GEElandsat数据下载

此处是入口，本在线平台需要科学上网

用户界面

//此处导入自己的研究区

function maskL8sr(image) {

// The third bit is cloud and the fourth bit is cloudshadow。

var cloudShadowBitMask = 1 << 4;

var cloudsBitMask = 1 << 3;

// Get QA_PIXEL band.

var qa = image.select('QA_PIXEL');

// Set the cloud mask to zero

var mask = qa.bitwiseAnd(cloudShadowBitMask).eq(0)

.and(qa.bitwiseAnd(cloudsBitMask).eq(0));

// Update the cloudmask

return image.updateMask(mask)

.select("SR_B.*")

.copyProperties(image, ["system:time_start"]);

}

// Map the function over 3 months of data and take the median.

// Load Landsat-8 surface reflectance data.

var landsat8 = ee.ImageCollection("LANDSAT/LC08/C02/T1_L2")

.filterBounds(table2)

.filterDate('2020-04-29', '2020-04-30')

// Pre-filter to get less cloudy granules.

.filter(ee.Filter.lte('CLOUD_COVER',5))

.map(maskL8sr)

.median()

.clip(table2);

landsat8 = landsat8.uint16();

print(landsat8);// visualize the datasets

var rgbVis = {

min: 8400,

max: 15000,

gamma:1.5,

bands: ['SR_B4', 'SR_B3', 'SR_B2'],

};

Map.addLayer(landsat8,rgbVis,'landsat8');

var imgselect = landsat8.select('SR_B2','SR_B3','SR_B4','SR_B5');

//Export image to google drive and then download

Export.image.toDrive({

image:imgselect,

description:'s4',

scale:30,

region:table2,

folder:"result",

crs: "EPSG:4326",

maxPixels: 1e13

});