34 lines
1.1 KiB
Python
34 lines
1.1 KiB
Python
##
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# This software was developed and / or modified by Raytheon Company,
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# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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#
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# U.S. EXPORT CONTROLLED TECHNICAL DATA
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# This software product contains export-restricted data whose
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# export/transfer/disclosure is restricted by U.S. law. Dissemination
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# to non-U.S. persons whether in the United States or abroad requires
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# an export license or other authorization.
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#
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# Contractor Name: Raytheon Company
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# Contractor Address: 6825 Pine Street, Suite 340
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# Mail Stop B8
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# Omaha, NE 68106
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# 402.291.0100
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#
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# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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# further licensing information.
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##
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from numpy import power, piecewise
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T0 = 288.0
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gamma = 0.0065
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p0 = 1013.2
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c1 = 5.256
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c2 = 14600
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z11 = 11000
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p11 = 226.0971
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# Routine to calculate pressure from height based on a standard
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# atmosphere
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def execute(z):
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return piecewise(z, [z < z11, z >= z11], [lambda z: p0*power((T0-gamma*z)/T0,c1), lambda z: p11*power(10, (z11-z)/c2)])
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