Google Earth Engine——Arctic北极DEM是一个数字表面模型（DSM），描绘了包括植被、树冠、建筑物和其他人造表面特征在内的第一回的高程值，2米/5米分辨率

ArcticDEM is a digital surface model (DSM) that portrays first-return elevation values that include vegetation, tree canopy, buildings, and other man-made surface features. The 2m asset is a collection of strips rather than a single mosaic due to projection differences between strips.

Strip DEM files correspond to the overlapping area of the input stereopair image swaths as they are collected by DigitalGlobe’s constellation of polar-orbiting satellites. Strip DEM dimensions will vary according to the satellite sensor that acquired the images and the off-nadir angle of collection. Most strips are between 16km and 18km in width, and 110km and 120km in length.

ArcticDEM是一个数字表面模型（DSM），描绘了包括植被、树冠、建筑物和其他人造表面特征在内的第一回的高程值。由于条带之间的投影差异，2米分辨率是一个条带的集合，而不是一个单一的镶嵌。

条状DEM文件对应于输入的立体影像扫描的重叠区域，因为它们是由DigitalGlobe的极地轨道卫星群收集的。带状DEM的尺寸将根据获取图像的卫星传感器和收集的偏离天顶的角度而变化。大多数条带的宽度在16公里到18公里之间，长度在110公里到120公里之间。

Dataset Availability

2009-08-16T00:00:00 - 2017-03-12T00:00:00

Dataset Provider

University of Minnesota Polar Geospatial Center

Collection Snippet

ee.ImageCollection("UMN/PGC/ArcticDEM/V2/2m")

Resolution

2 meters

Bands Table

• Bit 0: Pixel processing
  • 0: Pixels have been interpolated
  • 1: Pixels are derived from a stereo match

使用说明：

National Science Foundation (PGC’s primary funding source) policy requires researchers to acknowledge NSF support in all publications, web pages, and media interviews.

By using PGC data in Earth Engine, users agree to cite PGC and its sponsorship by the NSF. The original source of any third-party data supplied by PGC must also be properly attributed.

For more information see the PGC's Acknowledgement Policy.

引用：

DEM(s) created by the Polar Geospatial Center from DigitalGlobe, Inc. imagery.

代码：

var dataset = ee.ImageCollection('UMN/PGC/ArcticDEM/V2/2m');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -50.0,
  max: 1000.0,
  palette: ['0d13d8', '60e1ff', 'ffffff'],
};
Map.setCenter(-63.402, 66.368, 7);
Map.addLayer(elevation, elevationVis, 'Elevation');

其他版本：

UMN_PGC_ArcticDEM_V2_5m

var dataset = ee.Image('UMN/PGC/ArcticDEM/V2/5m');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -50.0,
  max: 1000.0,
  palette: ['0d13d8', '60e1ff', 'ffffff'],
};
Map.setCenter(-63.402, 66.368, 7);
Map.addLayer(elevation, elevationVis, 'Elevation');

UMN_PGC_ArcticDEM_V3_2m

var dataset = ee.ImageCollection('UMN/PGC/ArcticDEM/V3/2m');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -50.0,
  max: 1000.0,
  palette: ['0d13d8', '60e1ff', 'ffffff'],
};
Map.setCenter(-63.402, 66.368, 7);
Map.addLayer(elevation, elevationVis, 'Elevation');

UMN_PGC_ArcticDEM_V3_2m_mosaic

var dataset = ee.Image('UMN/PGC/ArcticDEM/V3/2m_mosaic');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -50.0,
  max: 1000.0,
  palette: ['0d13d8', '60e1ff', 'ffffff'],
};
Map.setCenter(-63.402, 66.368, 7);
Map.addLayer(elevation, elevationVis, 'Elevation');