mirror of https://github.com/ecmwf/eccodes.git
80 lines
2.1 KiB
Python
80 lines
2.1 KiB
Python
#
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# Copyright 2005-2019 ECMWF.
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#
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# This software is licensed under the terms of the Apache Licence Version 2.0
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# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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#
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# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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#
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# Description: How to use an iterator on lat/lon/values and query the bitmap
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# for missing values
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# (rather than compare each value with the missingValue key)
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#
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from __future__ import print_function
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import traceback
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import sys
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from eccodes import *
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VERBOSE = 1 # verbose error reporting
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def example(INPUT):
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f = open(INPUT, 'rb')
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while 1:
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gid = codes_grib_new_from_file(f)
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if gid is None:
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break
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iterid = codes_grib_iterator_new(gid, 0)
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bitmapPresent = codes_get(gid, 'bitmapPresent')
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if bitmapPresent:
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# Get the bitmap array which contains 0s and 1s
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bitmap = codes_get_array(gid, 'bitmap', int)
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# Do some sanity checking
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assert len(bitmap) == codes_get_size(gid, 'values')
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assert len(bitmap) == codes_get(gid, 'numberOfDataPoints')
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i = 0
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while 1:
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result = codes_grib_iterator_next(iterid)
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if not result:
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break
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[lat, lon, value] = result
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sys.stdout.write("- %d - lat=%.6e lon=%.6e value=" % (i, lat, lon))
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# Consult bitmap to see if the i'th value is missing
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if bitmapPresent and bitmap[i] == 0:
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print("missing")
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else:
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print("%.6f" % value)
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i += 1
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codes_grib_iterator_delete(iterid)
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codes_release(gid)
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f.close()
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def main():
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try:
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example(sys.argv[1])
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except CodesInternalError as err:
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if VERBOSE:
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traceback.print_exc(file=sys.stderr)
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else:
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sys.stderr.write(err.msg + '\n')
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return 1
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if __name__ == "__main__":
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sys.exit(main())
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