authors
# -------
# Xylar Asay-Davis
import xarray as xr
import numpy
import os
from distutils.spawn import find_executable
import glob
import subprocess
from mpas_analysis.shared.timekeeping.utility import days_to_datetime
def combine_time_series_with_ncrcat(inFileNames, outFileName,
variableList=None, logger=None):
"""
Uses ncrcat to extact time series from a series of files
inFileNames : str or list of str
A file name with wildcard(s) or a list of input files from which to
extract the time series.
outFileName : str
The output NetCDF file where the time series should be written.
variableList : list of str, optional
A list of varibles to include. All variables are included by default
logger : `logging.Logger``, optional
A logger to which ncclimo output should be redirected
Raises
------
OSError
If ``ncrcat`` is not in the system path.
Author
------
Xylar Asay-Davis
"""
if find_executable('ncrcat') is None:
raise OSError('ncrcat not found. Make sure the latest nco '
'package is installed: \n'
'conda install nco\n'
'Note: this presumes use of the conda-forge '
'channel.')
if os.path.exists(outFileName):
return
if isinstance(inFileNames, str):
inFileNames = sorted(glob.glob(inFileNames))
args = ['ncrcat', '-4', '--record_append', '--no_tmp_fl']
if variableList is not None:
args.extend(['-v', ','.join(variableList)])
printCommand = '{} {} ... {} {}'.format(' '.join(args), inFileNames[0],
inFileNames[-1],
outFileName)
args.extend(inFileNames)
args.append(outFileName)
if logger is None:
print('running: {}'.format(printCommand))
else:
logger.info('running: {}'.format(printCommand))
for handler in logger.handlers:
handler.flush()
process = subprocess.Popen(args, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
if stdout:
stdout = stdout.decode('utf-8')
for line in stdout.split('\n'):
if logger is None:
print(line)
else:
logger.info(line)
if stderr:
stderr = stderr.decode('utf-8')
for line in stderr.split('\n'):
if logger is None:
print(line)
else:
logger.error(line)
if process.returncode != 0:
raise subprocess.CalledProcessError(process.returncode,
' '.join(args))
[docs]def cache_time_series(timesInDataSet, timeSeriesCalcFunction, cacheFileName,
calendar, yearsPerCacheUpdate=1,
logger=None):
"""
Create or update a NetCDF file ``cacheFileName`` containing the given time
series, calculated with ``timeSeriesCalcFunction`` over the given times,
start and end year, and time frequency with which results are cached.
Note: only works with climatologies where the mask (locations of ``NaN``
values) doesn't vary with time.
Parameters
----------
timesInDataSet : array-like
Times at which the time series is to be calculated, typically taken
from ``ds.Times.values`` for a data set from which the time series
will be extracted or computed.
timeSeriesCalcFunction : function
A function with arguments ``timeIndices``, indicating the entries in
``timesInDataSet`` to be computed, and ``firstCall``, indicating
whether this is the first call to the funciton (useful for printing
progress information).
cacheFileName : str
The absolute path to the cache file where the times series will be
stored
calendar : {'gregorian', 'noleap'}
The name of one of the calendars supported by MPAS cores, used to
determine ``year`` and ``month`` from ``Time`` coordinate
yearsPerCacheUpdate : int, optional
The frequency with which the cache file is updated as the computation
progresses. If the computation is expensive, it may be useful to
output the file frequently. If not, there will be needless overhead
in caching the file too frequently.
logger : ``logging.Logger``, optional
A logger to which to write output as the time series is computed
Returns
-------
climatology : object of same type as ``ds``
A data set without the ``'Time'`` coordinate containing the mean
of ds over all months in monthValues, weighted by the number of days
in each month.
"""
# Authors
# -------
# Xylar Asay-Davis
timesProcessed = numpy.zeros(len(timesInDataSet), bool)
# figure out which files to load and which years go in each file
continueOutput = os.path.exists(cacheFileName)
cacheDataSetExists = False
if continueOutput:
if logger is not None:
logger.info(' Read in previously computed time series')
# read in what we have so far
try:
dsCache = xr.open_dataset(cacheFileName, decode_times=False)
cacheDataSetExists = True
except IOError:
# assuming the cache file is corrupt, so deleting it.
message = 'Deleting cache file {}, which appears to have ' \
'been corrupted.'.format(cacheFileName)
if logger is None:
print('Warning: {}'.format(message))
else:
logger.warning(message)
os.remove(cacheFileName)
if cacheDataSetExists:
# force loading and then close so we can overwrite the file later
dsCache.load()
dsCache.close()
for time in dsCache.Time.values:
timesProcessed[timesInDataSet == time] = True
datetimes = days_to_datetime(timesInDataSet, calendar=calendar)
yearsInDataSet = numpy.array([date.year for date in datetimes])
startYear = yearsInDataSet[0]
endYear = yearsInDataSet[-1]
firstProcessed = True
for firstYear in range(startYear, endYear + 1, yearsPerCacheUpdate):
years = range(firstYear, numpy.minimum(endYear + 1,
firstYear + yearsPerCacheUpdate))
mask = numpy.zeros(len(yearsInDataSet), bool)
for year in years:
mask = numpy.logical_or(mask, yearsInDataSet == year)
mask = numpy.logical_and(mask, numpy.logical_not(timesProcessed))
timeIndices = numpy.nonzero(mask)[0]
if len(timeIndices) == 0:
# no unprocessed time entries in this data range
continue
if logger is not None:
if firstProcessed:
logger.info(' Process and save time series')
if yearsPerCacheUpdate == 1:
logger.info(' {:04d}'.format(years[0]))
else:
logger.info(' {:04d}-{:04d}'.format(years[0], years[-1]))
ds = timeSeriesCalcFunction(timeIndices, firstProcessed)
firstProcessed = False
if cacheDataSetExists:
dsCache = xr.concat([dsCache, ds], dim='Time')
# now sort the Time dimension:
dsCache = dsCache.loc[{'Time': sorted(dsCache.Time.values)}]
else:
dsCache = ds
cacheDataSetExists = True
dsCache.to_netcdf(cacheFileName)
return dsCache.sel(Time=slice(timesInDataSet[0], timesInDataSet[-1]))