The `R`

package `irlgraph`

provides the functionality to generate accumulated cost surfaces using irregular landscape graphs.

```
R
install.packages('devtools') # package devtools needed
devtools::install_github('jsta/irlgraph')
```

**Figure 1: Construction of accumulated cost surfaces using irregular landscape graphs. Panels from left to right represent the process of: identifying graph nodes, Delaunay triangulation, generating partial accumulated cost surfaces, and interpolating to produce full accumulated cost surfaces.**

**Figure 2: Comparison of system.time processing speed when using regular and irregular graphs to produce accumulated cost surfaces. The performance benefit of irregular graphs becomes apparent with greater numbers of starting nodes.**

**Figure 3: Directional bias tests of irregular and regular graph approaches to generating accumulate cost surfaces. The gdistance::geoCorrection function eliminates directional bias associated with regular graphs.**

**see vignette**

**Thomas Etherington (2012)**. Least-cost modelling on irregular landscape graphs.
*Landscape Ecology*
journal

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