返回GEE中来自马赛克的图像列表？

问题描述

我想列出在GEE中用于镶嵌的图像列表。我知道镶嵌函数使用最后图像的像素（按时间顺序）。但是我非常需要这样做，所以我想减少一些时间。遵循代码示例：

（共享必要的输入）

var roi = ee.FeatureCollection('users/erlisantos/Poligono_buffer_BH_Riodoce').geometry();

var start = ee.Date("2018-01-01");
var finish = ee.Date("2018-02-02");

var sentinel1 = ee.ImageCollection('copERNICUS/S1_Grd_FLOAT')
                  .filter(ee.Filter.eq('instrumentMode','IW'))
                  .filter(ee.Filter.eq('orbitProperties_pass','DESCENDING'))
                  .filter(ee.Filter.eq('resolution_meters',10))
                  .filterBounds(roi)
                  .filterDate(start,finish);

print(sentinel1,"Selected images");
  
/** Mosaicking Sentinel-1 scenes by date */
// Difference in days between start and finish
var diff = finish.difference(start,'month');
//print(diff,"Difference of months");
  // Make a list of all dates
var range = ee.List.sequence(0,diff.subtract(1)).map(function(day){return start.advance(day,'month')});
print(range,"List of all months");
  // Funtion for iteraton over the range of dates
var day_mosaics = function(date,newlist) {
  // Cast
  date = ee.Date(date);
  newlist = ee.List(newlist);

// Filter collection between date and the next day
var filtered = sentinel1.filterDate(date,date.advance(1,'month'));

// get date as YEARMONTHDAY. For example,for January 8th 2010
// would be: 20100108
var date_formatted = ee.Number.parse(date.format('YYYYMMdd'));

// Make the mosaic
var image = ee.Image(filtered.mosaic()).set('Mosaic',date_formatted);

// Add the mosaic to a list only if the collection has images
return ee.List(ee.Algorithms.If(filtered.size(),newlist.add(image),newlist));
};

// Iterate over the range to make a new list,and then cast the list to an imagecollection
var newcols1 = ee.ImageCollection(ee.List(range.iterate(day_mosaics,ee.List([]))));
//print(newcols1,"Collection with Sentinel-1 mosaic images");

/** VISUALIZING ON THE MAP THE AOI AND SCEnes PROCESSED: */
Map.centerObject(roi);
Map.addLayer(sentinel1,{},"S1 collection");
Map.addLayer(newcols1,"S1 mosaic");

谢谢

解决方法

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