igr_to_ig {igr}

Convert Irish grid references to Irish Grid coordinates

Description

igr_to_ig() converts Irish grid references into a list of Irish Grid (EPSG:29903) X and Y coordinates. The precision of each Irish grid reference in metres can be returned.

Usage

igr_to_ig(x, coords = c("x", "y"), precision = NULL)

Arguments

x

A character vector of Irish grid references. See igr_is_valid() for a definition of valid Irish grid references.

coords

A character vector of the names of the columns to contain the Irish Grid X and Y coordinates respectively.

precision

The name of the column to contain the precision of each Irish grid reference in metres, if required.

Value

A list containing Irish Grid X and Y coordinates and, optionally, the precision in metres of each Irish grid reference. Invalid or missing Irish grid references return NA.

Examples

# A vector of Irish grid references of different precisions
v <- c("N8090", "D1234588800", "W34", "")

# Convert to Irish Grid coordinates
igr_to_ig(v)

# Specify column names
igr_to_ig(v, coords = c("e", "n"))

# Also return the precision in metres of each Irish grid reference
igr_to_ig(v, precision = "prec")