Geocalc
Documentation: http://hexdocs.pm/geocalc
Calculate distance, bearing and more between latitude/longitude points
All the formulas are adapted from http://www.movable-type.co.uk/scripts/latlong.html
Installation
First, add Geocalc to your mix.exs dependencies:
def deps do
[{:geocalc, "~> 0.5"}]
endThen, update your dependencies:
$ mix deps.getNow, list the :geocalc application as your
application dependency:
def application do
[applications: [:geocalc]]
endUsage
Calculate distance (in meters) between 2 points
Geocalc.distance_between([50.0663889, -5.7147222], [58.6438889, -3.07])
# => 968853.5464535094Get destination point given distance (meters) from start and end point
Geocalc.destination_point([50.0663889, -5.7147222], [58.6438889, -3.07], 100_000)
# => {:ok, [50.95412546615634, -5.488452905258299]}Get destination point given distance (meters) and bearing from start point
Geocalc.destination_point([50.0663889, -5.7147222], 2.123, 100_000)
# => {:ok, [49.58859917965055, -4.533613856982982]}Calculate bearing from start and end points
Geocalc.bearing([50.0663889, -5.7147222], [58.6438889, -3.07])
# => 0.1591708517503001Get intersection point given start points and bearings
Geocalc.intersection_point([50.0663889, -5.7147222], 2.123, [55.0663889, -15.7147222], 2.123)
# => {:ok, [48.04228582473962, -1.0347033632388496]}
Geocalc.intersection_point([50.0663889, -5.7147222], 2.123, [50.0663889, -5.7147222], 2.123)
# => {:error, "No intersection point found"}Get bounding box from a point and radius
berlin = [52.5075419, 13.4251364]
radius = 10_000
Geocalc.bounding_box(berlin, radius)
# => [[52.417520954378574, 13.277235453275123], [52.59756284562143, 13.573037346724874]]Get geographical center point
berlin = [52.5075419, 13.4251364]
london = [51.5286416, -0.1015987]
rome = [41.9102415, 12.3959161]
Geocalc.geographic_center([berlin, london, rome])
# => [48.810406537400254, 8.785092188535195]Convert degrees to radians
Geocalc.degrees_to_radians(245)
# => -2.007128639793479Convert radians to degrees
Geocalc.radians_to_degrees(1.234)
# => 70.70299191914359Geocalc.Point protocol
Everything which implements Geocalc.Point protocol can be passed as a point
argument for any function in this library.
We already have implementations for List, Tuple and Map.
You can define your own implementations if you need, everything we need to know
to do calculations are latitude and longitude.
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