graphab_corridor {graph4lg} | R Documentation |
Computes corridors from least-cost paths already computed in the Graphab project
Description
The function computes corridors around the least-cost paths which have been computed in the Graphab project.
Usage
graphab_corridor(
proj_name,
graph,
maxcost,
format = "raster",
cost_conv = FALSE,
proj_path = NULL,
alloc_ram = NULL
)
Arguments
proj_name |
A character string indicating the Graphab project name.
The project name is also the name of the project directory in which the
file proj_name.xml is. It can be created with |
graph |
A character string indicating the name of the graph with the
links from which the corridors are computed.
This graph has been created with Graphab or using |
maxcost |
An integer or numeric value indicating the maximum cost
distance from the least-cost paths considered for creating the corridors,
in cost distance units (except when |
format |
(optional, default = "raster") A character string indicating whether the output is a raster file or a shapefile layer. |
cost_conv |
FALSE (default) or TRUE. Logical indicating whether numeric
|
proj_path |
(optional) A character string indicating the path to the
directory that contains the project directory. It should be used when the
project directory is not in the current working directory. Default is NULL.
When 'proj_path = NULL', the project directory is equal to |
alloc_ram |
(optional, default = NULL) Integer or numeric value indicating RAM gigabytes allocated to the java process. Increasing this value can speed up the computations. Too large values may not be compatible with your machine settings. |
Details
See more information in Graphab 2.8 manual: https://sourcesup.renater.fr/www/graphab/download/manual-2.8-en.pdf Be careful, when capacity has been changed. The last changes are taken into account for subsequent calculations in a project.
Author(s)
P. Savary
Examples
## Not run:
graphab_corridor(proj_name = "grphb_ex",
graph = "graph",
maxcost = 1000,
format = "raster",
cost_conv = FALSE)
## End(Not run)