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我有下面的方法（haversine），它返回两个gps点之间的距离。下表是我的数据框。在Python中找到两个gps点之间的距离
当我在数据框上使用函数时，出现错误“无法将系列转换为”。不知道我是否缺少一些东西。任何帮助，将不胜感激。
distdf1['distance'] = distdf1.apply(lambda x: haversine(distdf1['SLongitude'], distdf1['SLatitude'], distdf1['ClosestLong'], distdf1['ClosestLat']), axis=1)
数据框：
SLongitude SLatitude ClosestLong ClosestLat
0 -100.248093 25.756313 -98.220240 26.189491
1 -77.441536 38.991512 -77.481600 38.748722
2 -72.376370 40.898690 -73.662870 41.025640
方法：
def haversine(lon1, lat1, lon2, lat2):
"""
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))
km = 6367 * c
return km