Google Earth Engine ——数据全解析专辑（DEM-S: Australian Smoothed Digital Elevation Model）澳大利亚1弧秒 DEM！

The Smoothed Digital Elevation Model (DEM-S) was derived from the SRTM data acquired by NASA in February 2000. DEM-S represents ground surface topography (excluding vegetation features) and has been smoothed to reduce noise and improve the representation of surface shape. An adaptive process applied more smoothing in flatter areas than hilly areas, and more smoothing in noisier areas than in less noisy areas.

This DEM-S supports calculation of local terrain shape attributes such as slope, aspect, and curvature that could not be reliably derived from the unsmoothed 1 second DEM because of noise.

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.

平滑数字高程模型 (DEM-S) 源自 NASA 于 2000 年 2 月获取的 SRTM 数据。DEM-S 表示地表地形（不包括植被特征），并已进行平滑处理以减少噪声并改善表面形状的表示。自适应过程在平坦区域比丘陵区域应用更多的平滑，在噪声较大的区域应用比在噪声较少的区域更多的平滑。

此 DEM-S 支持计算局部地形属性，例如坡度、坡向和曲率，这些属性由于噪声而无法可靠地从未平滑的 1 秒 DEM 导出。

有几个区域具有意外的负值：接近堪培拉（150.443044，-35.355281），值为-55，在西澳大利亚（124.84，-16.44）附近，值为-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-S")

Resolution

1 arc seconds

Bands Table

引用：

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

var dataset = ee.Image('AU/GA/DEM_1SEC/v10/DEM-S');
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');