as_spatvector: Method for coercing objects to 'SpatVector'

In dieghernan/tidyterra: 'tidyverse' Methods and 'ggplot2' Helpers for 'terra' Objects

Method for coercing objects to SpatVector

Description

as_spatvector() turns an existing object into a SpatVector. This is a wrapper of terra::vect() S4 method for signature data.frame.

Usage

as_spatvector(x, ...)

## S3 method for class 'data.frame'
as_spatvector(x, ..., geom = c("lon", "lat"), crs = "")

## S3 method for class 'sf'
as_spatvector(x, ...)

## S3 method for class 'sfc'
as_spatvector(x, ...)

## S3 method for class 'SpatVector'
as_spatvector(x, ...)

Arguments

x	A tibble, data frame or sf object of class sf or sfc.
...	additional arguments passed on to terra::vect().
geom	character. The field name(s) with the geometry data. Either two names for x and y coordinates of points, or a single name for a single column with WKT geometries.
crs	A crs on several formats (PROJ.4, WKT, EPSG code, ..) or and spatial object from sf or terra that includes the target coordinate reference system. See pull_crs() and Details.

Details

This function differs from terra::vect() on the following:

• geometries with NA or "" values are removed prior to conversion

• If x is a grouped data frame (see dplyr::group_by()) the grouping vars are transferred and a "grouped" SpatVector is created (see group_by.SpatVector()).

• If no crs is provided and the tibble has been created with the method as_tibble.SpatVector(), the crs is inferred from attr(x, "crs").

• Handles correctly the conversion of EMPTY geometries between sf and terra.

Value

A SpatVector.

terra equivalent

terra::vect()

See Also

pull_crs() for retrieving crs, and the corresponding utils sf::st_crs() and terra::crs().

Coercing objects: as_coordinates(), as_sf(), as_spatraster(), as_tibble.Spat, fortify.Spat

Examples

library(terra)

v <- vect(matrix(1:80, ncol = 2), crs = "EPSG:3857")

v$cat <- sample(LETTERS[1:4], size = nrow(v), replace = TRUE)

v

# Create tibble
as_tbl <- as_tibble(v, geom = "WKT")

as_tbl

# From tibble
newvect <- as_spatvector(as_tbl, geom = "geometry", crs = "EPSG:3857")
newvect

dieghernan/tidyterra documentation built on Feb. 20, 2025, 4:18 p.m.