mirror of https://github.com/ecmwf/eccodes.git
117 lines
3.4 KiB
Python
117 lines
3.4 KiB
Python
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# Copyright 2005-2015 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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# Python implementation: bufr_attributes
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#
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# Description: how to read attributes of keys in BUFR messages.
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#
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#
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import traceback
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import sys
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from eccodes import *
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INPUT='../../data/bufr/syno_multi.bufr'
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VERBOSE=1 # verbose error reporting
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def example():
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# open bufr file
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f = open(INPUT)
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cnt=0
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# define the attributes to be printed (see BUFR code table B)
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attrs = [
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'code',
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'units',
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'scale',
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'reference',
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'width'
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]
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# loop for the messages in the file
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while 1:
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# get handle for message
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gid = codes_bufr_new_from_file(f)
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if gid is None: break
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print "message: %s" % cnt
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# we need to instruct ecCodes to expand all the descriptors
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# i.e. unpack the data values
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codes_set(gid,'unpack',1);
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#---------------------------------------------------------------
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# We will read the value and all the attributes available for
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# the 2m temperature.
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#---------------------------------------------------------------
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#get the value
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key='airTemperatureAt2M'
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if not codes_is_defined(gid,key):
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raise Exception("Key: " + key + " was not defined")
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print ' %s: %s' % (key,codes_get(gid,key))
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# print the values of the attributes of the key. Attributes themselves
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# are keys as well. Their name is constructed like:
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# keyname->attributename
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for attr in attrs:
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key='airTemperatureAt2M' + "->" + attr
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if not codes_is_defined(gid,key):
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raise Exception("Key: " + key + " was not defined")
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print ' %s: %s' % (key,codes_get(gid,key))
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#--------------------------------------------------------------------
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# The 2m temperature data element in this message has an associated
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# field: percentConfidence. Its value and attributes can be accessed
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# in a similar manner as was shown above for 2m temperature.
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#-------------------------------------------------------------------
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#get the value
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key='airTemperatureAt2M->percentConfidence'
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if not codes_is_defined(gid,key):
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raise Exception("Key: " + key + " was not defined")
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print ' %s: %s' % (key,codes_get(gid,key))
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# print the values of the attributes of the key.
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for attr in attrs:
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key='airTemperatureAt2M->percentConfidence' + "->" + attr
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if not codes_is_defined(gid,key):
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raise Exception("Key: " + key + " was not defined")
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print ' %s: %s' % (key,codes_get(gid,key))
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cnt+=1
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# delete handle
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codes_release(gid)
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# close the file
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f.close()
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def main():
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try:
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example()
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except CodesInternalError,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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print >>sys.stderr,err.msg
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return 1
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if __name__ == "__main__":
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sys.exit(main())
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