This file contains GPS data of individual Oystercatchers, linked to metadata on weather, sun/moon position, bathymetry and tidal information. For details, see main manuscript and its supplemental material.

ID: identifier of individual bird
DateTime: date and time in UTC
lat: latitude in decimal degrees
lon: longitude in decimal degrees
RDX: x-coordinate in Rijksdriehoekscoordinaten (Dutch national Cartesian grid) in metre
RDY: y-coordinate in Rijksdriehoekscoordinaten (Dutch national Cartesian grid) in metre
GPSHeight: bird's height as measured with GPS in metre
GPSSpeed: bird's speed as measured with GPS in m/s
GPSTemperature: temperature as measured with sensor on GPS device in Celcius
DateTimeString: date and time in UTC
TimeIntervalFix: time interval assigned to this fix in second
TimeRangeFix: time interval range in absolute time (seconds since 1 jan 1900)
ACCNBursts: number of accelerometer bursts (one burst contains a number of samples collected at 20 Hz)
ACCNSamples: number of accelerometer samples
ACCFractionActive: proportion of time the bird was active, as determined from accelerometer samples
ACCStdDevXYZ: tri-axial acceleration standard deviation (referred to as parameter gamma in supplemental material)
ACCMeanXYZ: mean tri-axial acceleration
ACCStdDevX: X-axis acceleration standard deviation, based on all ACC samples collected in interval TimeIntervalFix
ACCStdDevY: Y-axis acceleration standard deviation, based on all ACC samples collected in interval TimeIntervalFix
ACCStdDevZ: Z-axis acceleration standard deviation, based on all ACC samples collected in interval TimeIntervalFix
ACCMeanX: mean X-axis acceleration, based on all ACC samples collected in interval TimeIntervalFix
ACCMeanY: mean Y-axis acceleration, based on all ACC samples collected in interval TimeIntervalFix
ACCMeanZ: mean Z-axis acceleration, based on all ACC samples collected in interval TimeIntervalFix 
DayQ: True when day, False when night
SunDayNightLength: day length
SunPhase: phase of day or night, night runs from -1 to 0, day runs from 0 to 1
SunDayNightFraction: n/a
SunElevation: elevation in degrees above horizon
MoonQ: True when moon present, false when not
MoonDayNightLength: moon day length
MoonPhase: phase of moon, moon night runs from -1 to 0, moon day runs from 0 to 1
MoonDayNightFraction: n/a
MoonElevation: elevation in degrees above horizon
SeabedHeight: bathymetry in cm NAP
TidalHeight: height of the tides
EmersionTime: total duration of exposure in this tidal cycle
TimeSinceExposure: time since this patch has been exposed
MeanExposed: average exposure time for this patch (calculated as a multi-year average)
TidalPhase: tidal phase for this patch. emerged time runs from 0 to 1, submerged time runs from -1 to 0
WindDirection: wind direction, clockwise degrees from north, as obtained from a linearly distance-weighted average between meteorological stations De Kooij, Vlieland, Hoorn Terschelling and Lauwersoog.
WindSpeed: wind speed in m/s, distance-weighted station-average
Temperature: temperature, distance-weighted station-average
Sunshine: n/a
PrecipDuration: n/a
PrecipSum: n/a
CloudCover: n/a
DistanceTideLine: distance from the current tide line
LowDuration: duration of the low tide period, at the bird's current location. Tidal height 0 separates low from high tide.
TimeSinceLow: time passed since the onset of low tide, at the bird's current location
TidalPhaseLow: the tidal phase at the current bird's location. Tidal phase is 0 at the onset of low tide, and 1 at the onset of high tide.
RefTidalHeight: tidal height at the study area's central reference point (cf. Figure 1 main manuscript)
RefLowDuration: duration of low tide at the study area's central reference point
RefTimeSinceLow: time passed since the onset of low tide, at the study area's central reference point
RefTidalPhaseLow: the tidal phase at the study area's central reference point.
