gcIntermediate

Get intermediate points (way points) between the two locations with longitude/latitude coordinates. gcIntermediate is based on a spherical model of the earth and internally uses <code>distCosine</code>.

 spatial 

intermediate

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

intermediate function

<dl> <dt>p1</dt>
<dd>longitude/latitude of a single point, in degrees. This 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 for <code>p1</code></dd> <dt>n</dt>
<dd>integer. The desired number of intermediate points</dd> <dt>breakAtDateLine</dt>
<dd>logical. Return two matrices if the dateline is crossed?</dd> <dt>addStartEnd</dt>
<dd>logical. Add p1 and p2 to the result?</dd> <dt>sp</dt>
<dd>logical. Return a SpatialLines object?</dd> <dt>sepNA</dt>
<dd>logical. Rather than as a list, return the values as a two column matrix with lines seperated by a row of NA values? (for use in 'plot')</dd></dl>

Arguments

Robert Hijmans based on code by Ed Williams (great circle)

Author

Intermediate points on a great circle (sphere) — intermediate

<dl>

 <dt>p1</dt>
<dd>longitude/latitude of a single point, in degrees. This 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 for <code>p1</code></dd>

 <dt>n</dt>
<dd>integer. The desired number of intermediate points</dd>

 <dt>breakAtDateLine</dt>
<dd>logical. Return two matrices if the dateline is crossed?</dd>

 <dt>addStartEnd</dt>
<dd>logical. Add p1 and p2 to the result?</dd>

 <dt>sp</dt>
<dd>logical. Return a SpatialLines object?</dd>

 <dt>sepNA</dt>
<dd>logical. Rather than as a list, return the values as a two column matrix with lines seperated by a row of NA values? (for use in 'plot')</dd>

</dl>

intermediate: Intermediate points on a great circle (sphere)

Description

Usage

Value

Arguments

Author

References

Examples