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

This resource contains a Local Moran's I grid of the bathymetry 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 bathymetry 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 previous surveys GA4425 and GA0333 collected by GA, AIMS, NTG-DENR and Darwin Port Authority. This data measures Local Moran's I of the bathymetry 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区域水深数据的局部莫兰指数（Local Moran's I）格网，该成果为达尔文港与拜诺港海底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）项目提供补偿资金，资助北领地政府环境与自然资源部（Northern Territory Government’s Department of Environment and Natural Resources, NTG-DENR），并由澳大利亚地质调查局（Geoscience Australia, GA）与澳大利亚海洋科学研究所（Australian Institute of Marine Science, AIMS）共同出资参与。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，以此生成专题生境地图及相关信息，为海洋资源管理决策提供支撑。本次水深数据的局部莫兰指数格网，由GA、AIMS与NTG-DENR在2011至2017年间开展的多轮勘测数据汇编得到，涉及航次包括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）；同时纳入了此前由GA、AIMS、NTG-DENR与达尔文港务局（Darwin Port Authority）完成的GA4425与GA0333航次数据。该数据集用于表征水深数据的局部莫兰指数。局部莫兰指数用于反映局域范围内的空间自相关性：局部莫兰指数的正值（负值）越大，表明其正（负）空间自相关性越强；数值接近零时则代表空间分布随机或不存在空间自相关。