National Environmental Research Program - Seafloor map of the Flinders Commonwealth MPA

A comprehensive and detailed multibeam sonar-based map of the shelf-break region of the Central Flinders Commonwealth Marine Reserve (CMR). It illustrates the extent that several canyon-head incisions are present in this region, and that inset from the shelf-break is a relatively extensive area of cross-shelf reef. Some of the canyon-head incisions are characterised by exposed reef areas, and these are indicated by localised regions of rapid change in depth. The cross-shelf reef is generally very low profile, but characterised by distinct reef ledges where bedding planes in the sedimentary rock types have eroded. These ledges, often between 1-2 m in height, can run for several kilometres as distinct features. The method of data extraction is based on Lucieer (2013). Three are three classes of seafloor map- one from GEOBIA, one from digitisation and one from Probability of Hardness based on Angular Profile Correction.Lucieer, V (2013) NERP broad-scale analysis of multibeam acoustic data from the Flinders Commonwealth Marine Reserve, Prepared for the National Environmental Research Program. Internal report. IMAS, Hobart, TAS [Contract Report]

本数据集为弗林德斯中部英联邦海洋保护区（Commonwealth Marine Reserve, CMR）陆坡带（shelf-break）区域的综合详细多波束声呐（multibeam sonar）测绘图。本图不仅展示了本区域内多处峡谷头部切入地貌的分布范围，还通过陆坡带区域的内嵌插图，标明了一片规模相对较大的跨陆架礁（cross-shelf reef）区域。部分峡谷头部切入地貌发育有裸露礁体，这类裸露礁体以局部深度快速变化的区域进行标注。跨陆架礁整体地势低矮平缓，其特征为发育有清晰的礁台——沉积岩的层理面经侵蚀作用形成此类礁台。这类礁台高度通常介于1至2米之间，可作为显著地貌单元延伸数公里。本数据集的数据提取方法参考Lucieer（2013）的研究成果。本次海底制图共包含三类成果：分别基于面向对象影像分析（Geographic Object-Based Image Analysis, GEOBIA）、数字化描记，以及基于角度剖面校正的硬度概率模型生成。Lucieer V（2013）：《弗林德斯英联邦海洋保护区多波束声学数据的国家环境研究计划（National Environmental Research Program, NERP）大范围分析》，为国家环境研究项目编制的内部报告，塔斯马尼亚州霍巴特市海洋与南极研究所（Institute for Marine and Antarctic Studies, IMAS）[合同报告]