generates a crosswalk file inclusive of all geography levels possible that exist in geoids. param: geoids(character vector) -> geoids to get crosswalk for. return: dataframe of relationship data. columns: geoid10, geoid20, area10, area20, area_part, type_change
create_crosswalk.Rdgenerates a crosswalk file inclusive of all geography levels possible that exist in geoids. param: geoids(character vector) -> geoids to get crosswalk for. return: dataframe of relationship data. columns: geoid10, geoid20, area10, area20, area_part, type_change