Melt pond bathymetry of the MOSAiC floe derived by photogrammetry - spatially fully resolved pond depth maps of an Arctic sea ice floe

A newly developed method to derive melt pond bathymetry from aerial images allowed us to compile spatially fully resolved maps of pond depth on the MOSAiC floe from three measurement flights on 30 June, 17 July, and 22 July 2020. The pond bathymetry maps provide an unprecedented comprehensive insight into the spatial and temporal development of ponds and their geometry. They were derived to better understand pond evolution, determine the volume of water contained in the ponds, and eventually obtain improved parameterizations for ponds. The data is provided in GeoTIFF raster format, with every pixel in ponds containing the depth at that location in meters, downward negative. Pond bathymetry was calculated from orthomosaics and digital elevation models processed from helicopter aerial images collected on MOSAiC floe grid surveys.
Pond bathymetry is stored in GeoTIFFs, containing pond depth in meters, in the negative downward direction. Only regions classified as ponds with the classification algorithm PASTA-ice are included. Some pond-like objects on the floe were classified as submerged ice/open water due to their visual appearance or connection to the floe edge and are therefore not included. The raster data is projected in WGS 84 / NSIDC Sea Ice Polar Stereographic North (EPSG:3413). It was derived from the orthomosaics and DEMs presented in doi:10.1594/PANGAEA.949433 and can therefore be overlaid directly with this data.

本研究依托一种全新开发的航空影像反演融池水深测深（melt pond bathymetry）方法，基于2020年6月30日、7月17日及7月22日的三次飞行测量作业，绘制了MOSAiC浮冰上空间全解析的融池水深地图。该融池水深测深地图可为理解融池的时空演化过程及其几何特征提供前所未有的全面认知。本数据集的构建初衷为更深入地解析融池演化规律、精准测算融池储水量，并最终优化融池的参数化方案。数据集以GeoTIFF栅格格式提供，融池内每个像素的数值代表该位置的水深，单位为米，以向下为负方向。融池水深测深数据通过对MOSAiC浮冰网格调查获取的直升机航空影像处理得到的正射影像镶嵌图（orthomosaics）与数字高程模型（digital elevation models, DEM）计算得到。
融池水深测深数据存储于GeoTIFF文件中，水深值以米为单位，以向下为负方向，仅包含通过PASTA-ice分类算法识别为融池的区域。部分浮冰上的类融池地物因视觉特征或与浮冰边缘相连，被归类为水下冰/开阔水域，因此未被纳入本数据集。该栅格数据采用WGS 84/NSIDC海冰北极立体投影北（WGS 84 / NSIDC Sea Ice Polar Stereographic North, EPSG:3413）坐标系。本数据集源自DOI:10.1594/PANGAEA.949433中公开的正射影像镶嵌图与数字高程模型，因此可直接与该公开数据进行叠加分析。