20210930 14433000 1.0 TRUE An Average Densities Recreational Vessels Recreational vessel densities based on information collected by NIWA using aerial surveys. Data used to create this layer includes the 12 month period from Dec 2004 – Dec 2005 and the period 2/10/2011 to 16/9/2012. Ministry for Primary Industries (MPI) - Manatū Ahu Matua National Institute of Water and Atmospheric Research (NIWA) – Taihoro Nukurangi