Satellite-derived bathymetry - Davis station, Vestfold Hills, 2012

1. Pre-processed satellite imagery [Davis Station_Preprocessed_WV2_Shallow Water.tif]IMPORTANT: This data cannot be shared due to licensing conditions and is provided for archival purposes only.Worldview-2 Imagery was provided at Processing level 2A in UTM 44S projection. The following Pre-processing steps were applied:1.    Radiometric Correction: Digital Numbers converted to TOA Reflectance2.    Atmospheric Correction: Dark Object Subtraction3.    Masking: Masking of Land and Ice features using classification of accompanying PAN imagery4.    Shallow Water Masking: Deep water masked out by thresh-holding the green and yellow bandsThe pre-processed data is provided as an 8-band Geotiff in UTM 44s with pixels of 2 m. 2. Satellite-derived bathymetry grid [Davis Station_SDB_utm44s_alat.tiff]This bathymetry dataset was produced by applying the SMART-SDB model to Worldview 2 Multispectral Image acquired on 20120118 at 04:52:17Z. Multibeam bathymetry data acquired in February-March 20101 using a Kongsberg EM 3002D MBES, with vertical and horizontal accuracy of 0.38m and 1.95m respectively, was used for both calibration and validation of the SMART-SDB model. Derived data was smoothed using a low pass filter, and manually cleaned for erroneous returns (however some may still exist). A description of the methods is available in the attached reports. Projection: UTM44STidal datum: ALAT (approximate lowest astronomical tide) Format: geotiff, ASCI xyz Depths Derived from Satellite Imagery. For SA awareness only. Not for Navigation. Vertical Accuracy is un-assessable and should be considered worse than ZOC C. Undetected features significant to surface navigation may exist.2. Bathymetry map (Davis Station SDB Chart_OFFICIAL.pdf)This map shows the hydrographic chart from Davis Station overlayed with the new satellite-derived bathymetry data. 4. Python Scripts and Guide These scripts were developed to automate extraction of satellite-derived bathymetry from the Worldview-2 imagery. Details of the scripts and how to apply them are outlined in the guide: Antarctica SDB Project How To.docx5. Final report [AASP4392_Antarctica SDB Project_FINAL_REPORT.docx]This report outlines the objectives, methods, results and conclusions for the satellite-derived bathymetry project (AASP4392). It has not been peer-reviewed.1 A collaborative Australian Hydrographic Service, Geoscience Australia and Australian Antarctic Division survey on the Howard Burton acquired multibeam bathymetry data using a Kongsberg EM 3002D MBES with vertical and horizontal accuracy of 0.38m and 1.95m respectively in the nearshore waters of the Vestfold Hills in February-March 2010. This survey is part of Australian Antarctic Project (AAP) 5093: Hydrographic Surveying and Seabed Characterisation (CI: Ursula Harris)The data was extracted from the Australian Hydrographic Office database (20100329 Hydrographic survey) and is available at: O'Brien, P.E. (2011) Coastal seabed mapping survey, Vestfold Hills, Antarctica, February-March 2010, Ver. 2, Australian Antarctic Data Centre https://data.aad.gov.au/metadata/records/Davis_multibeam_grids)

1. 预处理卫星影像 [Davis Station_Preprocessed_WV2_Shallow Water.tif]
重要提示：本数据因授权限制无法共享，仅用于存档用途。所用世界视图-2（WorldView-2）影像为通用横轴墨卡托（UTM）44S投影下的2A级处理产品。已执行以下预处理步骤：
1. 辐射校正：将数字数值转换为大气顶反射率（TOA Reflectance）
2. 大气校正：采用暗目标减法
3. 掩膜处理：通过配套全色（PAN）影像的分类结果，掩膜去除陆地与冰面特征
4. 浅海水域掩膜：通过对绿波段与黄波段设置阈值，掩膜去除深海水域
预处理后的数据为8波段地理标记图像文件格式（GeoTIFF），采用UTM 44S投影，像素分辨率为2米。
2. 卫星反演水深网格 [Davis Station_SDB_utm44s_alat.tiff]
本水深数据集基于2012年1月18日04:52:17Z获取的WorldView-2多光谱影像，通过SMART-SDB模型生成。校准与验证SMART-SDB模型所用数据为2010年2-3月获取的Kongsberg EM 3002D多波束测深系统（MBES）多波束水深数据，其垂直精度与水平精度分别为0.38米与1.95米。反演得到的数据经低通滤波平滑处理，并通过人工方式剔除错误回波（但仍可能存在少量残留错误）。相关方法细节可参阅附件报告。
投影：UTM 44S
潮汐基准面：ALAT（近似最低天文潮）
格式：GeoTIFF、ASCII XYZ
本水深数据由卫星影像反演得到，仅用于海事安全警示，不可用于航海导航。垂直精度未评估，且其精度应低于ZOC置信等级。可能存在对水面航行具有显著影响的未探测障碍物。
2. 水深地图（Davis Station SDB Chart_OFFICIAL.pdf）
本地图展示了戴维斯站（Davis Station）的水文航海图，并叠加了新的卫星反演水深数据。
4. Python脚本与操作指南
本脚本用于自动化提取WorldView-2影像中的卫星反演水深数据。脚本详情与使用方法可参阅指南文档《Antarctica SDB Project How To.docx》。
5. 最终报告 [AASP4392_Antarctica SDB Project_FINAL_REPORT.docx]
本报告阐述了卫星反演水深项目（AASP4392）的目标、方法、结果与结论，尚未经过同行评议。
1 本多波束水深数据由澳大利亚水文局、澳大利亚地球科学局与澳大利亚南极司联合开展的霍华德伯顿号（Howard Burton）科考船调查项目获取，于2010年2-3月在南极维斯弗德丘陵（Vestfold Hills）近岸水域使用Kongsberg EM 3002D多波束测深系统采集，其垂直精度与水平精度分别为0.38米与1.95米。本调查隶属于澳大利亚南极项目（AAP）5093：海底测绘与海床特征表征（项目负责人：Ursula Harris）。
本数据源自澳大利亚水文局数据库（20100329 水文调查），可于以下链接获取：O'Brien, P.E. (2011) 《南极维斯弗德丘陵海岸海床测绘调查（2010年2-3月，版本2）》，澳大利亚南极数据中心，https://data.aad.gov.au/metadata/records/Davis_multibeam_grids