Google earth engine 下载哨兵二号数据

文章目录

• ​​上传ROI​​
• ​​加载ROI​​
• ​​运行任务​​
• ​​导入到谷歌云盘​​

上传ROI

加载ROI

var district = ee.FeatureCollection("users/hammesbridgettenubb74/helan");

var dsize = district.size();
var district_geometry = district.geometry();
print(dsize);
Map.centerObject(district_geometry,7);

//去云
function maskS2clouds(image) {
  var qa = image.select('QA60');
  
  // Bits 10和11分别是云和卷云
  var cloudBitMask = 1 << 10;
  var cirrusBitMask = 1 << 11;

  // Both flags should be set to zero, indicating clear conditions.
  var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
      .and(qa.bitwiseAnd(cirrusBitMask).eq(0));

  return image.updateMask(mask).divide(10000);
}

//处理数据，生成数据集
var dataset = ee.ImageCollection('COPERNICUS/S2')
                  .filterBounds(district_geometry)
                  .filterDate('2020-04-01', '2020-7-30')
                  // 选择云量
                  .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 1))
                  .map(maskS2clouds)
                  .select(['B2', 'B3', 'B4']);
                  
//可视化参数，按843波段合成                
var rgbVis = {
  min: 0.0,
  max: 0.3,
  bands: ['B2', 'B3', 'B4'],
};

//按中值合成指定指定时间段的影像
Map.addLayer(dataset.median(), rgbVis, 'RGB');

//设置显示样式：color代表边界颜色；fillcolor代表填充颜色
var styling={color:'red',fillColor:'00000000'}

//FH就是矢量边界
Map.addLayer(district.style(styling),{},"FH");

var IMAGE = dataset.mosaic();

//下载数据
Export.image.toDrive({
      image:IMAGE,
      description:'image',
      scale:10,
      maxPixels: 1e13,
      region:district_geometry,
      fileFormat: 'GeoTIFF',
      formatOptions: {
        cloudOptimized: true
      }
  });

运行任务

导入到谷歌云盘