Google Earth Engine——加拿大数字高程模型（CDEM）是加拿大自然资源部（NRCan）测高系统的一部分，源于现有的加拿大数字高程数据（CDED）

The Canadian Digital Elevation Model (CDEM) is part of Natural Resources Canada's (NRCan) altimetry system and stems from the existing Canadian Digital Elevation Data (CDED). In these data, elevations can be either ground or reflective surface elevations.

The CDEM is comprised of multiple DEMs with varying resolutions. These vary according to latitude and have a base resolution of 0.75 arc-seconds. For more information see the Product Specifications

Contains information licensed under the Open Government Licence – Canada.

加拿大数字高程模型（CDEM）是加拿大自然资源部（NRCan）测高系统的一部分，源于现有的加拿大数字高程数据（CDED）。在这些数据中，高程可以是地面高程，也可以是反射面高程。

CDEM是由多个分辨率不同的DEM组成的。这些数据因纬度而异，基本分辨率为0.75角秒。更多信息见产品规格

包含根据开放政府许可证-加拿大授权的信息。

Dataset Availability

1945-01-01T00:00:00 - 2011-01-01T00:00:00

Dataset Provider

NRCan

Collection Snippet

ee.ImageCollection("NRCan/CDEM")

Resolution

23.19 meters

Bands Table

* = Values are estimated

代码：

var dataset = ee.ImageCollection('NRCan/CDEM');
var elevation = dataset.select('elevation');
var elevationVis = {
  min: -50.0,
  max: 1500.0,
  palette: ['0905ff', 'ffefc4', 'ffffff'],
};
Map.setCenter(-139.3643, 63.3213, 9);
Map.addLayer(elevation, elevationVis, 'Elevation');