mirror of https://github.com/ecmwf/eccodes.git
119 lines
3.4 KiB
Python
119 lines
3.4 KiB
Python
# Copyright 2005-2017 ECMWF.
|
|
#
|
|
# 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.
|
|
#
|
|
# In applying this licence, ECMWF does not waive the privileges and immunities
|
|
# granted to it by virtue of its status as an intergovernmental organisation
|
|
# nor does it submit to any jurisdiction.
|
|
|
|
#
|
|
# Python implementation: bufr_attributes
|
|
#
|
|
# Description: how to read attributes of keys in BUFR messages.
|
|
#
|
|
#
|
|
|
|
import traceback
|
|
import sys
|
|
|
|
from eccodes import *
|
|
|
|
INPUT = '../../data/bufr/syno_multi.bufr'
|
|
VERBOSE = 1 # verbose error reporting
|
|
|
|
|
|
def example():
|
|
|
|
# open bufr file
|
|
f = open(INPUT)
|
|
|
|
cnt = 0
|
|
|
|
# define the attributes to be printed (see BUFR code table B)
|
|
attrs = [
|
|
'code',
|
|
'units',
|
|
'scale',
|
|
'reference',
|
|
'width'
|
|
]
|
|
|
|
# loop for the messages in the file
|
|
while 1:
|
|
# get handle for message
|
|
bufr = codes_bufr_new_from_file(f)
|
|
if bufr is None:
|
|
break
|
|
|
|
print "message: %s" % cnt
|
|
|
|
# we need to instruct ecCodes to expand all the descriptors
|
|
# i.e. unpack the data values
|
|
codes_set(bufr, 'unpack', 1)
|
|
|
|
# --------------------------------------------------------------
|
|
# We will read the value and all the attributes available for
|
|
# the 2m temperature.
|
|
# --------------------------------------------------------------
|
|
# get the value
|
|
key = 'airTemperatureAt2M'
|
|
try:
|
|
print ' %s: %s' % (key, codes_get(bufr, key))
|
|
except CodesInternalError as err:
|
|
print 'Error with key="%s" : %s' % (key, err.msg)
|
|
|
|
# print the values of the attributes of the key. Attributes themselves
|
|
# are keys as well. Their name is constructed like:
|
|
# keyname->attributename
|
|
for attr in attrs:
|
|
key = 'airTemperatureAt2M' + "->" + attr
|
|
try:
|
|
print ' %s: %s' % (key, codes_get(bufr, key))
|
|
except CodesInternalError as err:
|
|
print 'Error with key="%s" : %s' % (key, err.msg)
|
|
|
|
# ------------------------------------------------------------------
|
|
# The 2m temperature data element in this message has an associated
|
|
# field: percentConfidence. Its value and attributes can be accessed
|
|
# in a similar manner as was shown above for 2m temperature.
|
|
# ------------------------------------------------------------------
|
|
|
|
# get the value
|
|
key = 'airTemperatureAt2M->percentConfidence'
|
|
try:
|
|
print ' %s: %s' % (key, codes_get(bufr, key))
|
|
except CodesInternalError as err:
|
|
print 'Error with key="%s" : %s' % (key, err.msg)
|
|
|
|
# print the values of the attributes of the key.
|
|
for attr in attrs:
|
|
key = 'airTemperatureAt2M->percentConfidence' + "->" + attr
|
|
try:
|
|
print ' %s: %s' % (key, codes_get(bufr, key))
|
|
except CodesInternalError as err:
|
|
print 'Error with key="%s" : %s' % (key, err.msg)
|
|
|
|
cnt += 1
|
|
|
|
# delete handle
|
|
codes_release(bufr)
|
|
|
|
# close the file
|
|
f.close()
|
|
|
|
|
|
def main():
|
|
try:
|
|
example()
|
|
except CodesInternalError as err:
|
|
if VERBOSE:
|
|
traceback.print_exc(file=sys.stderr)
|
|
else:
|
|
sys.stderr.write(err.msg + '\n')
|
|
|
|
return 1
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|