GEE下载哨兵2A（Sentinel-2A）数据

老少爷们copy吧，最好自己敲一遍

var image = ee.ImageCollection('COPERNICUS/S2_SR')

       .filterDate('2020-01-01','2020-12-31')

       .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE',10))

       .filterBounds(roi)

       .median()

//set visualization parameter for sentinel 2A image

var visParamsTrue = {bands:['B4','B3','B2'],min:0,max:2500,gamma:1.1};

Map.addLayer(image,visParamsTrue,"sentinel 2A");

var studyarea = image.clip(roi);

Map.addLayer(studyarea,visParamsTrue,"studyarea");

//export to drive

Export.image.toDrive({

image:studyarea.int16(),

description:'xining',

scale:10,

region:roi,

maxPixels:1e13

});