Bi = DISTANCE sampling point transect, mainly for birds
DT = DISTANCE sampling line transect, mainly for butterflies, reptiles and amphibians
TW = DISTANCE sampling trapping webs, mainly for ground-living insects
5 lines from A to E 5 rows from 1 to 5
For Observation_Type = Bi: survey time in minutes
For Observation_Type = DT: length of transect in meters
For Observation_Type = TW: trapping time in minutes