1#
2# Copyright 2005-2018 ECMWF.
3#
4# This software is licensed under the terms of the Apache Licence Version 2.0
5# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
6#
7# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
8# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
9#
10
11import traceback
12import sys
13
14from gribapi import *
15
16VERBOSE = 1  # verbose error reporting
17
18
19def example(INPUT):
20    f = open(INPUT)
21
22    while 1:
23        gid = grib_new_from_file(f)
24        if gid is None:
25            break
26
27        iterid = grib_iterator_new(gid, 0)
28
29        bitmapPresent = grib_get(gid, 'bitmapPresent')
30        if bitmapPresent:
31            # Get the bitmap array which contains 0s and 1s
32            bitmap = grib_get_array(gid, 'bitmap', int)
33            # Do some sanity checking
34            assert len(bitmap) == grib_get_size(gid, 'values')
35            assert len(bitmap) == grib_get(gid, 'numberOfDataPoints')
36
37        i = 0
38        while 1:
39            result = grib_iterator_next(iterid)
40            if not result:
41                break
42
43            [lat, lon, value] = result
44            sys.stdout.write("- %d - lat=%.6e lon=%.6e value=" % (i, lat, lon))
45
46            # Consult bitmap to see if the i'th value is missing
47            if bitmapPresent and bitmap[i] == 0:
48                print "missing"
49            else:
50                print "%.6f" % value
51
52            i += 1
53
54        grib_iterator_delete(iterid)
55        grib_release(gid)
56
57    f.close()
58
59
60def main():
61    try:
62        example(sys.argv[1])
63    except GribInternalError, err:
64        if VERBOSE:
65            traceback.print_exc(file=sys.stderr)
66        else:
67            print >>sys.stderr, err.msg
68
69        return 1
70
71if __name__ == "__main__":
72    sys.exit(main())
73