Digital Elevation Model (DEM) 25 Metre Grid of Australia derived from LiDAR

The Digital Elevation Model (DEM) 25 Metre Grid of Australia derived from LiDAR model represents a National 25 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 25 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.

基于激光雷达（LiDAR）模型构建的澳大利亚25米格网数字高程模型（Digital Elevation Model, DEM）为国家级25米（裸地球面）数字高程模型，其数据源自2001年至2015年间开展的约236次独立激光雷达测量，覆盖总面积超过24.5万平方千米。该批测量覆盖澳大利亚人口密集的沿海区域、墨累-达令盆地内的泛滥平原，以及各大小人口聚居区的专项测量。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已完成整合并重采样至25米分辨率数据集，随后按各州合并为单一组态数据集。上述各州级数据集进一步整合为1秒分辨率的国家级数据集。