Darwin Harbour Habitat Mapping Program: Backscatter variance

This resource contains a GLCM (Grey-Level Co-occurrence Matices) variance 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 GLCM (Grey-Level Co-occurrence Matices) variance 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 statistic is a measure of local heterogeneity or dispersion around the mean. The variance increases when the neighbouring values differ from their mean.

本资源包含达尔文港及周边区域后向散射数据的灰度共生矩阵（GLCM, Grey-Level Co-occurrence Matices）方差网格，该网格是达尔文港与拜诺港基线海床测绘项目的组成部分。该项目由INPEX牵头的Ichthys液化天然气（LNG）项目向澳大利亚北领地政府环境与自然资源部（NTG-DENR）提供的补偿资金资助，并获澳大利亚地质科学局（GA）与澳大利亚海洋科学研究所（AIMS）联合投资。本项目旨在通过整理和收集基线数据，提升对达尔文港与拜诺港区域海洋环境的认知，为构建专题栖息地地图及支撑海洋资源管理决策的信息奠定基础。后向散射数据的GLCM方差网格源自2011至2017年间GA、AIMS及NTG-DENR开展的多项调查成果汇编，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GA、AIMS及NTG-DENR此前开展的GA0333调查数据。该统计量用于衡量局部异质性或均值周围的离散程度。当相邻数值偏离其均值时，方差会增大。