A vegetation type characterising a coastal swamp of brackish or saline water, in which specially adapted trees form a dense swamp forest
Data Dictionary for mangrove_poly: https://docs.topo.linz.govt.nz/data-dictionary/tdd-class-mangrove_poly.html
This layer is a component of the Topo50 map series. The Topo50 map series provides topographic mapping for the New Zealand mainland, Chatham and New Zealand's offshore islands, at 1:50,000 scale.
Further information on Topo50:
http://www.linz.govt.nz/topography/topo-maps/topo50
