Herein contains descriptors for all variables used in quantifying orographic lift encountered by GPS tracked herring gulls and lesser black-backed gulls

ID, Unique identification number linking data point to original position in UvA-BiTS database, int
device_info_serial, Identification number unique to each individual bird, int
date_time, Full date and time at which GPS measurement was taken, string
year, Year in which GPS measurement was taken, int
month, Month in which GPS measurement was taken, int
day, Day in which GPS measurement was taken, int
hour, Hour in which GPS measurement was taken, int
minute, Minute in which GPS measurement was taken, int
second, Second in which GPS measurement was taken, int
n_obs_day, Day in the year in which GPS measurement was taken (1 = 1st Jan), int
longitude, Longitude measurement of GPS position, float 
latitude, latitude measurement of GPS position, float
altitude, altitude in metres (above sea level) of GPS position, int
temperature, Temperature (deg C) measured by GPS, float
gps_fixtime, Time taken for GPS to make fix, float
speed_2d, instantaneous speed measured by GPS in m/s, float 
altitude_agl, altitude in metres above ground level, int
positiondop, Positional DOP (Dilution of Precision), unitless
satellites_used, number of satellites used to make fix, int
project, project to which datapoint is assigned (indicates species), string 
oroglift_max, maximum orographic lift measured in 22.5m by 22.5m cell in m/s, float
oroglift_mean, mean orographic lift measured in 22.5m by 22.5m cell in m/s, float 
oroglift_min, minimum orographic lift measured in 22.5m by 22.5m cell in m/s, float 
dem_alt_max, maximum elevation from DEM measured in 22.5m by 22.5m cell in m, float
dem_alt_mean, mean elevation from DEM measured in 22.5m by 22.5m cell in m, float
dem_alt_min, minimum elevation from DEM measured in 22.5m by 22.5m cell in m, float
wspeed, wind speed in m/s at time of measurement, int 
wdir, wind direction in deg from North at time of measurement, int
wstation, identification number of weather station used for wind measurements, int
asp_mode, mode aspect in degrees from North of landscape in 22.5m by 22.5m grid, int
asp_std, standard deviation of aspects used in 22.5m by 22.5m grid, float 
first_index, the index of the first measurement of a segment from accelerometer behaviour classifier, int
class_id, identification number of accelerometer derived behaviour from 10 behaviour algorithm, int
class_name, identification name of accelerometer derived behaviour from 10 behaviour algorithm, string 
class_red, classification number to separate non flight behaviour from flight behaviour, int 
class_green, classification number to separate behaviours in 10 behaviour algorithm, int
class_blue, classification number to separate behaviours in 10 behaviour algorithm, int
gpsspeed, instantaneous speed measured by GPS in m/s, float 
longitude_UTM, longitude converted to UTM coordinates, float 
latitude_UTM, latitude converted to UTM coordinates, float 
altitude_adl, altitude calculated above DEM height in m (more accurate than altitude_agl), float 
trip, identification number of individual trip, int 
timestep, time difference calculated between points in seconds, float 
pp, point to point distance in metres, float
ppvel, point to point velocity in m/s, float 
dest, logical as to whether point is locatated at destination (1 for destination and 0 for between destinations), logical 
Rlatitude, latitude of equivalent random point, float 
Rlongitude, longitude of equivalent random point, float 
tripSect, indentification number for section of trip which indicates between destination journeys, int 
Roroglift_max, Random point maximum orographic lift measured in 22.5m by 22.5m cell in m/s, float
Roroglift_mean, Random point mean orographic lift measured in 22.5m by 22.5m cell in m/s, float 
Roroglift_min, Random point minimum orographic lift measured in 22.5m by 22.5m cell in m/s, float 
Rdem_alt_max, Random point maximum elevation from DEM measured in 22.5m by 22.5m cell in m, float
Rdem_alt_mean, Random point mean elevation from DEM measured in 22.5m by 22.5m cell in m, float
Rdem_alt_min, Random point minimum elevation from DEM measured in 22.5m by 22.5m cell in m, float
Rwspeed, Random point wind speed in m/s at time of measurement, int 
Rwdir, Random point wind direction in deg from North at time of measurement, int
Rwstation,Random point  identification number of weather station used for wind measurements, int
Rasp_mode, Random point mode aspect in degrees from North of landscape in 22.5m by 22.5m grid, int
Rasp_std, Random point standard deviation of aspects used in 22.5m by 22.5m grid, float 
Rlongitude_UTM, Random point longitude converted to UTM coordinates, float
Rlatitude_UTM, Random point latitude converted to UTM coordinates, float 
orog_lift_mean_TI, Seasonal orographic lift associated to real GPS point, float
Rorog_lift_mean_TI, Seasonal orographic lift associated to random GPS point, float