Create a GVector

Create a GVector from a vector existing in the current GRASS session.

Usage

.makeGVector(
  src,
  table = NULL,
  build = TRUE,
  extensive = FALSE,
  cats = NULL,
  fail = TRUE
)

src: Character: The name of the vector in GRASS.
table: A data.table, data.frame, GVector with a table, or character. This can be data.table(NULL) or data.frame(NULL) if there is no table associated with the vector. If a character, this is interpreted as the name of the table in GRASS.
build: Logical: If TRUE (default), build topology using GRASS module v.build.
extensive: Logical: If TRUE, do extensive topological checks using v.build. The default is FALSE.
cats: NULL (default) or an integer vector: Values of the "cats" (categories) of the vector in GRASS. This is useful only for speeding up the GVector creation process when the "cats" have already been ascertained.
fail: Logical: If TRUE (default), and the vector either has a 0 east-west or north-south extent, then exit the function with an error. If fail is FALSE, then display a warning and return NULL.

A GVector (or NULL if fail is TRUE and the GVector would be invalid).