awips2/cave/com.raytheon.uf.viz.derivparam.python/localization/derivedParameters/functions/Heli.py

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##
# This software was developed and / or modified by Raytheon Company,
# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
#
# U.S. EXPORT CONTROLLED TECHNICAL DATA
# This software product contains export-restricted data whose
# export/transfer/disclosure is restricted by U.S. law. Dissemination
# to non-U.S. persons whether in the United States or abroad requires
# an export license or other authorization.
#
# Contractor Name: Raytheon Company
# Contractor Address: 6825 Pine Street, Suite 340
# Mail Stop B8
# Omaha, NE 68106
# 402.291.0100
#
# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
# further licensing information.
##
def execute(uStk, vStk, RM5):
umot = RM5[2]
vmot = RM5[3]
u1 = uStk[0]
v1 = vStk[0]
u2 = uStk[-1]
v2 = vStk[-1]
# First do our motion, lower bulk shear computation.
hptr = (v2-v1)*umot+(u1-u2)*vmot
for i in range(1, len(uStk)):
u1 = uStk[i-1]
v1 = vStk[i-1]
u2 = uStk[i]
v2 = vStk[i]
hptr += u2*v1-u1*v2
return hptr