I am unable to obtain this property of image:

PRODUCT_QUALITY STRING - (Indicator) that specifies whether the product quality is degraded or not. Allowed values are "Degraded" and "Nominal".


  • Are you trying to get PRODUCT_QUALITY from the image Dongguan_area? In that case, after using mean() at the beginning of the code, you lost the properties, because you are converting the collection into a single image (a mean composite). This composite does not have properties unless you set them.
    – HMSP
    Jun 18, 2021 at 11:02
  • how can i then obtain image properties for each date from 1 oct to 24 oct ?
    – No Name
    Jun 18, 2021 at 14:44

1 Answer 1


As I said before, you need the collection before applying mean. Then, you can convert it into a table, selecting the PRODUCT_QUALITY metadata. Now, you can check this metadata either by printing it or by exporting it into csv.

//filtering image collection without calculating the mean value
var dongguan_area = ee.ImageCollection("COPERNICUS/S5P/OFFL/L3_NO2")  //importing image collection dataset
  .filterBounds(area_dongguan)      //filtering region of interest
  .filterDate('2019-10-01','2019-10-24')     //filtering date 
  .select('NO2_column_number_density')  //selecting band
  //.mean();   //obtaining mean a/c to filters

// convert image collection into a table
var pq = ee.FeatureCollection(dongguan_area).select(['PRODUCT_QUALITY']);

// print table
print('PRODUCT QUALITY', pq);

// Export to csv
  collection: pq,
  description: 'pq',
  fileFormat: 'csv'

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