| ReproSurID | | Physical quantity | Unique identification |
| SurveyDate | | Date/time | Date survey was conducted |
| Watershed | | Nominal | Usually agrees with ‘Watershed’, not used for incidental observations |
| Observer | | Nominal | Unique code for technicians |
| StartTime | | Date/time | Time at beginning of survey |
| IncidentalObs | | Nominal | TRUE if bird was detected outside traditional survey, i.e.: off plot or during transport |
| SurDuration | | Physical quantity | Length of survey |
| Temperature | | Physical quantity | Temperature at beginning of survey |
| Wind | | Physical quantity | Category of wind based off Beaufort Scale |
| Cloud | | Physical quantity | Percent of sky covered by clouds |
| Precipitation | | Nominal | Categorical distinction of ambient moisture |
| NMaleGRSP | | Physical quantity | NMaleGRSP |
| PositionRegion | | Nominal | UTM Zone |
| PositionX | | Physical quantity | Easting (latitude) |
| PositionY | | Physical quantity | Northing (longitude) |
| ReproDataID | | Physical quantity | Unique identification |
| ColorBands | | Nominal | Unique 4 color leg-band pattern |
| RI | | Physical quantity | Reproductive Index |
