network_knn_worker

The worker the K-nearest points for a set of points on a network.

internal

Perform spatial analysis on network.
Implement several methods for spatial analysis on network: Network Kernel Density estimation,
building of spatial matrices based on network distance ('listw' objects from 'spdep' package), K functions estimation
for point pattern analysis on network, k nearest neighbours on network, reachable area calculation, and graph generation
References: Okabe et al (2019) <doi:10.1080/13658810802475491>;
Okabe et al (2012, ISBN:978-0470770818);Baddeley et al (2015, ISBN:9781482210200).

Jeremy Gelb

spNetwork

Spatial Analysis on Network

Philippe Apparicio

network_knn_worker function

<dl><dt>points</dt>
<dd>A feature collection of points, for each point, its k nearest
neighbours will be found on the network.</dd>
<dt>lines</dt>
<dd>A feature collection of lines representing the network</dd>
<dt>k</dt>
<dd>An integer indicating the number of neighbours to find..</dd>
<dt>direction</dt>
<dd>Indicates a field providing information about authorized
travelling direction on lines. if NULL, then all lines can be used in both
directions. Must be the name of a column otherwise. The values of the
column must be "FT" (From - To), "TF" (To - From) or "Both".</dd>
<dt>use_dest</dt>
<dd>A boolean indicating if the origins and separations are
separated (TRUE), FALSE if only origins are used.</dd>
<dt>verbose</dt>
<dd>A Boolean indicating if the function should print its
progress</dd>
<dt>digits</dt>
<dd>The number of digits to retain in the spatial coordinates (
simplification used to reduce risk of topological error)</dd>
<dt>tol</dt>
<dd>A float indicating the spatial tolerance when points are
added as vertices to lines.</dd></dl>

Arguments

worker function for K-nearest points on network — network_knn_worker

<dl>

<dt>points</dt>
<dd>A feature collection of points, for each point, its k nearest
neighbours will be found on the network.</dd>


<dt>lines</dt>
<dd>A feature collection of lines representing the network</dd>


<dt>k</dt>
<dd>An integer indicating the number of neighbours to find..</dd>


<dt>direction</dt>
<dd>Indicates a field providing information about authorized
travelling direction on lines. if NULL, then all lines can be used in both
directions. Must be the name of a column otherwise. The values of the
column must be "FT" (From - To), "TF" (To - From) or "Both".</dd>


<dt>use_dest</dt>
<dd>A boolean indicating if the origins and separations are
separated (TRUE), FALSE if only origins are used.</dd>


<dt>verbose</dt>
<dd>A Boolean indicating if the function should print its
progress</dd>


<dt>digits</dt>
<dd>The number of digits to retain in the spatial coordinates (
simplification used to reduce risk of topological error)</dd>


<dt>tol</dt>
<dd>A float indicating the spatial tolerance when points are
added as vertices to lines.</dd>

</dl>

network_knn_worker: worker function for K-nearest points on network

Description

Usage

Value

Arguments

Examples