The library includes the following metrics calculated from Moderate Resolution Imaging Spectroradiometer (MODIS) optical imagery (Level 1B 250M). 

VARIABLES:

MASK         = library of ice floe masks. Only available in the “.mat” file.
DATA_SIZE    = length scale of an ice floe, taken as the square root of its surface area [km].
x_STEREO     = x-coordinate of the centroid position of an ice floe on a Polar Stereographic North 70" N projection grid [m].
y_STEREO     = y-coordinate of the centroid position of an ice floe on a Polar Stereographic North 70" N projection grid [m].
LAT_POS      = centroid position of an ice floe in geographic latitude [deg].
LON_POS      = centroid position of an ice floe in geographic longitude [deg].
ICE_U_VEL    = daily ice u-velocity on a Polar-Stereographic grid [cm/s]. Positive indicates a northward displacement.
ICE_V_VEL    = daily ice v-velocity on a Polar-Stereographic grid [cm/s]. Positive indicates an eastward displacement.
ICE_ZETA_NORM= normalized daily rotation rate of an ice floe (rotation rate/ Coriolis parameter).
ELLIP        = ellipticity of an ice floe calculated from its shape (1- minor axis/major axis).
DAY          = day of the year when observation was acquired.
Year         = year when observation was acquired.