I am trying to export all images of the image collection of VIIRS. I am following the answer from this post. Instead of setting a bounding box as a clipping layer I have a .shp of my study area. When I run the code I am receiving this error:

In users/fitoprincipe/geetools:batch
Line 133: collection.size is not a function

Here is the code:

 var batch = require('users/fitoprincipe/geetools:batch');
    // Load the VIIRS ImageCollection.
    var dataset = ee.ImageCollection('NOAA/VIIRS/DNB/MONTHLY_V1/VCMCFG')
    batch.Download.ImageCollection.toDrive(dataset, 'Folder',
    {scale: 460,
    region: (table),
    type: 'float'})

Why that error? I believe I am following exactly the steps like others did and when I download a single monthly image I do not have any issue.

  • You excluded the line of code actually generating the error, there is a problem with your use of .size() not the image exporting
    – M. Nicolas
    Sep 20, 2022 at 18:26
  • I didn't exclude it, it's the first code chunk (var batch =....)
    – Nikos
    Sep 20, 2022 at 18:38
  • Your error is marked line 133 within the script you are requiring, clearly there are not 133 lines here nor is there a size function so yes it is excluded.
    – M. Nicolas
    Sep 21, 2022 at 16:44
  • in the beginning of my script I am calling a function (var batch = require('users/fitoprincipe/geetools:batch')). This function can be found here (github.com/fitoprincipe/geetools-code-editor/wiki/…). Also, I mention in my post, what steps I am following (please refer to the link in my question). My code doesn't have 133 lines of code so the issue is probably with the function I am calling although other people seems to not having an issue with the function.
    – Nikos
    Sep 21, 2022 at 16:56

1 Answer 1


There is no problem with Principe's code. Here is the solution:

//var table = ee.FeatureCollection("users/nikostziokas/manchester");
var batch = require('users/fitoprincipe/geetools:batch')

// Load Landsat 8 imagery and filter it  
var collection = ee.ImageCollection('NOAA/VIIRS/DNB/MONTHLY_V1/VCMCFG')
  .filter(ee.Filter.date('2013-05-01', '2021-12-31'))
/* from here I was transforming the collection into an Image
  .clip(table); // clip is an ee.Image method
var count = collection.size()
print("Collection", count)

// export collection to google drive
  {name: 'ntl_{system:index}',
  crs: 'EPSG: 27700',
  type: 'float',
  scale: 460,
  region: table});

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