pointsSLDFchain

For a set of points, obtains the closest Line object in a
 SpatialLinesDataFrame. The function assumes that each Feature (entry
 in the DataFrame part of the SpatialLinesDataFrame) just contains one
 <code>Line</code> (i.e. one polyline). The within-polyine chainage (that is,
 distance from the initial point of the poyline to the mapping of the
 point into the polyline) is also returned. If mask is NULL, each point
 in the set is assigned a line in SLDF by Euclidean distance. If mask
 is provided, the match between <code>mask</code> and the <code>SLmsk</code>
 field in <code>SLDF</code> is used instead for polyline assignation.

 utilities

 spatial 

Provision of the S4 SpatialGraph class built on top of objects provided by 'igraph' and 'sp' packages, and associated utilities. See the documentation of the SpatialGraph-class within this package for further description. An example of how from a few points one can arrive to a SpatialGraph is provided in the function sl2sg().

Javier Garcia-Pintado

SpatialGraph

The SpatialGraph Class and Utilities

pointsSLDFchain function

<dl> <dt>SLDF</dt>
<dd><code>SpatialLinesDataFrame</code></dd> <dt>xy</dt>
<dd>REAL [n,2] matrix of points, or a <code>SpatialPointsDataFrame</code></dd> <dt>SLmsk</dt>
<dd>is !is.null(mask) this is the field in the SLDF data.frame matching the values in mask</dd> <dt>mask</dt>
<dd>REAL, OPT, [n] a vector indicating to which line in SLDF is
	 related each point</dd> <dt>type</dt>
<dd>character. Either 'SpatialPointsDataFrame' or
 'mapping'. In the latter case, just the chainage in line feature
 identifiers are returned</dd></dl>

Arguments

Javier Garcia-Pintado, e-mail: <a href="/link/jgarciapintado%40marum.de?package=SpatialGraph&version=1.0-4" data-mini-rdoc="SpatialGraph::jgarciapintado@marum.de">jgarciapintado@marum.de</a>

Author

Obtain chainage from sparse points along a SpatialLinesDataFrame — pointsSLDFchain

<dl>

 <dt>SLDF</dt>
<dd><code>SpatialLinesDataFrame</code></dd>

 <dt>xy</dt>
<dd>REAL [n,2] matrix of points, or a <code>SpatialPointsDataFrame</code></dd>

 <dt>SLmsk</dt>
<dd>is !is.null(mask) this is the field in the SLDF data.frame matching the values in mask</dd>

 <dt>mask</dt>
<dd>REAL, OPT, [n] a vector indicating to which line in SLDF is
	 related each point</dd>

 <dt>type</dt>
<dd>character. Either 'SpatialPointsDataFrame' or
 'mapping'. In the latter case, just the chainage in line feature
 identifiers are returned</dd>

</dl>

Javier Garcia-Pintado, e-mail: <a href='mailto:jgarciapintado@marum.de'>jgarciapintado@marum.de</a>

pointsSLDFchain: Obtain chainage from sparse points along a SpatialLinesDataFrame

Description

Usage

Value

Arguments

Author