GEE批量下载代码_gee下载landsat_MODIS_LANDSAT_gee_

Map.addLayer(roi) //landsat8 and roi 我们这里使用的2016年全部的Landsat8影像， var l8collection = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR") .filterBounds(roi) .filterDate('2016-01-01', '2017-01-01'); print(l8collection); //GEE将NDVI计算公式封装为一个方法可以直接调用 var getNDVI = function(img){ return img.addBands(img.normalizedDifference(['B5','B4']).rename('NDVI')); }; var getNDVI2 = function(img){ return img.addBands(img.select('B5').subtract(img.select('B4')) .divide(img.select('B5').add(img.select('B4')))); }; var l8ndvi = l8collection.map(getNDVI); print(l8ndvi) var l8 = l8ndvi.select('NDVI'); print(l8) //NDVI显示配置，NDVI值范围是-1到1 var visParam = { min: 0, max: 1, palette: 'FFFFFF, CE7E45, DF923D, F1B555, FCD163, 99B718, 74A901, 66A000, 529400,' + '3E8601, 207401, 056201, 004C00, 023B01, 012E01, 011D01, 011301' }; //原始影像真彩色 Map.addLayer(l8, visParam, "ndvi"); //封装导出函数，将所关心区域的NDVI值导入云端 function exportImageCollection(imgCol) { var indexList = imgCol.reduceColumns(ee.Reducer.toList(), ["system:index"]) .get("list"); indexList.evaluate(function(indexs) { for (var i=0; i<indexs.length; i++) { var image = imgCol.filter(ee.Filter.eq("system:index", indexs[i])).first(); //image = image.toInt16(); Export.image.toDrive({ image: image.clip(roi), description: indexs[i], fileNamePrefix: indexs[i], folder: '2016_OB_buf_L8NDVI(2)', region: roi, scale: 30, crs: "EPSG:4326", maxPixels: 1e13 }); } }); } exportImageCollection(l8, visParam)