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A C# class library that will calculate distance and cardinal direction between two sets of coordinates and provides the lat/long boundaries around an origin coordinate allowing for simple SQL or LINQ selection of locations within the given radius.
branch: master


All methods support passing Coordinate objects as parameters as well as decimal lat/long values. Assuming the following Coordinate objects, the examples below show two different ways to make the same call:

Coordinate origin = new Coordinate(34.0675918, -118.3977091);
Coordinate destination = new Coordinate(34.076234, -118.395314);

Find the distance between two points:

double distance = GeoCalculator.GetDistance(34.0675918, -118.3977091, 34.076234, -118.395314, 1);
double distance = GeoCalculator.GetDistance(origin, destination, 1);

Find the cardinal direction (e.g. N, NW, W) from an origin coordinate to a destination coordinate:

string direction = GeoCalculator.GetDirection(34.0675918, -118.3977091, 34.076234, -118.395314);
string direction = GeoCalculator.GetDirection(origin, destination);

Find the bearing (degrees) from an origin coordinate to a destination coordinate:

double bearing = GeoCalculator.GetBearing(34.0675918, -118.3977091, 34.076234, -118.395314);
double bearing = GeoCalculator.GetBearing(origin, destination);

Find the lat/long boundaries for a given origin coordinate and radius:

CoordinateBoundaries boundaries = new CoordinateBoundaries(34.0675918, -118.3977091, 25);
CoordinateBoundaries boundaries = new CoordinateBoundaries(origin, 25);

double minLatitude = boundaries.MinLatitude;
double maxLatitude = boundaries.MaxLatitude;
double minLongitude = boundaries.MinLongitude;
double maxLongitude = boundaries.MaxLongitude;

var results = _locations
  .Where(x => x.Latitude >= minLatitude && x.Latitude <= maxLatitude)
  .Where(x => x.Longitude >= minLongitude && x.Longitude <= maxLongitude)
  .Select(result => new 
    Name = result.Name,
    Distance = GeoCalculator.GetDistance(origin.Latitude, origin.Longitude, result.Latitude, result.Longitude, 1),
    Direction = GeoCalculator.GetDirection(origin.Latitude, origin.Longitude, result.Latitude, result.Longitude)
  .Where(x => x.Distance <= 25)
  .OrderBy(x => x.Distance);
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