e2ecdcfe33
Former-commit-id:a02aeb236c[formerly9f19e3f712] [formerlya02aeb236c[formerly9f19e3f712] [formerly06a8b51d6d[formerly 64fa9254b946eae7e61bbc3f513b7c3696c4f54f]]] Former-commit-id:06a8b51d6dFormer-commit-id:8e80217e59[formerly3360eb6c5f] Former-commit-id:377dcd10b9
85 lines
3 KiB
Python
85 lines
3 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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# ----------------------------------------------------------------
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# Calculate Dewpoint Temperature (K) from Temperature (K) and Relative
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# Humdity(0 to 100).
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# ----------------------------------------------------------------
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import numpy
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from numpy import clip
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from numpy import log
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from numpy import sqrt
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from numpy import zeros
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from numpy import where
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from numpy import equal
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from numpy import isnan, NaN
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from unit import celciusToKelvin
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# build an array that contains the higher resolution dpFromTenths where possible, otherwise use the lower resolution dewpoint
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def combineTemps(dewpoint,dpFromTenths):
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return numpy.where(numpy.isnan(dpFromTenths), dewpoint, dpFromTenths)
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##
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# Calculate Dewpoint Temperature (K) from Temperature (K) and Relative
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# Humdity(0 to 100).
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# This function can operate on numpy arrays of the appropriate values.
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#
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# @param T: Temperature in degrees K
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# @param RH: Relative humidity from 0 to 100
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# @return: Dewpoint temperature in degrees K
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# @rtype: numpy array of Python floats or Python float
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def execute1(T,RH):
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"Calculate dewpoint temperature(K) from temperature(K) and relative \
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humidity(0 to 100)."
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rhqc=clip(RH,1.0,100.0)
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b=0.0091379024*T
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b += 6106.396/T
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b -= log(rhqc/100)
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val = b*b
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val -= 223.1986
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val = sqrt(val)
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DpT = b-val
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DpT /= 0.0182758048
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return DpT
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def execute3(P,T,SHx):
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eee=P*SHx/(622.0+0.378*SHx)
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b=26.66082-log(eee)
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result = (b-sqrt(b*b-223.1986))/0.0182758048
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result[isnan(T)] = NaN
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result[eee>980.5386] = NaN
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result[eee<3.777647E-05] = NaN
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return result
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# @param dewpoint: dewpoint in degrees C
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# @param dpFromTenths: dewpoint from thenths in degrees C
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# @return: Dewpoint temperature in degrees K
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# @rtype: numpy array of Python floats or Python float
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def execute4(dewpoint,dpFromTenths):
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return celciusToKelvin(combineTemps(dewpoint, dpFromTenths))
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# @param dewpoint: dewpoint in degrees K
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# @param temperature: Temperature in degrees K
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# @param relHumidity: Relative humidity from 0 to 100
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# @return: Dewpoint temperature in degrees K
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# @rtype: numpy array of Python floats or Python float
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def execute5(dewpoint,temperature,relHumidity):
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TdRH = execute1(temperature, relHumidity)
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return combineTemps(TdRH,dewpoint)
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