mirror of https://github.com/ecmwf/eccodes.git
109 lines
3.3 KiB
Python
109 lines
3.3 KiB
Python
# 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_read_temp
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#
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# Description: how to read temperature significant levels from TEMP BUFR messages.
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#
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#
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# Please note that TEMP reports can be encoded in various ways in BUFR. Therefore the code
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# below might not work directly for other types of TEMP messages than the one used in the
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# example. It is advised to use bufr_dump to understand the structure of the messages.
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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/temp_101.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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# 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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# In what follows we rely on the fact that for
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# temperature significant levels the value of key
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# verticalSoundingSignificance is 4 (see flag table 8001 for details).
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# We also make use of the fact that in our BUFR message
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# verticalSoundingSignificance is always followed by geopotential,
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# airTemperature, dewpointTemperature,
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# windDirection, windSpeed and pressure.
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# Get the number of the temperature significant levels.
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# We find out the number of temperature significant levels by
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# counting how many pressure values we have on these levels.
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numSigT=codes_get_size(gid,"/verticalSoundingSignificance=4/pressure")
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print ' Number of temperature significant levels %ld' % (numSigT)
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# Get pressure
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sigt_pres=codes_get_array(gid,"/verticalSoundingSignificance=4/pressure")
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# Get gepotential
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sigt_geo=codes_get_array(gid,"/verticalSoundingSignificance=4/geopotential")
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# Get temperature
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sigt_t=codes_get_array(gid,"/verticalSoundingSignificance=4/airTemperature")
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# Get dew point
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sigt_td=codes_get_array(gid,"/verticalSoundingSignificance=4/dewpointTemperature")
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# Check that all arrays are same size
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if len(sigt_pres) != numSigT or len(sigt_geo) != numSigT or len(sigt_t) != numSigT or len(sigt_td) != numSigT :
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print 'inconsistent array dimension'
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return 1
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# Print the values
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print "lev pres geo t td"
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print "-------------------------------"
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for i in xrange(numSigT):
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print "%3d %6.0f %6.0f %.1f %.1f" % (i+1,sigt_pres[i],sigt_geo[i],sigt_t[i],sigt_td[i])
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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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