topoSurface

Generates a TransitionLayer object for topographic distance from a RasterLayer

A toolkit for calculating topographic distances and identifying and plotting topographic paths. Topographic distances can be calculated along shortest topographic paths (Wang (2009) <doi:10.1111/j.1365-294X.2009.04338.x>), weighted topographic paths (Zhan et al. (1993) <doi:10.1007/3-540-57207-4_29>), and topographic least cost paths (Wang and Summers (2010) <doi:10.1111/j.1365-294X.2009.04465.x>). Functions can map topographic paths on colored or hill shade maps and plot topographic cross sections (elevation profiles) for the paths.

Ian Wang

topoDistance

Calculating Topographic Paths and Distances

topoSurface function

<dl><dt>DEM</dt>
<dd>A RasterLayer for digital elevation model (DEM) data.</dd>
<dt>conductance</dt>
<dd>logical (default = TRUE). If FALSE, resistance values are returned. If TRUE, conductance values (1/resistance) are returned.</dd>
<dt>directions</dt>
<dd>numeric (default = 8). Directions of allowable movement between raster cells (4 or 8).</dd>
<dt>zweight</dt>
<dd>numeric (default = 1). The weight to be applied to the elevation (z) distances relative to the horizontal (xy) distances.</dd></dl>

Arguments

Topographic distance surface — topoSurface

<dl>

<dt>DEM</dt>
<dd>A RasterLayer for digital elevation model (DEM) data.</dd>


<dt>conductance</dt>
<dd>logical (default = TRUE). If FALSE, resistance values are returned. If TRUE, conductance values (1/resistance) are returned.</dd>


<dt>directions</dt>
<dd>numeric (default = 8). Directions of allowable movement between raster cells (4 or 8).</dd>


<dt>zweight</dt>
<dd>numeric (default = 1). The weight to be applied to the elevation (z) distances relative to the horizontal (xy) distances.</dd>

</dl>

topoSurface: Topographic distance surface

Description

Usage

Value

Arguments

Details

Examples