gcIntersect

Get the two points where two great cricles cross each other. Great circles are defined by two points on it.

 spatial 

Spherical trigonometry for geographic applications. That is, compute distances and related measures for angular (longitude/latitude) locations.

Robert Hijmans

geosphere

Spherical Trigonometry

Robert J. Hijmans

Charles Karney

Ed Williams

Chris Vennes

gcIntersect function

<dl> <dt>p1</dt>
<dd>Longitude/latitude of a single point, in degrees; can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object</dd> <dt>p2</dt>
<dd>As above</dd> <dt>p3</dt>
<dd>As above</dd> <dt>p4</dt>
<dd>As above</dd></dl>

Arguments

Robert Hijmans, based on equations by Ed Williams (see reference)

Author

Intersections of two great circles — gcIntersect

<dl>

 <dt>p1</dt>
<dd>Longitude/latitude of a single point, in degrees; can be a vector of two numbers, a matrix of 2 columns (first one is longitude, second is latitude) or a SpatialPoints* object</dd>

 <dt>p2</dt>
<dd>As above</dd>

 <dt>p3</dt>
<dd>As above</dd>

 <dt>p4</dt>
<dd>As above</dd>

</dl>

gcIntersect: Intersections of two great circles

Description

Usage

Value

Arguments

Author

References

See Also

Examples