eccodes/examples/python/grib_nearest.py

57 lines
1.3 KiB
Python

#
# Copyright 2005-2016 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.
#
import traceback
import sys
from eccodes import *
INPUT = '../../data/reduced_gaussian_lsm.grib1'
VERBOSE = 1 # verbose error reporting
def example():
points = ((30, -20), (13, 234))
f = open(INPUT)
gid = codes_grib_new_from_file(f)
for lat, lon in points:
nearest = codes_grib_find_nearest(gid, lat, lon)[0]
print lat, lon
print nearest.lat, nearest.lon, nearest.value, nearest.distance, \
nearest.index
four = codes_grib_find_nearest(gid, lat, lon, is_lsm=False, npoints=4)
for i in range(len(four)):
print "- %d -" % i
print four[i]
print "-" * 100
codes_release(gid)
f.close()
def main():
try:
example()
except CodesInternalError as err:
if VERBOSE:
traceback.print_exc(file=sys.stderr)
else:
sys.stderr.write(err.msg + '\n')
return 1
if __name__ == "__main__":
sys.exit(main())