Geometric quality failed

[reza5635]

Hi, I am facing some Sen2 images that have failed the geometric quality test( can be seen in product specification before downloading the product). I wonder what it means? At first, I thought it might be due to georeferencing problem but it seems it is not. I overlaid some accurate online WMS on it and they fit pretty well! I wonder anyone has any ideas about these products? I mean is it safe to use them?
Thanks in advance.

[ABraun]

do these answers help?

Sentinel 2A: Geometric accuracy off by nearly 50 m

@reimari Hello, The product you have flagged (from S2A Absolute orbit 6011 of the 16th of August, 2016) is identified as having a Geolocation Error in ‘Table 3-2: Anomalies not related to processing’ in the Data Quality Report. The issue arose as a consequence of a unnanounced Collision Avoidance Manœuvre. Geolocation in affected products (Orbits 6003 - 6011)is in the region of 45 - 120 metres. Cheers Jan S2 MPC Operations Manager.

Sentinel 2 Geometric Accuracy

The Sentinel-2 geometric calibration team is still actively working on the preparation of the geometric refinement. The prototype processor has demonstrated long ago the efficiency of the geometric refinement for Sentinel-2 images. However the transfer to operations has proved more difficult than anticipated. First, the verification of the Global Reference Image (4 TB of data and millions of files) has taken more time than anticipated. Second, we had to rework the processing algorithm to make it…

[reza5635]

Thank you ABraun. As far as I understood, There might be couple of meters error in location. My scene is S2A_MSIL1C_20160831T095032_N0204_R079_T35VMJ_20160831T095217.SAFE. It seems almost all images in August 2016 have the same problem, which is a bummer since I am interested just in August for my research. The link you sent for data quality report is not working, I wonder apart from product attributes if there is any other quality report inside downloaded product?

[ABraun]

The link you sent for data quality report is not working

here is the latest version: https://sentinel.esa.int/web/sentinel/user-guides/sentinel-2-msi/document-library/-/asset_publisher/Wk0TKajiISaR/content/sentinel-2-data-quality-report-issue-03-may-2016-?redirect=https%3A%2F%2Fsentinel.esa.int%2Fweb%2Fsentinel%2Fuser-guides%2Fsentinel-2-msi%2Fdocument-library%3Fp_p_id%3D101_INSTANCE_Wk0TKajiISaR%26p_p_lifecycle%3D0%26p_p_state%3Dnormal%26p_p_mode%3Dview%26p_p_col_id%3Dcolumn-1%26p_p_col_count%3D1

[Jan]

Hello Ziya @reza5635

Happy New Year.

Can you give me an idea of the products in question you have issues with? I presume the GEOMETRIC_QUALITY Report highlights the issue? It may well be that what you are seeing is the EPHEMERIS_QUALITY being flagged as out of range. Can you confirm, please?

Thanks in advance

Jan

S2 MPC/CC Operations Manager

[reza5635]

Hi Jan, sorry for the late answer and happy new year to you too. I just noticed your wonder. Yes I confirm that it was geometric quality reported as failed! To be honest, due to that issue I used 2017 images and skipped 2016 ones due to that issue. I could not take the risk.

Kind Regards
Ziya