Digital Elevation Model (DEM) of Australia derived from LiDAR 5 Metre Grid

The Digital Elevation Model (DEM) 5 Metre Grid of Australia derived from LiDAR model represents a National 5 metre (bare earth) DEM which has been derived from some 236 individual LiDAR surveys between 2001 and 2015 covering an area in excess of 245,000 square kilometres. These surveys cover Australia's populated coastal zone; floodplain surveys within the Murray Darling Basin, and individual surveys of major and minor population centres. All available 1 metre resolution LiDAR-derived DEMs have been compiled and resampled to 5 metre resolution datasets for each survey area, and then merged into a single dataset for each State. These State datasets have also been merged into a 1 second resolution national dataset.

The acquisition of the individual LiDAR surveys and derivation of the 5m product has been part of a long-term collaboration between Geoscience Australia, the Cooperative Research Centre for Spatial Information (CRCSI), the Departments of Climate Change and Environment, State and Territory jurisdictions, Local Government and the Murray Darling Basin Authority under the auspices of the National Elevation Data Framework and Coastal and Urban DEM Program, with additional data supplied by the Australian Department of Defence. The source datasets have been captured to standards that are generally consistent with the Australian ICSM LiDAR Acquisition Specifications with require a fundamental vertical accuracy of at least 0.30m (95% confidence) and horizontal accuracy of at least 0.80m (95% confidence).

基于激光雷达（LiDAR）模型构建的澳大利亚5米格网数字高程模型（Digital Elevation Model, DEM）属于国家级5米（裸地球面）数字高程模型，其数据源自2001年至2015年间共计236次独立激光雷达测量作业，覆盖面积超过24.5万平方千米。此次测量覆盖了澳大利亚人口聚居的沿海区域、墨累-达令盆地内的泛滥平原，以及各大小居民点的专项测量。针对各测量区域，所有可用的1米分辨率激光雷达衍生数字高程模型均已完成整合，并重采样为5米分辨率数据集，随后按州域合并为单一组数据集。各洲域数据集进一步整合为1秒分辨率的国家级数据集。

本次独立激光雷达测量作业及5米分辨率产品的衍生工作，是在国家高程数据框架与沿海及城市数字高程模型项目的框架下，由澳大利亚地球科学局、空间信息合作研究中心（Cooperative Research Centre for Spatial Information, CRCSI）、气候与环境部、各州及领地管辖部门、地方政府与墨累-达令盆地管理局长期合作的一部分，额外数据由澳大利亚国防部提供。原始数据集的采集标准总体符合澳大利亚ICSM激光雷达采集规范，该规范要求基本垂直精度不低于0.30米（95%置信度），水平精度不低于0.80米（95%置信度）。

搜集汇总

背景与挑战

背景概述

该数据集是一个5米分辨率的澳大利亚全国数字高程模型（DEM），由236次LiDAR调查数据合并而成，覆盖面积超过245,000平方公里。数据具有高精度，垂直和水平精度分别达到0.30米和0.80米（95%置信度），适用于地形分析和环境研究。