projection_api: projection_api

In gcfrench/store: Store commonly used functions and lookups

projection_api

Description

This function returns the grid reference's projection, either as OSGB or OSNI.

Usage

projection_api(grid_reference, centre = FALSE)

Arguments

grid_reference

A Great British or Irish grid reference character string with class gridref.

Details

It can check either British or Irish grid references up to 10 figure (1m precision), including tetrads (2000m precision).

Value

The projection of the grid reference in British National Grid (OSGB) or Irish National Grid (OSNI).

REST API

A REST API endpoint is available once a Plumber router has been created and can be requested by adding _api to the end of the function.

The API returns "" instead of NULL so that it may be used with the dplyr::mutate function. Wrap the API call with dplyr::na_if to convert "" to NA.

suppressPackageStartupMessages({
  suppressWarnings({
    library(plumber)
  })
})
pr("../R/gridref_api.R") %>%
  pr_run(port = 8000)

See Also

Other grid reference functions: easting(), gridsquare_geometry(), hectad(), hectare(), monad(), northing(), pentad(), precision(), ten_metre(), tetrad()

Examples

 suppressPackageStartupMessages({
   suppressWarnings({
     library(dplyr)
     library(janitor)
   })
 })

 grid_references <- nbn_demonstration_dataset %>%
   clean_names() %>%
   slice_tail(n = 15) %>%
   select(grid_reference) %>%
   mutate(grid_reference = as_gridref(grid_reference))


# add projection column
suppressPackageStartupMessages({
  suppressWarnings({
    library(dplyr)
  })
})

grid_references %>%
  rowwise() %>%
  mutate(projection = projection(grid_reference))

gcfrench/store documentation built on May 17, 2024, 5:52 p.m.