the following are two examples from my test at early June 2017. both show offset along the south shore of the peninsula/islands.
site 1 (Lake Superior)
Landsat-8 true color reference: OLCI level 1: site 2 (Lake Ontario)
Landsat-8 true color reference:
OLCI level 1: all file above in my google drive https://drive.google.com/file/d/19DFjvTTUOymzK5HBxg0QryhMeU9NceUZ/view?usp=share_link
here are the data products I used for the test:
OLCI products: (download from : https://scihub.copernicus.eu)
Landsat-8 products: (download from : https://earthexplorer.usgs.gov/)
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I will contact ESA then. I post here to see whether other users encounter the same geolocation offset issue, and whether it is caused by projection, software, tie-points, or other issues.