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Get CRS information from an sf layer's geometry column

Source: R/sf_utils.R
get_layer_crs.Rd

Returns a list with the EPSG code (integer or NA) and WKT string for the coordinate reference system of the geometry column. Known CRS inputs are normalized to WGS84 in the geom_sf() IR path; missing CRS layers warn that coordinates will be serialized as-is.

Usage

get_layer_crs(df)

Arguments

df

A data.frame from ggplot_build()$data[[i]] containing an sfc column

Value

A list with fields:

  • epsg: integer EPSG code, or NA_integer_ if not available

  • wkt: character WKT2 string, or NA_character_ if not available