How to differentiate between re-processed and new scene image in the SNS topic

[williamsia]

Hi,

A bit of context, we're building a processing pipeline that subscribes to the SNS topic (arn:aws:sns:us-west-2:608149789419:cirrus-v0-publish) and perform some processing on the new scene image when it matches with the polygons that are registered in our system.

I noticed that there are images with datetime from 2019, so my question aside from checking the datetime with the current time, is there any explicit way for me to filter old images (I am assuming the 2019 is re-processed images) and I just want to process on a new images.

Thanks