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Transform coordinates in a data.table and appends new EPSG-Suffixed columns

Source: R/fun_transform_dt.R
atl_transform_dt.Rd

Transforms coordinate columns in a data.table from one CRS to another using sf, and appends the transformed coordinates as new columns. The new columns are automatically named using the original column names suffixed with the EPSG code of the target CRS (e.g., x_4326, y_4326). Original coordinates are preserved.

Usage

atl_transform_dt(
  data,
  x = "x",
  y = "y",
  from = sf::st_crs(32631),
  to = sf::st_crs(4326)
)

Arguments

data

A data.table containing coordinate columns.

x

A character string specifying the column with x-coordinates. Defaults to "x".

y

A character string specifying the column with y-coordinates. Defaults to "y".

from

An sf::st_crs object representing the source coordinate reference system. Defaults to EPSG:32631.

to

An sf::st_crs object representing the target coordinate reference system. Defaults to EPSG:4326.

Value

A data.table identical to the input but with two new columns containing the transformed coordinates.

Examples

# packages
library(tools4watlas)

# example with bbox from data and movement data
data <- data_example

# add transformed coordinates in projection of the base map (EPSG:4326)
data <- atl_transform_dt(data)