Land cover: it describes the extent of vegetation, water bodies, built environments, and bare natural surfaces (eg gravel and rock) across New Zealand
The exotic land cover indicator uses 10 detailed land cover classes in LCDB 5.0 grouped into the following four medium-level classes based on LAWA’s land cover classification hierarchy (see Factsheet: Land cover and why it is important):
The accuracy of change in area is typically plus or minus 10 percent for large changes and plus or minus 30 percent for small changes (Dymond et al., 2017)
The data comes from the New Zealand Land Cover Database (LCDB), which is a national classification of land cover and land use mapped using satellite imagery. Version 5.0 covers mainland New Zealand and the nearshore islands but not the Chatham Islands.
The LCDB has five major versions (1–5), correlating to the five summer survey periods – 1996/97, 2001/02, 2008/09, 2012/13, and 2018/19. The land cover classification was developed over the first three versions. Classification changes can be tracked to allow comparison between versions.