Single-beam bathymetry data (ESRI ASCII grid format) of selected mesophotic biogenic reefs from the northern Adriatic Sea

These processed bathymetry grids were generated from single-beam sonar data collected in 2003-2007 as a part of ecological surveys carried out by the University of Bologna, Italy. The bathymetry data was acquired using a Lowrance HDS sonar operating at 200 kHz coupled with a WAAS-enabled D-GPS for navigation, and was processed by means of the kriging interpolation method using Surfer Golden Software. In most cases, the XY grid spacing was set at 0.5 m, but, in some cases according to areal coverage of data, was set to finer or coarser spacings: 1 m for TC2, Term14, TM1, TM4; 2 m for P208; and, 0.1 m for TSO. Depth values were tide-corrected and referred to the Mean Lower Low Water (MLLW) based on astronomical tide prediction (calculated by WXTide32 software using harmonic data for the nearest available station, i.e. Chioggia or Malamocco). The grid projection is in WGS84 / UTM Zone 33N (EPSG:32633). These bathymetry grids are provided in ESRI ASCII grid format and correspond to the annotated GeoTIFF images in the related data set. The lead investigator for this project was Massimo Ponti.

本数据集包含的经处理水深栅格数据（bathymetry grids），由意大利博洛尼亚大学2003-2007年开展生态调查时采集的单波束声呐数据生成。
本次水深数据采用工作频率为200 kHz的劳伦斯HDS（Lowrance HDS）声呐采集，并搭配支持广域增强系统（Wide Area Augmentation System, WAAS）的差分GPS（Differential GPS, D-GPS）完成导航定位；数据处理采用克里金插值法（kriging interpolation），借助Golden Software公司的Surfer软件完成。
多数场景下，XY方向栅格间距设为0.5 m；部分场景根据数据覆盖范围调整为更密或更疏的间距：TC2、Term14、TM1、TM4采用1 m间距，P208采用2 m间距，TSO采用0.1 m间距。
所有水深值均经过潮位校正，参考基于天文潮汐预报的平均低潮面（Mean Lower Low Water, MLLW）；该潮汐预报由WXTide32软件基于邻近观测站（即基亚奥贾港或马拉莫科港）的调和常数计算得到。
栅格投影采用WGS84 / UTM 33N带坐标系（EPSG:32633）。
本数据集的水深栅格以ESRI ASCII栅格格式（ESRI ASCII grid format）提供，与关联数据集中带注释的地理标记图像文件格式（GeoTIFF）图像一一对应。
本项目的首席研究员为马西莫·蓬蒂（Massimo Ponti）。