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//选择Landsat8 SR数据集
var l8 = ee.ImageCollection(“LANDSAT/LC08/C01/T1_SR”) Map.centerObject(roi, 8);
//Landsat8 SR数据去云 function rmL8Cloud(image) { var cloudShadowBitMask = (1 << 3); var cloudsBitMask = (1 << 5); var qa = image.select(‘pixel_qa’); var mask = qa.bitwiseAnd(cloudShadowBitMask).eq(0) .and(qa.bitwiseAnd(cloudsBitMask).eq(0)); return image.updateMask(mask); } //提取关心区域的波段数据
var l8Imgs = l8.filterBounds(roi) .filterDate(“2016-1-1”, “2017-1-1”) .map(rmL8Cloud); print(“l8Imgs”, l8Imgs); Map.addLayer(l8Imgs, {min:0, max:3000, bands:[“B4″,”B3″,”B2”]}, “l8Imgs”); Map
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