我想从Google Earth引擎导出合成的无云Sentinel-2图像,该图像可编译2017年至今的数据。我希望为每个乐队导出复合材料。
function maskS2clouds(image) {
var qa = image.select('QA60');
// Bits 10 and 11 are clouds and cirrus, respectively.
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);
}
// Filter to only include images intersecting Colorado or Utah.
var polygon = ee.Geometry.Polygon({
coords: [[[-135.3539859086835, 64.45205192005692],
[-135.3539859086835, 64.00063248338122],
[-134.008160713371, 64.00063248338122],
[-134.008160713371, 64.45205192005692]]],
geodesic: false
});
// Map the function over one year of data and take the median.
// Load Sentinel-2 TOA reflectance data.
var dataset = ee.ImageCollection('COPERNICUS/S2')
.filterDate('2018-01-01', '2019-07-17')
.filter(ee.Filter.calendarRange(6,9,'month'))
.filterBounds(polygon)
// Pre-filter to get less cloudy granules.
.filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE', 30))
.map(maskS2clouds);
var rgbVis = {
min: 0.0,
max: 0.3,
bands: ['B4', 'B3', 'B2'],
};