The NVR Map shows rural land where clearing of native vegetation can occur without approval and rural land where clearing requires approval. Broadly, category 1 is land that was cleared of native vegetation as at 1 January 1990, or land that was lawfully cleared between 1 January 1990 and 25 August 2017. Category 2 is land that was not cleared as at 1 January 1990, was unlawfully cleared after 1 January 1990, or is a prescribed area with an identified environmental value. Land is mapped to each category on the basis of past clearing or disturbance events, as detected by satellite and aerial imagery, and updated land use data. Prescribed areas with an identified environmental value are mapped as category 2, overriding a category 1 designation based on the mapping.