All survey numbers have some classification in municipal zones such as Coonoor or Kotagiri. Currently, the Nilgiris follow the classifications made in the gazette of 1993. If you intend to buy land for residential purposes, consider checking if it falls in the residential (PR) or multi-use zones (MUZ). Wooded zones have further restrictions when you wish to construct.
The panchayats in the Nilgiris are unplanned zones. Land classification is usually unclassified in a tea estate as tea is a plantation crop. Agriculture zones are demarcated only for specific spaces restricted to agriculture besides tea.