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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.
#
# Description: How to use an iterator on lat/lon/values and query the bitmap
# for missing values
# (rather than compare each value with the missingValue key)
#
from __future__ import print_function
import traceback
import sys
from eccodes import *
VERBOSE = 1 # verbose error reporting
def example(INPUT):
f = open(INPUT, 'rb')
while 1:
gid = codes_grib_new_from_file(f)
if gid is None:
break
iterid = codes_grib_iterator_new(gid, 0)
bitmapPresent = codes_get(gid, 'bitmapPresent')
if bitmapPresent:
# Get the bitmap array which contains 0s and 1s
bitmap = codes_get_array(gid, 'bitmap', int)
# Do some sanity checking
assert len(bitmap) == codes_get_size(gid, 'values')
assert len(bitmap) == codes_get(gid, 'numberOfDataPoints')
i = 0
while 1:
result = codes_grib_iterator_next(iterid)
if not result:
break
[lat, lon, value] = result
sys.stdout.write("- %d - lat=%.6e lon=%.6e value=" % (i, lat, lon))
# Consult bitmap to see if the i'th value is missing
if bitmapPresent and bitmap[i] == 0:
print("missing")
else:
print("%.6f" % value)
i += 1
codes_grib_iterator_delete(iterid)
codes_release(gid)
f.close()
def main():
try:
example(sys.argv[1])
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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