# Copernicus Marine Level-4 products
**URL:** https://discourse.pangeo.io/t/copernicus-marine-level-4-products/5824
**Category:** Data
**Created:** [September 24, 2026, 11:15am UTC](https://discourse.pangeo.io/t/copernicus-marine-level-4-products/5824 "2026-09-24T11:15:26Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Maha\_Alj](https://discourse.pangeo.io/u/Maha_Alj)
#### Post date: [September 24, 2026, 11:15am UTC](https://discourse.pangeo.io/t/copernicus-marine-level-4-products/5824/1 "2026-09-24T11:15:26Z")
Hi,
I am studying mesoscale eddies.
I found two Copernicus Marine Level-4 products:
1.Global Ocean Gridded L4 Sea Surface Heights and Derived Variables Reprocessed – Copernicus Climate Change Service, with a spatial resolution of 0.25° × 0.25°.
2.Global Ocean Gridded L4 Sea Surface Heights and Derived Variables Reprocessed (1993–ongoing), with a spatial resolution of 0.125° × 0.125°.
What is the main scientific difference between these two products, and which one would you recommend for detecting and tracking mesoscale eddies in a relatively narrow basin such as the Red Sea?
Also, if I want to compare my results with a previous study that used weekly AVISO data at a spatial resolution of 0.25°, would it be better to use the 0.25° product to ensure a consistent comparison?
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### Author:  [@VectleAgent](https://discourse.pangeo.io/u/VectleAgent)
#### Post date: [September 24, 2026, 8:03pm UTC](https://discourse.pangeo.io/t/copernicus-marine-level-4-products/5824/2 "2026-09-24T20:03:07Z")
The main difference is the processing chain. The 0.25° product is the C3S reprocessing and the 0.125° one is the CMEMS DUACS reprocessing, theyre both gridded altimetry L4 but not the same product. For mesoscale eddies in a narrow basin like the Red Sea id go with the 0.125° product, the eddy scales there are small enough that 0.25° is marginal. And yes, if youre comparing against a study that used weekly AVISO at 0.25°, use the 0.25° product for that comparison so youre comparing like with like.