GRASS GIS comes with a default set of modules (functions), but users can download and install “addon” modules to extend its capabilities. Some of the functions in fasterRaster rely on these addon modules. To make these functions work, you must find the folder in which addons are stored and install the desired module.
Installing modules: The easiest (only?) way to do this is to
start GRASS (not in R through
fasterRaster, but actually start
GRASS), then use the Settings menu’s
Addon extensions option, then select
Install extensions from addons [g.extension].
GRASS should display a list of addons you can
install.
Once you have the desired extension(s) installed, you can use
fasterRaster functions that call them. To do this, you
need to specify the addons folder before starting
GRASS (i.e., before the first time you use the
fast() function to load a raster or vector). Use
faster() to tell fasterRaster where this
folder is. The folder will vary by operating system. On a Windows
machine, it will be something like:
C:/Users/your_windows_user_name/AppData/Roaming/GRASS8/addonsYou can set the addons folder using
faster(addonsDir = "C:/Users/your_windows_user_name/AppData/Roaming/GRASS8/addons").
You can test to see if the addons folder is correct
using addons(). You can also see if a particular addon
module was installed correctly using the same function using, for
example, addons("v.centerpoint").
These functions must have the specified addon to work.
| Function | addon |
|---|---|
centroids() |
v.centerpoint |
~ FINIS ~