# (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. from __future__ import print_function import traceback import sys from eccodes import * INPUT = '../../data/regular_latlon_surface.grib1' OUTPUT = 'out.set_bitmap_p.grib' MISSING = 9999 VERBOSE = 1 # verbose error reporting def example(): fin = open(INPUT, 'rb') fout = open(OUTPUT, 'wb') gid = codes_grib_new_from_file(fin) # The missingValue is not coded in the message. # It is a value we define as a placeholder for a missing value # at a point in the grid. # It should be chosen so that it cannot be confused # with a valid field value codes_set(gid, 'missingValue', MISSING) values = codes_get_values(gid) # Enable bitmap codes_set(gid, 'bitmapPresent', 1) # Change some data values to be missing num_missing = 0 for i in range(100): # Set every other value to a missing value if i % 2 == 0: values[i] = MISSING num_missing += 1 codes_set_values(gid, values) # Check counts of missing and non-missing values num_data = codes_get(gid, 'numberOfDataPoints', int) assert num_data == len(values) assert codes_get(gid, 'numberOfCodedValues', int) == num_data - num_missing assert codes_get(gid, 'numberOfMissing', int) == num_missing codes_write(gid, fout) codes_release(gid) fin.close() fout.close() def main(): try: example() except CodesInternalError as err: if VERBOSE: traceback.print_exc(file=sys.stderr) else: print(err.msg, file=sys.stderr) return 1 if __name__ == "__main__": sys.exit(main())