GEE下载Sentinel-2A数据

谁借莪１个温暖的怀抱￠ 2023-10-14 11:06 55阅读 0赞

Map.centerObject(table,7);
    //这里可调整加载时影像的显示大小
    Map.addLayer(table)
    function maskS2clouds(image) {
        
      var qa = image.select('QA60');
      var cloudBitMask = 1 << 10;
      var cirrusBitMask = 1 << 11;
      var mask = qa.bitwiseAnd(cloudBitMask).eq(0)
          .and(qa.bitwiseAnd(cirrusBitMask).eq(0));
     
      return image.updateMask(mask).divide(10000);
    }
    var dataset = ee.ImageCollection('COPERNICUS/S2_SR')
                      .filterBounds(table)
                      .filterDate('2022-07-05', '2022-07-07')
                      // Pre-filter to get less cloudy granules.
                      .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 10))
                      .map(maskS2clouds);
                      
    var rgbVis = {
        
      min: 0.0,
      max: 0.3,
      bands: ['B4', 'B3', 'B2'],
    };
     
     
    Map.addLayer(dataset.median(), rgbVis, 'RGB');                 
    var exportdataset =  ee.ImageCollection('COPERNICUS/S2_SR')
                      .filterBounds(table)
                      .filterDate('2022-07-05', '2022-07-07')
                      .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 10))
                      .map(maskS2clouds)
                      .select(['B4', 'B3', 'B2']);
    //镶嵌裁剪函数，减少之后的工作量
    var mosaic = exportdataset.mosaic().clip(table);
      
      Export.image.toDrive({
        
          image:mosaic,
          description:'2022',
          scale:10,
          maxPixels: 1e13,
          region:table,
          fileFormat: 'GeoTIFF',
          formatOptions: {
        
            cloudOptimized: true
          }
        });

运行代码时仅需将shp导入，然后修改你所需的时间和波段，点击运行即可，最后下载后的影像是已经过shp裁剪过的影像，无需后续再使用Arcmap等软件裁剪。  
![在这里插入图片描述][dbac0b2ea3314443a4462635e2ead47a.png]

[dbac0b2ea3314443a4462635e2ead47a.png]: https://img-blog.csdnimg.cn/dbac0b2ea3314443a4462635e2ead47a.png