Successor to geofun C++ and python library for doing geographic calculations like distance, azimuth and position determination
for geodesics and rhumb lines, orthodromes and loxodromes, respectively.
This version makes use of GeographicLib for doing most of the calculations.
Currently only building on linux is supported. You'll need c++, make and cmake. When you have those, you should be able
to run:
make build && make install
You should also be able to add this module to your python project's virtual environment by add the following to your requirements.txt:
git+https://github.com/jrversteegh/geofun2.git@master#egg=geofun2
pip install -r requirements.txt should then automatically install geofun2 in your virtual environment.
from geofun2 import Position, Vector
# Just off Hoek van Holland
org = Position(52.0, 4.0)
nm95 = 95 * 1852.0
# Go west 95 nm to Felixstowe
rmbv = Vector(270.0, nm95)
pos1 = org + rmbv
# Go to the same point using great circle line
gcv = pos1 / org
pos2 = org * gcv
# We should end up at the same location
assert pos1 == pos2
# How disappointing: we managed to gain just 9m by crossing the
# North sea using a great circle :p
assert nm95 - gcv.length == 9.101067085022805, f'Unexpected: {gcv.length}'
print(f'From {org} to {pos1}')
print(f'Rhumb: {rmbv}')
print(f'Great circle: {gcv}')
# Another verification
assert pos1 - org == rmbv
assert pos1 / org == gcvPosition
- latitude
- longitude
Vector
- azimuth
- length
Point
- x
- y
get_version() -> str
Get the library version
geodesic_direct(latitude: float, longitude: float, azimuth: float, distance: float) -> tuple
Get position and final azimuth after moving distance along great circle with starting azimuth
geodesic_inverse(latitude: float, longitude: float, azimuth: float, distance: float) -> tuple
Get starting azimuth, distance and ending azimuth of great circle between positions
rhumb_direct(latitude: float, longitude: float, azimuth: float, distance: float) -> tuple
Get position and final azimuth after moving distance from starting position at fixed azimuth/along rhumb line
rhumb_inverse(latitude1: float, longitude1: float, latitude2: float, longitude2: float) -> tuple
Get rhumb line azimuth, distance and final azimuth between positions
angle_diff(arg0: numpy.ndarray[numpy.float64], arg1: numpy.ndarray[numpy.float64]) -> object
Signed difference between to angles
angle_mod(arg0: numpy.ndarray[numpy.float64]) -> object
Return angle bound to [0.0, 360.0>
angle_mod_signed(arg0: numpy.ndarray[numpy.float64]) -> object
Return angle bound to [-180.0, 180.0>