Single platform, line transect, distance sampling (SPLT:DS)
Single platform, line transect, (SPLT)
Double platform, line transect, distance sampling (DPLT:DS)
Aerial digital stills (ADS)
Aerial digital video (ADV)
Aerial digital stills and video (ADSV)
Aerial observer, distance sampling (AODS)
Aerial observer, non-distance sampling (AO)
Single platform, line transect, distance sampling (SPLT:DS) Single platform, line transect, (SPLT) Double platform, line transect, distance sampling (DPLT:DS) Aerial digital stills (ADS) Aerial digital video (ADV) Aerial digital stills and video (ADSV) Aerial observer, distance sampling (AODS) Aerial observer, non-distance sampling (AO)