haversine

I'm trying to write a category for CLLocation to return the bearing to another CLLocation. I believe I'm doing something wrong with the formula (calculous is not my strong suit). The returned bearing is always off. I've been looking at this question and tried applying the changes that were accepted as a correct answer and the webpage it references: Calculating bearing between two CLLocationCoordinate2Ds http://www.movable-type.co.uk/scripts/latlong.html Thanks for any pointers. I've tried incorporating the feedback from that other question and I'm still just not getting something. Thanks Here

I know that to find the distance between two latitude, longitude points I need to use the haversine function: def haversine(lon1, lat1, lon2, lat2): lon1, lat1, lon2, lat2 = map(radians, [lon1, lat1, lon2, lat2]) 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 I have a DataFrame where one column is latitude and another column is longitude. I want to find out how far these points are from a set point, -56.7213600, 37.2175900. How do I take the values from the DataFrame and put them into the function?

Each row in a Pandas dataframe contains lat/lng coordinates of 2 points. Using the Python code below, calculating the distances between these 2 points for many (millions) of rows takes a very long time! Considering that the 2 points are under 50 miles apart and accuracy is not very important, is it possible to make the calculation faster? from math import radians, cos, sin, asin, sqrt 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

Hi I have the need to calculate the distance between two points having the lat and long. I would like to avoid any call to external API. I tried to implement the Haversine Formula in PHP: Here is the code: class CoordDistance { public $lat_a = 0; public $lon_a = 0; public $lat_b = 0; public $lon_b = 0; public $measure_unit = 'kilometers'; public $measure_state = false; public $measure = 0; public $error = ''; public function DistAB() { $delta_lat = $this->lat_b - $this->lat_a ; $delta_lon = $this->lon_b - $this->lon_a ; $earth_radius = 6372.795477598; $alpha = $delta_lat/2; $beta = $delta_lon