Google Earth Engine ——数据全解析专辑（Australian 5M DEM）澳大利亚5m DEM（局部）！

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 using a neighbourhood-mean method to 5 metre resolution datasets for each survey area, and then merged into a single dataset for each State. Each state's dataset is provided as a separate image within the image collection.

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. 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).

There are several areas close to Perth with null (NaN) values around (115.85, -31.99), (115.72, -33.75), and (115.10, -33.43).

源自 LiDAR 模型的澳大利亚数字高程模型 (DEM) 5 米网格代表了国家 5 米（裸地）DEM，该 DEM 源自 2001 年至 2015 年间约 236 次单独的 LiDAR 调查，覆盖面积超过 245,000 平方公里。这些调查涵盖澳大利亚人口稠密的沿海地区；墨累达令盆地内的洪泛区调查，以及主要和次要人口中心的个别调查。所有可用的 1 米分辨率 LiDAR 衍生的 DEM 都已使用邻域均值方法编译并重新采样到每个调查区域的 5 米分辨率数据集，然后合并为每个州的单个数据集。每个州的数据集在图像集合中作为单独的图像提供。

获得单独的 LiDAR 调查和 5m 产品的推导是澳大利亚地球科学、空间信息合作研究中心 (CRCSI)、气候变化和环境部、州和领地辖区之间长期合作的一部分，地方政府和墨累达令流域管理局在国家高程数据框架和沿海和城市 DEM 计划的支持下。源数据集的捕获标准与澳大利亚 ICSM LiDAR 采集规范基本一致，基本垂直精度至少为 0.30m（95% 置信度），水平精度至少为 0.80m（95% 置信度）。

珀斯附近有几个区域的空 (NaN) 值在 (115.85, -31.99)、(115.72, -33.75) 和 (115.10, -33.43) 附近。

Dataset Availability

2015-12-01T00:00:00 - 2015-12-01T00:00:00

Dataset Provider

Geoscience Australia

Collection Snippet

ee.ImageCollection("AU/GA/AUSTRALIA_5M_DEM")

Resolution

5 meters

Bands Table

引用：

Geoscience Australia, 2015. Digital Elevation Model (DEM) of Australia derived from LiDAR 5 Metre Grid. Geoscience Australia, Canberra.

代码：

var dataset = ee.ImageCollection('AU/GA/AUSTRALIA_5M_DEM');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: 0.0,
  max: 150.0,
  palette: ['0000ff', '00ffff', 'ffff00', 'ff0000', 'ffffff'],
};
Map.setCenter(140.1883, -35.9113, 8);
Map.addLayer(elevation, elevationVis, 'Elevation');