This data set is a collection of visual ship-based sea-ice observations carried out from the ship's bridge while the ship cruises through the sea ice. These observations have been standardized according to the ASPeCt protocol. These observations contain the ship's position, the day and time of the observation (hourly, with an observation radius around the ship of about 1 km), the total sea ice concentration, the partial concentrations of the three thickest sea ice types, and for these, respectively, thickness, type, degree of deformation, floe size, and snow properties and depth.
For more information see: http://www.aspect.aq
A tutorial allows to learn how sea-ice observations are carried out according to the ASPeCt protocol.
The two pictures at the top illustrate how the sea ice thickness is estimated by looking at the tilted ice floe and a scale attached to the ship's hull (in this case the research icebreaker Polarstern).