vHasDatabase: Tests if a GRASS vector is linked to an attribute table

In adamlilith/fasterRaster: Faster Raster and Spatial Vector Processing Using 'GRASS GIS'

Tests if a GRASS vector is linked to an attribute table

Description

GRASS vectors can be lined to one or more attribute tables, or "databases.". This function tests to see if the vector does indeed have a database. This function is typically used by developers.

Usage

.vHasDatabase(x)

Arguments

x	A GVector or the sources() name of a vector in GRASS.

Value

Logical.

Examples

if (grassStarted()) {

madRivers <- fastData("madRivers")
rivers <- fast(madRivers)

.vCats(rivers)
.vHasDatabase(rivers)
.vAsDataTable(rivers)
.vRecat(rivers) # dangerous--re-categorizes geometries!
.vValidCats(rivers)

.vDetachDatabase(rivers) # dangerous--detaches database!
.vAttachDatabase(rivers)

# Ensure we don't use this for other examples!
.rm(rivers) # delete in GRASS
rm(rivers) # delete in R

}

adamlilith/fasterRaster documentation built on Sept. 23, 2024, 1:28 a.m.