Converts a vector of state names to an ISO 3166-2 two character state codes.
stateToCode(stateNames, countryCodes = NULL, dataset = "NaturalEarthAdm1")
Vector of state names to be converted.
Vector of ISO 3166-2 alpha-2 country codes the state might be found in.
Name of dataset containing state-level identifiers.
A vector of ISO 3166-2 codes or NA.
For this function to work, you must install and load the "NaturalEarthAdm1" dataset.
convertNaturalEarthAdm1
if (FALSE) {
stateToCode("Washington")
stateToCode("Barcelona")
stateToCode("Shandong")
}