A High-Resolution Digital Bathymetric Elevation Model Derived from ICESat-2 for Adam's Bridge

A high-resolution Digital Bathymetric Elevation Model (DBEM) generated for the region, namely, Adam's Bridge, which encompasses a chain of shoals between Rameswaram Island, off the southeastern coast of Tamil Nadu, India, and Mannar Island, off the northwestern coast of Sri Lanka. The proposed dataset has taken advantage of the photon penetrability of the green laser of ICESat-2 LiDAR to derive the seafloor depth. Seafloor depths from ~0.2 million geolocated photons of ICESat-2 for the study area were accrued and interpolated to generate a 10 m digital bathymetric elevation model. Adam's Bridge, an isthmus and submerged reefal assemblage in shallow and supershallow waters, is a feature of scientific curiosity. Our dataset has the potential to enhance the understanding of Adam's Bridge structure by providing substantial information to reconstruct its evolution. The DBEM is in GeoTIFF file format with a cell size of 10 m (spatial resolution) projected in the Universal Transverse Mercator - UTM Zone 44N [EPSG:32644] coordinate system. The pixel values of the DBEM represent orthometric depth values (for the extent with sea water) and elevation values (for the extent with peninsula/land/islands) in meters.

本数据集为针对亚当桥（Adam's Bridge）海域构建的高分辨率数字水深高程模型（Digital Bathymetric Elevation Model, DBEM），该海域涵盖了印度泰米尔纳德邦东南海岸外的拉梅斯沃勒姆岛与斯里兰卡西北海岸外的曼纳尔岛之间的一系列浅滩。本数据集借助ICESat-2激光雷达的绿色激光光子穿透特性反演海底水深：收集了研究区内约20万颗ICESat-2地理定位光子对应的海底水深数据，并通过插值处理生成了空间分辨率为10米的数字水深高程模型。亚当桥作为浅海及超浅海区域的地峡与淹没礁体组合体，具有极高的科学研究价值。本数据集可提供丰富的演化重建信息，有助于深化对亚当桥构造特征的认知。该数字水深高程模型采用GeoTIFF文件格式存储，空间分辨率为10米，投影坐标系为通用横轴墨卡托（Universal Transverse Mercator, UTM）44N带【EPSG:32644】。模型像素值以米为单位，其中海水覆盖区域代表正高水深值，半岛、陆地或岛屿覆盖区域则代表高程值。