[![I am getting this error in my code,I want to analyse time series, Any suggestions how to deal with it?][1]][1][! [][1]][1]

[1]: here is the code link https://code.earthengine.google.com/f81d964229bff9f264c18e17cb0a98ff

here is the asset file https://code.earthengine.google.com/?asset=users/atupelye/Rungwa_dissolved

  • Can you share your asset?
    – Jobbo90
    Nov 7, 2019 at 13:31
  • thanks, I have shared the asset
    – atu
    Nov 8, 2019 at 3:12

1 Answer 1


Definetly one issue is that your system:time_start property is missing for the Landtrendr Algorithm. When you create a median annual composite it needs to be define, for example as the minimum value inside the annual collection:

// Map over the list of years to generate a composite for each year.
var yearCompList = yearList.map(function(year){
  var yearCol = col.filter(ee.Filter.calendarRange(year, year, 'year'));

   var yearComp = yearCol.reduce(myReducer);
  var imgList = yearCol.aggregate_array('constant');
  var systemStart = yearCol.reduceColumns(ee.Reducer.min(), ['system:time_start']).get('min');
  // Reduce (composite) the images for this year.
  var nBands = yearComp.bandNames().size();
 return yearComp.set({
    'year': year,
    'image_list': imgList,
    'n_bands': nBands,
    'system:time_start': systemStart

Can't be for sure though without the asset.

  • I have run it, but I am still getting another error, Tile error: Internal error has occured, I wonder if its linked to the previous error
    – atu
    Nov 8, 2019 at 3:45
  • Most likely a scaling error: developers.google.com/earth-engine/debugging
    – Jobbo90
    Nov 8, 2019 at 14:44

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