Sea ice floe size and shape data from a very high resolution satellite image (Knox Coast, East Antarctica)

This dataset contains floe size distribution data from a very high resolution (pixel size: 0.3 m) optical satellite image of sea ice, acquired on 16. Feb. 2019 off the Knox Coast (East Antarctica). The image shows relatively small ice floes produced by wave-induced breakup of landfast ice between the Mill Island and Bowman Island. The ice floes are characterized by a narrow size distribution and angular, polygonal shapes, typical for sea ice broken by waves. The original image is divided into three sectors, labelled A, B and C, with different `populations' of ice floes in terms of their mean size and shape properties. The content of the dataset, for each sector: boundaries and position of each floe identified within that sector, geometric properties of each floe (surface area, minimum and maximum caliper diameter, rectangularity, minor and major axis of a fitted ellipse, etc.), an image illustrating the identified floes and their width. The data in points 1. and 2. above are available as Matlab .mat files, the detailed content of which is described in the readme.txt file, included in the main dataset folder. The image processing and object identification methods used to extract the floe data from the original image, as well as the background weather, wave and sea ice data allowing the reconstruction of sea ice-wave interactions that produced the observed sizes and shaped of ice floes, can be found in the following paper: Herman, A., Wenta, M., and Cheng, S. (2021) ‘Sizes and shapes of sea ice floes broken by waves - a case study from the East Antarctic coast’, Frontiers in Earth Science (submitted). Please cite this paper when using this dataset.

本数据集包含2019年2月16日获取的南极东部诺克斯海岸（Knox Coast）外海冰高分辨率光学卫星影像的海冰浮冰（sea ice floe）尺寸分布数据，该影像的像素实地尺寸为0.3米。该影像呈现了密尔岛（Mill Island）与鲍曼岛（Bowman Island）之间由波浪引发的固定冰（landfast ice）崩解所形成的相对小型海冰浮冰。这类浮冰具有狭窄的尺寸分布范围与棱角分明的多边形形态，属于波浪破碎海冰的典型特征。原始影像被划分为A、B、C三个分区，各分区内的海冰浮冰在平均尺寸与形态属性上存在不同的“种群”差异。针对每个分区，数据集包含以下内容：该分区内识别出的每块浮冰的边界与位置信息、每块浮冰的几何属性（包括表面积、最小与最大卡钳直径（caliper diameter）、矩形度（rectangularity）、拟合椭圆（fitted ellipse）的长短轴等），以及一张展示已识别浮冰及其宽度的影像。上述第1、2项内容以Matlab格式的.mat文件提供，其详细内容可参见主数据集文件夹内的readme.txt文件。从原始影像中提取浮冰数据所用的图像处理与目标识别方法，以及可用于重构引发观测浮冰尺寸与形态的海冰-波浪相互作用的背景气象、波浪与海冰数据，均可在以下论文中获取：Herman, A., Wenta, M., and Cheng, S. (2021) ‘Sizes and shapes of sea ice floes broken by waves - a case study from the East Antarctic coast’, Frontiers in Earth Science (submitted)。使用本数据集时，请引用该论文。