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Neal Probert
2021-01-22 10:16:17 -05:00
parent 92cd842b54
commit 9e201bd1b8
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classes/gpsmath.py Normal file
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from math import sin, cos, asin, sqrt, radians
earth_flatening = 1.0/298.257223563
earth_radius = 6378137.0
def haversine(lat1, lon1, lat2, lon2):
"""
Calculate the great circle distance between two points
on the earth (specified in decimal degrees)
"""
# convert decimal degrees to radians
lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
# haversine formula
dlon = lon2 - lon1
dlat = lat2 - lat1
a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2
c = 2 * asin(sqrt(a))
# 6367 km is the radius of the Earth
return earth_radius * c
def roydistance(lat1, lon1, lat2, lon2):
"""
Calculate the great circle distance between two points
on the earth (specified in decimal degrees)
"""
# convert decimal degrees to radians
lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2])
# Roy's method
f1 = (1.0 - earth_flatening)
top = (pow((lon2-lon1), 2) * pow(cos(lat1), 2)) + pow(lat2-lat1, 2)
bot = pow(sin(lat1), 2) + (pow(f1, 2) * pow(cos(lat1), 2))
return f1 * earth_radius * sqrt(top/bot)