Darwin Harbour Habitat Mapping Program: Backscatter Local Moran's I

This resource contains a Local Moran's I grid of the backscatter data for the greater Darwin Harbour region as part of a baseline seabed mapping program of Darwin Harbour and Bynoe Harbour. This project was funded through offset funds provided by an INPEX-led Ichthys LNG Project to the Northern Territory Government’s Department of Environment and Natural Resources (NTG-DENR) with co-investment from Geoscience Australia (GA) and the Australian Institute of Marine Science (AIMS). The intent of this program is to improve knowledge of the marine environments in the Darwin and Bynoe Harbour regions by collating and collecting baseline data that enable the creation of thematic habitat maps and information to underpin marine resource management decisions. The Local Moran's I grid of the backscatter data was derived from a compilation of multiple surveys undertaken by GA, AIMS and NTG-DENR between 2011 and 2017, including GA0333 (Siwabessy et al., 2015), GA0341 (Siwabessy et al., 2015), GA0351/SOL6187 (Siwabessy et al., 2016), GA4452/SOL6432 (Siwabessy et al., 2017), GA0356 (Radke et al., 2017), and GA0358 and GA0359 (Radke et al., 2018), adding to those from a previous survey GA0333 collected by GA, AIMS and NTG-DENR. This data measures Local Moran's I of the backscatter data. The Local Moran's I indicates spatial autocorrelation within a local area. A large positve (negative) value of the Local Moran's I indicates positive (negative) spatial autocorrelation. A value close to zero indicates randomness or no spatial autocorrelation.

本数据集包含大达尔文港（Greater Darwin Harbour）区域后向散射数据的局部莫兰I指数（Local Moran's I）网格，该成果是达尔文港与拜诺港（Bynoe Harbour）海底底床基线测绘项目的组成部分。本项目由INPEX牵头的伊奇斯液化天然气（Ichthys LNG）项目向北领地政府环境与自然资源部（NTG-DENR）提供的补偿资金资助，并得到澳大利亚地球科学局（Geoscience Australia, GA）与澳大利亚海洋科学研究所（Australian Institute of Marine Science, AIMS）的联合投资。本项目旨在通过整理与采集基线数据，深化对达尔文港及拜诺港海域海洋环境的认知，进而生成专题生境地图并提供支撑海洋资源管理决策的相关信息。本次用于生成局部莫兰I指数网格的后向散射数据，整合了GA、AIMS与NTG-DENR在2011至2017年间开展的多轮勘测数据，包括GA0333（Siwabessy等，2015）、GA0341（Siwabessy等，2015）、GA0351/SOL6187（Siwabessy等，2016）、GA4452/SOL6432（Siwabessy等，2017）、GA0356（Radke等，2017）以及GA0358与GA0359（Radke等，2018），并补充了此前由GA、AIMS与NTG-DENR开展的GA0333勘测数据。本数据集用于表征后向散射数据的局部莫兰I指数值。局部莫兰I指数可反映局部区域的空间自相关性：当其取值为较大正值（负值）时，代表该区域存在正（负）空间自相关性；当其取值接近零时，则表明该区域的空间分布呈随机状态，无显著空间自相关性。