Gifford Marine Park Bathymetry - 30m Resolution Grid

Australia has established a network of 58 marine parks within Commonwealth waters covering a total of 3.3 million square kilometres, or 40 per cent of our exclusive economic zone (excluding Australian Antarctic Territory). These parks span a range of settings, from near coastal and shelf habitats to abyssal plains. Parks Australia manages the park network through management plans that came into effect for all parks on 1 July 2018. Geoscience Australia is contributing to their management by collating and interpreting existing environmental data, and through the collection of new marine data. “Eco-narrative” documents are being developed for those parks, where sufficient information is available, delivering collations and interpretations of seafloor geomorphology, oceanography and ecology. Many of these interpretations rely on bathymetric grids and their derived products, including those in this data release.\nBathymetry grids\nThe bathymetry of the marine parks was created by compiling and processing Geoscience Australia’s bathymetry data holding gridded at the optimum resolution depending of the vessel’s sonar system.\nThe bathymetry of the park is illustrated by a panchromatic geotiff image, developed by combining the bathymetric data with a hillshade image.\nMorphological Surfaces\nGeoscience Australia has developed a new marine seafloor classification scheme, which uses the two-part seafloor mapping morphology approach of Dove et al (2016). This new scheme is semi-hierarchical and the first step divides the slope of the seafloor into three Morphological Surface categories (Plain, 10°).\nDove, D., Bradwell, T., Carter, G., Cotterill, C., Gafeira, J., Green, S., Krabbendam, M., Mellet, C., Stevenson, A., Stewart, H., Westhead, K., Scott, G., Guinan, J., Judge, M. Monteys, X., Elvenes, S., Baeten, N., Dolan, M., Thorsnes, T., Bjarnadóttir, L., Ottesen, D. (2016). Seabed geomorphology: a twopart classification system. British Geological Survey, Open Report OR/16/001. 13 pages.\nThis research is supported by the National Environmental Science Program (NESP) Marine Biodiversity Hub through Project D1.

澳大利亚在联邦水域内建立了由58个海洋公园组成的网络，总面积达330万平方公里，占该国专属经济区（exclusive economic zone）的40%（不含澳大利亚南极领地）。这些公园涵盖从近岸、陆架生境到深海平原的多种生境类型。澳大利亚海洋公园管理局（Parks Australia）通过于2018年7月1日起对所有公园全面生效的管理计划，对该公园网络进行运营管理。澳大利亚地球科学局（Geoscience Australia）正通过整理、解读现有环境数据，以及采集新型海洋数据，为公园的管理工作提供支持。

"生态叙事文档（Eco-narrative）"正在为具备充足数据基础的公园进行编制，内容涵盖海底地貌学、海洋学与生态学数据的整理与解读。多数此类解读工作依赖于测深网格（bathymetric grids）及其衍生产品，包括本数据集发布中包含的相关产物。

### 测深网格（Bathymetry grids）
该海洋公园的测深数据通过整合并处理澳大利亚地球科学局的测深数据资产制作而成，网格分辨率根据搭载船舶的声呐系统的最优参数确定。该公园区域的测深情况以全色GeoTIFF（panchromatic GeoTIFF）图像呈现，该图像由测深数据与晕渲地貌（hillshade）图像融合生成。

### 地貌表面（Morphological Surfaces）
澳大利亚地球科学局开发了一套全新的海洋海底分类方案，该方案采用了Dove等人（2016）提出的双模块海底测绘地貌学方法。这套新方案为半层级结构，第一步将海底坡度划分为三类地貌表面类别（平原、10°）。

#### 参考文献
Dove, D.、Bradwell, T.、Carter, G.、Cotterill, C.、Gafeira, J.、Green, S.、Krabbendam, M.、Mellet, C.、Stevenson, A.、Stewart, H.、Westhead, K.、Scott, G.、Guinan, J.、Judge, M.、Monteys, X.、Elvenes, S.、Baeten, N.、Dolan, M.、Thorsnes, T.、Bjarnadóttir, L.、Ottesen, D.（2016）. 海底地貌学：双模块分类系统. 英国地质调查局，公开报告OR/16/001，共13页。

本研究由国家环境科学项目（National Environmental Science Program, NESP）海洋生物多样性中心通过D1项目资助。