GEE开发之下载海拔、坡度、坡向数据

前言：根据矢量图加载海拔、坡度、坡向和山体阴影。

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方法一：加载elevation、slope、aspect和hillshade数据

var geometry = ee.FeatureCollection('users/www1573979951/lh');
Map.centerObject(geometry,6);
var dataset = ee.Image("USGS/SRTMGL1_003")
var terrain = ee.Algorithms.Terrain(dataset);//海拔
var elevation = terrain.select('elevation');
//坡度
var slope = terrain.select('slope');
//坡向
var aspect = terrain.select('aspect');
//山体阴影
var hillshade = terrain.select('hillshade');Export.image.toDrive({image: elevation,   description: "elevation",fileNamePrefix: "elevation",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry});Export.image.toDrive({image: slope,   description: "slope",fileNamePrefix: "slope",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry});Export.image.toDrive({image: aspect,   description: "aspect",fileNamePrefix: "aspect",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry});Export.image.toDrive({image: hillshade,   description: "hillshade",fileNamePrefix: "hillshade",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry});

方法二：加载elevation、slope、aspect数据

var geometry = ee.FeatureCollection('users/www1573979951/hkh_boundary');
Map.centerObject(geometry,6);
var SRTM30 = ee.Image("NASA/NASADEM_HGT/001")var elevation = SRTM30.select('elevation').clip(geometry)
var slope = ee.Terrain.slope(elevation).clip(geometry)
var aspect = ee.Terrain.aspect(SRTM30).clip(geometry)Export.image.toDrive({image: elevation,   description: "elevation",fileNamePrefix: "elevation",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry });Export.image.toDrive({image: slope,   description: "slope",fileNamePrefix: "slope",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry });Export.image.toDrive({image: aspect,   description: "aspect",fileNamePrefix: "aspect",scale: 30, crs: "EPSG:4326",folder: 'dem',maxPixels: 1e13,region: geometry });