onGreatCircle

Test if a point is on a great circle defined by two other points.

 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

onGreatCircle function

<dl> <dt>p1</dt>
<dd>Longitude/latitude of the first point defining a great circle, 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 for the second point</dd> <dt>p3</dt>
<dd>the point(s) to be tested if they are on the great circle or not</dd> <dt>tol</dt>
<dd>numeric. maximum distance from the great circle (in degrees) that is tolerated to be considered on the circle</dd>
 
</dl>

Arguments

Author

Is a point on a given great circle? — onGreatCircle

<dl>

 <dt>p1</dt>
<dd>Longitude/latitude of the first point defining a great circle, 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 for the second point</dd>

 <dt>p3</dt>
<dd>the point(s) to be tested if they are on the great circle or not</dd>

 <dt>tol</dt>
<dd>numeric. maximum distance from the great circle (in degrees) that is tolerated to be considered on the circle</dd>
 
</dl>

onGreatCircle: Is a point on a given great circle?

Description

Usage

Value

Arguments

Author

Examples