96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
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# ----------------------------------------------------------------------------
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# This software is in the public domain, furnished "as is", without technical
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# support, and with no warranty, express or implied, as to its usefulness for
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# any purpose.
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#
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# ApparentTemperature.py
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#
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# Author: amoore
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# ----------------------------------------------------------------------------
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##
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# This is an absolute override file, indicating that a higher priority version
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# of the file will completely replace a lower priority version of the file.
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##
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ToolType = "numeric"
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WeatherElementEdited = "ApparentT"
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HideTool = 0
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ScreenList = ["ApparentT"]
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from numpy import *
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import SmartScript
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class Tool (SmartScript.SmartScript):
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def __init__(self, dbss):
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SmartScript.SmartScript.__init__(self, dbss)
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def execute(self, T, Td, Wind):
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"Apparent Temperature based on T, Td, Wind"
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ApparentT = where(less(T, 51), self._windChillCalc(T, Wind),
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where(greater(T, 79), self._heatIndexCalc(T, Td),
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T))
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# Return the new value
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return ApparentT
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def _heatIndexCalc(self, T, Td):
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#----------------------
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# Heat Index Equation
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#----------------------
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Tc = .556 * (T - 32.0)
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Tdc = .556 * (Td - 32.0)
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Vt = 6.11 * pow(10,(Tc * 7.5 / (Tc + 237.3)))
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Vd = 6.11 * pow(10,(Tdc * 7.5 / (Tdc + 237.3)))
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RH = (Vd / Vt) * 100.0
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A = -42.379
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B = 2.04901523 * T
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C = 10.14333127 * RH
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D = -0.22475541 * T * RH
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E = -0.00683783 * pow(T, 2)
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F = -0.05481717 * pow(RH, 2)
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G = 0.00122874 * pow(T, 2) * RH
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H = 0.00085282 * T * pow(RH, 2)
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I = -0.00000199 * pow(T, 2) * pow(RH, 2)
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HeatIndexValue = A + B + C + D + E + F + G + H + I
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# make the adjustments for low humidity
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rhLessThan13 = less(RH, 13.0)
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T80to112 = logical_and(greater_equal(T, 80), less_equal(T, 112))
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downMask = logical_and(rhLessThan13, T80to112)
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# make array that is T where conditions are true and 100, otherwise
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adjustT = where(downMask, T, 80.0)
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HeatIndexValue[downMask] = HeatIndexValue[downMask] - (((13.0 - RH[downMask]) / 4.0) * sqrt((17.0 - abs(adjustT[downMask] - 95.0)) / 17))
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# make the adjustments for high humidity
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rhGreater85 = greater(RH, 85.0)
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T80to87 = logical_and(greater_equal(T, 80.0), less_equal(T, 87.0))
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upMask = logical_and(rhGreater85, T80to87)
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HeatIndexValue[upMask] = HeatIndexValue[upMask] + (((RH[upMask] - 85.0) / 10.0) * ((87 - T[upMask]) / 5.0))
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return HeatIndexValue
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def _windChillCalc(self, T, Wind):
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#---------------------
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# Wind Chill Equation
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#---------------------
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mag = Wind[0] * 1.15
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WindChillValue = where(less_equal(mag, 3), T, 35.74 + (0.6215 * T) -
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(35.75 * (mag ** 0.16)) + (0.4275 * T * (mag ** 0.16)))
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mask = greater(WindChillValue, T)
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WindChillValue[mask] = T[mask]
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return WindChillValue
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