Hi

Now, I'm using the Sentinel-3 SYN L2 AOD product. When I choose the time is 20210101-20200331 in CREODIAS Find, there are 634 products. 

However, when I choose the same time in Copernicus Open Access Hub, there are 1289 products. So, I want to know why this website has so
much less data than the official website.

Thanks for the reply!

Hello Hao,

Could you send me screenshot of your query in Finder?
I will reproduce it and come back to you with an answer.
Please take a look: https://creodias.eu/-/finder-exact-count

Hi

Sorry, because the size is limited, I can't send you the screenshot. The search criteria are : (the selected search time is 20200101-20211001)
https://finder.creodias.eu/resto/api/collections/Sentinel3/search.json?maxRecords=10&startDate=2020-01-01T00%3A00%3A00Z&completionDate=2021-10-01T23%3A59%3A59Z&platform=S3A&instrument=SYNERGY&processingLevel=LEVEL2&productType=SY_2_AOD___&sortParam=startDate&sortOrder=descending&status=all&dataset=ESA-DATASET

There are 4242 products in CREODIAS. But in Copernicus Open Access Hub, there are 8295 products.

Copernicus Access Hub is official source of earth observation data. CREODIAS as data and information access service platform is supplied from this data source. Our data repository is still supplemented by historical products type SY_AOD which you're looking for. Unfortunetly, this process is slow beacuse this data aren't accessable for our platform offhand, so we need to order each product and wait them to restore, there are also limits of ordering. That's the main difference in quantity of data. Please pay attention to fact, that all products from Sentinel-3 on our platform are online (full archive - https://creodias.eu/data-offer) and can be downloaded immediately. A big part of products from Copernicus Access Hub are in offline status, so if you want to download them, you need to first make order and wait for processing.

I get it.
Thanks for your reply!