问题
I am attempting to calculate the bearing between two lat/long.
I don't have a question regarding the function/formula per se,
provided:
def get_bearing(lat1, long1, lat2, long2):
dLon = (long2 - long1)
y = math.sin(dLon) * math.cos(lat2)
x = math.cos(lat1) * math.sin(lat2) - math.sin(lat1) * math.cos(lat2) * math.cos(dLon)
brng = math.atan2(y, x)
brng = np.rad2deg(brng)
return brng
the problem is that the result isn't what is expected.
The intended usage of the function returns the bearing between two lat/long pairs in a (very long) list i.e.
lat1 = path[int(len(path) * location / 1000)][0]
lat2 = path[int(len(path) * location / 1000) + 1][0]
lng1 = path[int(len(path) * location / 1000)][1]
lng2 = path[int(len(path) * location / 1000) + 1][1]
The bearing result then alters the view orientation of the plot where bearing can assume a value in the range [-180, 180]. Ideally, the result would appear such that the line formed between lat1, lng1 and lat2, lng2 is perfectly "vertical" in the plot (lat/lon annotations are switched in plot), see below
I am hoping that someone might be able to deduce the problem from the bearing returned from the function and what the expected bearing should be. A few instances below:
Current Location: 30.07134 -97.23076
Next in path: 30.0709 -97.22907
Calculated Bearing: 88.39967863143139
Expected Bearing: ~-70.67
Current Location: 29.91581 -96.85068
Next in path: 29.91556 -96.85021
Calculated Bearing: 118.9170342272798
Expected Bearing: ~122.67
Current Location: 29.69419 -96.53487
Next in path: 29.69432 -96.53466
Calculated Bearing 141.0271357781952
Expected Bearing: ~56
Current Location: 29.77357 -96.07924
Next in path: 29.77349 -96.07876
Calculated Bearing 165.24612555483893
Expected Bearing: ~104
Happy to provide additional information, thanks in advance for any/all help.
回答1:
Have you considered using pyproj to do the calculations instead of rolling your own?:
import pyproj
geodesic = pyproj.Geod(ellps='WGS84')
fwd_azimuth,back_azimuth,distance = geodesic.inv(lat1, long1, lat2, long2)
In this example fwd_azimuth
is the bearing you are after and back_azimuth
is inverse bearing (going the opposite direction).
I used WGS84 here, so you would need to replace with correct coordinate system, and need to rewrite ensure lat/long are correct type of coordinates for geodesic.inv(). But using a well-tested, existing geo-spatial lib will likely save you a lot of hair pulling.
回答2:
Ended up changing the function:
from geographiclib.geodesic import Geodesic
...
def get_bearing(lat1, lat2, long1, long2):
brng = Geodesic.WGS84.Inverse(lat1, long1, lat2, long2)['azi1']
return brng
回答3:
You can try this new package called Turfpy which is a porting of turf.js in python.
from turfpy import measurement
from geojson import Point, Feature
start = Feature(geometry=Point((-75.343, 39.984)))
end = Feature(geometry=Point((-75.534, 39.123)))
measurement.bearing(start,end)
https://pypi.org/project/turfpy/
来源:https://stackoverflow.com/questions/54873868/python-calculate-bearing-between-two-lat-long