Google Earth Engine ——資料全解析專輯（DEM-H: Australian SRTM Hydrologically Enforced Digital）澳洲1弧秒 DEM！

The Hydrologically Enforced Digital Elevation Model (DEM-H) was derived from the SRTM data acquired by NASA in February 2000. The model has been hydrologically conditioned and drainage enforced. The DEM-H captures flow paths based on SRTM elevations and mapped stream lines, and supports delineation of catchments and related hydrological attributes. The dataset was derived from the 1 second smoothed Digital Elevation Model (DEM-S; ANZCW0703014016) by enforcing hydrological connectivity with the ANUDEM software, using selected AusHydro V1.6 (February 2010) 1:250,000 scale watercourse lines (ANZCW0503900101) and lines derived from DEM-S to define the watercourses. The drainage enforcement has produced a consistent representation of hydrological connectivity with some elevation artefacts resulting from the drainage enforcement. A full description of the methods is in preparation (Dowling et al., in prep).

This product provides a DEM suitable for use in hydrological analysis such as catchment definition and flow routing.

There are several areas with unexpected negative values: close to Canberra around (150.443044, -35.355281) with values of -55 and in Western Australia around (124.84, -16.44) with -43.

水文強制數字高程模型 (DEM-H) 源自 NASA 于 2000 年 2 月擷取的 SRTM 資料。該模型已經過水文條件和排水強制。 DEM-H 根據 SRTM 高程和繪制的流線捕獲流徑，并支援流域和相關水文屬性的描繪。該資料集來自 1 秒平滑數字高程模型 (DEM-S; ANZCW0703014016)，通過使用標明的 AusHydro V1.6（2010 年 2 月）1:250,000 比例水道線（ANZCW0101390）和 ANUDEM 軟體加強水文連通性從 DEM-S 定義水道。排水執法産生了水文連通性的一緻表示，以及排水執法産生的一些高程人工制品。方法的完整描述正在準備中（Dowling 等人，準備中）。

該産品提供适用于水文分析的 DEM，例如集水區定義和流量演算。

有幾個區域具有意外的負值：接近堪培拉（150.443044，-35.355281），值為-55，而在西澳洲（124.84，-16.44）附近，值為-43。      

Dataset Availability

2010-02-01T00:00:00 - 2010-02-01T00:00:00

Dataset Provider

Geoscience Australia

Collection Snippet

ee.Image("AU/GA/DEM_1SEC/v10/DEM-H")

 This dataset is made available by Geoscience Australia under the Creative Commons Attribution 4.0 International Licence.

引用格式：

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

Resolution

1 arc seconds

Bands Table

Name	Description	Min*	Max*	Units
elevation	Elevation	-31.37	2223.24	Meters

 代碼：

var dataset = ee.Image('AU/GA/DEM_1SEC/v10/DEM-H');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -10.0,
  max: 1300.0,
  palette: [
    '3ae237', 'b5e22e', 'd6e21f', 'fff705', 'ffd611', 'ffb613', 'ff8b13',
    'ff6e08', 'ff500d', 'ff0000', 'de0101', 'c21301', '0602ff', '235cb1',
    '307ef3', '269db1', '30c8e2', '32d3ef', '3be285', '3ff38f', '86e26f'
  ],
};
Map.setCenter(133.95, -24.69, 5);
Map.addLayer(elevation, elevationVis, 'Elevation');
           

影像：