gdistance-package: gdistance: geographic distance calculations
Description
Calculate distances and routes on geographic grids.Details
ll{
Package: gdistance
Type: Package
Version: 1.1-1
Date: 2011-01-04
License: GPL (>=3)
LazyLoad: yes
}
Distances can be calculated following these steps.
1. Read spatial grid data into the R environment, using the raster package. Function: raster.
2. Construct an object of the class TransitionLayer or TransitionStack. Function: transition.
3. Correct diagonal connections and projection distortions. Function: geoCorrection.
4. Get coordinates for the starting and end points of routes.
5. Calculate distances and routes. Functions: accCost,
costDistance,
resistanceDistance,
shortestPath,
passage,
pathInc.References
Ray, N. 2005. PATHMATRIX: a geographical information system tool to compute effective distances among samples. Molecular Ecology Notes 5, 177 - 180.
http://cmpg.unibe.ch/software/pathmatrix/
McRae, B.H. 2006. Isolation by resistance. Evolution 60(8), 1551 - 1561.
McRae B.H., B.G. Dickson, and T. Keitt. 2008. Using circuit theory to model connectivity in ecology, evolution, and conservation. Ecology 89:2712-2724.
http://www.circuitscape.org