An authorised person may, for the purpose of ascertaining whether land is suitable for a public purpose or of obtaining information in relation to land that, in the opinion of the authorised person, is, or may be, suitable for a public purpose—
(a) enter upon the land, or upon adjoining land, with such persons, vehicles and things as are reasonably necessary for the purpose; and
(b) make surveys, take levels, dig or bore into the land, examine the soil and do, in relation to the land, any other thing reasonably necessary for the purpose.