Google Earth Engine ——資料全解析專輯（Australian 5M DEM）澳洲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 模型的澳洲數字高程模型 (DEM) 5 米網格代表了國家 5 米（裸地）DEM，該 DEM 源自 2001 年至 2015 年間約 236 次單獨的 LiDAR 調查，覆寫面積超過 245,000 平方公裡。這些調查涵蓋澳洲人口稠密的沿海地區；墨累達令盆地内的洪泛區調查，以及主要和次要人口中心的個别調查。所有可用的 1 米分辨率 LiDAR 衍生的 DEM 都已使用鄰域均值方法編譯并重新采樣到每個調查區域的 5 米分辨率資料集，然後合并為每個州的單個資料集。每個州的資料集在圖像集合中作為單獨的圖像提供。

獲得單獨的 LiDAR 調查和 5m 産品的推導是澳洲地球科學、空間資訊合作研究中心 (CRCSI)、氣候變化和環境部、州和領地轄區之間長期合作的一部分，地方政府和墨累達令流域管理局在國家高程資料架構和沿海和城市 DEM 計劃的支援下。源資料集的捕獲标準與澳洲 ICSM LiDAR 采集規範基本一緻，基本垂直精度至少為 0.30m（95% 置信度），水準精度至少為 0.80m（95% 置信度）。

珀斯附近有幾個區域的空 (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

Name	Description	Units
elevation	Elevation	Meters

引用：

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

代碼：

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');