mirror of https://github.com/ecmwf/eccodes.git
82 lines
2.1 KiB
Python
82 lines
2.1 KiB
Python
# (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: grib_get_keys
|
|
#
|
|
# Description: how to get values using keys from GRIB messages
|
|
#
|
|
|
|
from __future__ import print_function
|
|
|
|
import sys
|
|
import traceback
|
|
|
|
from eccodes import *
|
|
|
|
INPUT = "../../data/reduced_latlon_surface.grib1"
|
|
VERBOSE = 1 # verbose error reporting
|
|
|
|
|
|
def example():
|
|
f = open(INPUT, "rb")
|
|
|
|
keys = [
|
|
"Ni",
|
|
"Nj",
|
|
"latitudeOfFirstGridPointInDegrees",
|
|
"longitudeOfFirstGridPointInDegrees",
|
|
"latitudeOfLastGridPointInDegrees",
|
|
"longitudeOfLastGridPointInDegrees",
|
|
]
|
|
|
|
while 1:
|
|
gid = codes_grib_new_from_file(f)
|
|
if gid is None:
|
|
break
|
|
|
|
for key in keys:
|
|
try:
|
|
print(" %s: %s" % (key, codes_get(gid, key)))
|
|
except KeyValueNotFoundError as err:
|
|
# Full list of exceptions here:
|
|
# https://confluence.ecmwf.int/display/ECC/Python+exception+classes
|
|
print(' Key="%s" was not found: %s' % (key, err.msg))
|
|
except CodesInternalError as err:
|
|
print('Error with key="%s" : %s' % (key, err.msg))
|
|
|
|
print(
|
|
"There are %d values, average is %f, min is %f, max is %f"
|
|
% (
|
|
codes_get_size(gid, "values"),
|
|
codes_get(gid, "average"),
|
|
codes_get(gid, "min"),
|
|
codes_get(gid, "max"),
|
|
)
|
|
)
|
|
|
|
codes_release(gid)
|
|
|
|
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())
|