GEE批量下载（以modis ndvi为例）

//研究区

var roi = ee.FeatureCollection(".......").geometry();

//重投影函数

var re=function (image) {

return image.reproject('EPSG:4326',null, 500);

}

//批量下载函数

function exportImage(image, region, fileName) {

Export.image.toDrive({

image: image,

description: "Drive-image-"+fileName,

fileNamePrefix: fileName,

folder: "modis_ndvi", //保存的文件夹

scale: 500, //分辨率

region: region,

maxPixels: 1e13,

crs: "EPSG:4326"

});

}

//加载数据集

var data = ee.ImageCollection("MODIS/006/MOD13A2");

Map.centerObject(roi, 6);

//筛选数据

var data_selected = data.filterBounds(roi)

.filterDate("2020-6-1", "2020-7-1")

.select('NDVI')

.map(re);

print("data_selected", data_selected);

//生成列表，迭代下载

var indexList = data_selected.reduceColumns(ee.Reducer.toList(), ["system:index"]).get("list");

print("indexList", indexList);

indexList.evaluate(function(indexs) {

for (var i=0; i<indexs.length; i++) {

var image = data_selected.filter(ee.Filter.eq("system:index", indexs[i]))

.first()

.select('NDVI')

.toInt16();

exportImage(image, roi, indexs[i]);

}

});