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seumasmorrison/decibar_to_metres_depth.py

Last active December 24, 2015 13:49
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Function for converting salt water pressure readings to depth in metres taking account of latitude. Based upon Seabird description of UNESCO formulae - http://www.seabird.com/application_notes/AN69.htm
Raw
decibar_to_metres_depth.py
import math
def decibars_to_metres(latitude, pressure):
x = (math.sin(latitude/ 57.29578))**2
g = 9.780318 * ( 1.0 + ( 5.2788*(10**-3) + (2.36*(10**-5)) * x) * x ) + \
(1.092 * (10**-6) ) * pressure
return (((-1.82*(10**-15) * pressure + 2.279*(10**-10) ) * \
pressure - 2.2512*(10**-5) * pressure + 9.72659) * pressure) / g
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