DESCRIPTION
Receiver-level summary of locations and detection activity for receivers used in the
Aberdeen Bay study array. Records are separated by study year and receiver/station.

COLUMNS

receiver_station_key
Composite key identifying a receiver/station combination within a study year.

receiver_year_key
Composite key identifying a receiver within a study year.

year
Study year.

receiver_id
Identifier of the acoustic receiver.

station
Receiver station name.

receiver_latitude
Receiver latitude in decimal degrees.

receiver_longitude
Receiver longitude in decimal degrees.

bottom_depth_m
Water/bottom depth at the receiver location in metres, where available.

receiver_depth_m
Deployment depth of the receiver in metres, where available.

first_detection
Date and time of the first retained study detection recorded for the receiver/year.

last_detection
Date and time of the last retained study detection recorded for the receiver/year.

detection_records
Number of retained detection records associated with the receiver/year.

detected_tags
Number of distinct acoustic transmitter IDs detected by the receiver/year.

physical_fish
Number of distinct physical fish detected by the receiver/year.

NOTES
A receiver may appear in more than one year. Composite key fields are included to
distinguish receiver records across years and stations.