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#### strategy::distance::cross_track

Strategy functor for distance point to segment calculation.

###### Description

Class which calculates the distance of a point to a segment, using latlong points

###### Synopsis

    template<typename Point, typename PointOfSegment, typename CalculationType, typename Strategy>
    class strategy::distance::cross_track
    {
      // ...
    };

###### Template parameter(s)

Parameter | Default | Description
--- | --- | ---
typename Point |  | point type
typename PointOfSegment | Point | segment point type
typename CalculationType | void | numeric type for calculation (e.g. high precision); if void then it is extracted automatically from the coordinate type and (if necessary) promoted to floating point
typename Strategy | typename services::default_strategy<point_tag, Point>::type | underlying point-point distance strategy, defaults to haversine

###### Constructor(s)

Function | Description | Parameters
--- | --- | ---

    cross_track()

    cross_track(return_type const & r)

return_type const &: r:

    cross_track(Strategy const & s)

Strategy const &: s:

###### Member Function(s)

Function | Description | Parameters | Returns
--- | --- | --- | ---

    return_type apply(Point const & p, PointOfSegment const & sp1, PointOfSegment const & sp2)

Point const &: p:

PointOfSegment const &: sp1:

PointOfSegment const &: sp2:

    return_type radius()

###### Header

`#include <boost/geometry/strategies/spherical/distance_cross_track.hpp>`

###### See also

distance (with strategy)