Watch the development of the invasion through this animation which shows the establishment of wildings originating from the shelterbelt in each year from 2002 onwards:

• View the poster:
  Detecting and mapping invasive Pinaceae remotely in the South Island high country of New Zealand [5.8 Mb pdf]
  

• Read the paper:
  Dash, J.P., Watt, M.S., Paul, T.S.H., Morgenroth, J., Pearse, G.D., 2019. Early Detection of Invasive Exotic Trees Using UAV and Manned Aircraft Multispectral and LiDAR Data. Remote Sensing 11, 1812.
  https://doi.org/10.3390/rs11151812