I'm very new to GEE and programming in general. I have this code that filters Landsat 5 imagery, creates a collection of NDVI layers, clips the NDVI layers, and creates mosaics of two NDVI layers of the same date. I would like to keep the original name of the image (for example, LANDSAT/LT05/C02/T1_L2/LT05_039037_20010106) but when the images pass through the iterate function they lose all of their properties.

Here is the first part of the code:

// filtrar imagenes landsat 5
var dataset = ee.ImageCollection('LANDSAT/LT05/C02/T1_L2').filterDate(start, finish).filter(ee.Filter.eq('WRS_PATH',39)).filter(ee.Filter.rangeContains('WRS_ROW', 37, 38));

var addNDVI = function(image) {
  var ndvi = image.normalizedDifference(['SR_B4', 'SR_B3']).rename('NDVI');
  return image.addBands(ndvi);
var ndvi = dataset.map(addNDVI);
var ndvi = ndvi.select(['NDVI']);

// Clip al area de estudio
var clipToCol = function(image){
  return image.clip(DR014);
var clip = ndvi.map(clipToCol);

This is the part of the code where the images lose all of their properties:

// mosaico NDVI por fecha
var diff = finish.difference(start, 'day');

var range = ee.List.sequence(0, diff.subtract(1)).map(function(day){
  return start.advance(day,'day')});

var day_mosaics = function(date, newlist) {
  date = ee.Date(date);
  newlist = ee.List(newlist);
  var filtered = clip.filterDate(date, date.advance(1,'day'));
  var image = ee.Image(filtered.mosaic()).set({date:date});
  return ee.List(ee.Algorithms.If(filtered.size(), newlist.add(image), newlist));
var mosaico = ee.ImageCollection(ee.List(range.iterate(day_mosaics, ee.List([]))));

1 Answer 1


First, you are losing all of your properties in your iterate function. What you want to do is tell it explicitly to keep the date property, like this:

var image = ee.Image(filtered.mosaic()).set({date:date});

Then, in the same loop where you are clipping your image collection, you can use that date to rename your images (well the image band):

var clipToCol = function(image){
  var date = ee.Date(image.get('date'))
  return image.clip(DR014).rename(date.format('YYYY-MM-dd'));

I chose that format arbitrarily, but you can choose other formats.

On a separate note, clipping image collections, especially large ones is generally discouraged. It wastes computation time and is not necessary. I suggest you read this Coding Best Practices guide for GEE.

  • Also, use .filterBounds(DR014) instead of filtering by 'WRS_PATH' and 'WRS_ROW', it'll save you the effort of finding the path and row IDs.
    – M. Nicolas
    Jun 28, 2022 at 22:13
  • Thank you very much. I did what you suggested and the bands were renamed, however, now I can't visualize them on the map and this error appears (x21): Layer 2: Tile error: Expected a homogeneous image collection, but an image with incompatible bands was encountered: First image type: 1 bands ([2001-01-06]). Current image type: 1 bands ([2001-01-22]). Image ID: 1 Some bands might require explicit casts. Here's the "corrected" code: code.earthengine.google.com/3cdc0acdbd660a8a17a7e09d31a1413e
    – Deus
    Jun 29, 2022 at 0:49

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