我有两种方法可以计算 python 中地理坐标之间的距离:
from pyproj import Proj
import math
def calc_distance(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(math.radians, [lon1, lat1, lon2, lat2])
# haversine formula
dlon = lon2 - lon1
dlat = lat2 - lat1
a = math.sin(dlat / 2) ** 2 + math.cos(lat1) * math.cos(lat2) * math.sin(dlon / 2) ** 2
c = 2 * math.asin(math.sqrt(a))
km = 6371 * c
return km
def calc_distance_convert_utm(lat1, lon1, lat2, lon2):
myProj = Proj("+proj=utm +zone=42, +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs")
# convert to utm
utm_x1, utm_y1 = myProj(lat1, lon1)
utm_x2, utm_y2 = myProj(lat2, lon2)
diff_x = abs(utm_x1 - utm_x2)
diff_y = abs(utm_y1 - utm_y2)
distance = math.sqrt(diff_x**2 + diff_y**2)
return distance
我用以下值调用它:
lat1 = 34.866527
lon1 = 69.674606
lat2 = 34.864990
lon2 = 69.657655
print "approximation method: ", calc_distance(lat1, lon1, lat2, lon2)
print "converting to utm method: ", calc_distance_convert_utm(lat1, lon1, lat2, lon2)
但是,如果我比较结果,我会得到两个不同的值:
approximation method: 1.55593476881
converting to utm method: 1928.21537269
请注意,第一种方法以公里为单位返回距离,而第二种方法以米为单位返回。我已经将结果与您可以在网上找到的距离计算器进行了比较,似乎第一种方法(近似方法)是“更正确”的答案,因为这是大多数在线计算器返回的值。我想知道,为什么第二种方法(首先转换为 utm)没有返回更相似的结果(类似于 1555.9347...)。我有将近 0.5 公里的差异,这对我来说似乎很重要。
我做错什么了吗?任何帮助表示赞赏!谢谢