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# (C) Copyright 2005- 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: metar_get_keys
#
# Description: how to read values of different type of keys from METAR messages
#
#
import sys
import traceback
from eccodes import *
INPUT = "../../data/metar/metar.txt"
VERBOSE = 1 # verbose error reporting
def print_keys(msg_id):
keys = [
"CCCC",
"latitude",
"longitude",
"dateTime",
"elevation",
"temperature",
"dewPointTemperature",
"qnh",
]
for key in keys:
try:
if codes_is_defined(msg_id, key):
print(" %s: %s" % (key, codes_get(msg_id, key)))
except CodesInternalError as err:
print('Error with key="%s" : %s' % (key, err.msg))
def example1():
# open METAR file
f = open(INPUT)
cnt = 0
# loop for the messages in the file
while 1:
# get handle for message
msg_id = codes_metar_new_from_file(f)
if msg_id is None:
break
print("message: %s" % cnt)
print_keys(msg_id)
cnt += 1
# delete handle
codes_release(msg_id)
# close the file
f.close()
def example2():
# This time read from a string rather than a file.
metar_str = "METAR LQMO 022350Z 09003KT 6000 FEW010 SCT035 BKN060 08/08 Q1003="
# get handle for message
msg_id = codes_new_from_message(metar_str)
print("\nFrom string: '%s'" % metar_str)
print_keys(msg_id)
codes_release(msg_id)
def main():
try:
example1()
example2()
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())
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