irl_graph: Generate an irregular landscape graph

In jsta/irlgraph: Generate Accumulated Cost Surfaces with Irregular Landscape Graphs

Description

Subset the nodes in a matrix of cost values based on user defined point-of-interest coordinates, a user-defined importance cutoff, and a randomly selected proportion of non-null cells. Generate a graph object from this subset using delaunay triangulation.

Usage

irl_graph(dm, poicoords = NA, grainprop = 0.25, cutoff = 0,
  irregular = TRUE)

Arguments

dm	matrix of 2d cost values
poicoords	matrix 2 column point-of-interest coordinates
grainprop	numeric proportion of cells selected as grain cells
cutoff	numeric user-defined importance cutoff
irregular	logical skip irregular node subsetting routine?

Examples

## Not run: 

dm <- matrix(
c(1,  1,  1,  1,  1,
 NA, NA, NA, NA, 1, 
 1,  1,  1,  1,  1,
 1,  1,  1,  1,  1,
 1,  1,  1,  1,  1
 ), ncol = 5, byrow = TRUE)
 
sp::plot(raster::raster(dm))
raster::text(raster::raster(dm), which(raster::raster(dm)[] == 1))

graph <- irl_graph(dm)
plot(graph$graph)
geometry::trimesh(graph$tri$tri, graph$allcoords)

## End(Not run)

jsta/irlgraph documentation built on May 20, 2019, 2:10 a.m.