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Ocean Colour CCI

The Ocean Colour CCI (OC_CCI) project focuses on the Ocean Colour ECV encompassing water-leaving radiance in the visible domain, derived chlorophyll and inherent optical properties and will utilise data archives of from ESA’s MERIS and NASA’s SeaWiFS, MODIS and possibly CZCS (after careful evaluation) sensors archives. It is also looking at the feasibility of using OCM-2 and VIIRS data as a "gap filler" before the launch of Sentinel-3.

Extracting and downloading data

Access to several options, including FTP and the Composite Browser, is available via http://www.oceancolour.org/

If you’re interested in downloading a subset of the dataset then THREDDS provides several options. As an example, the NetCDF subset service allows for a spatial and / or temporal subset to be extracted.

From https://rsg.pml.ac.uk/thredds/catalog-cci.html first choose the temporal composites required (daily, 8day or monthly) and then access Option 5, which is NetcdfSubset. Now choose the products, Latitude / Longitude subset and time subset options. Then press Submit at the bottom of the page.

If you receive an error message then it’s likely you’re trying to download too much data in one block – files cannot be larger than 4GB. The Stride parameter can be set to a value greater than 1 if you only want every nth value.

The output is a single NetCDF file and so this method will become unwieldy for large areas / time periods.If you’d prefer binary or ASCII data then choose Option 1, which is OPeNDAP.

To browse the data in an interactive viewer then the Web GIS Portal (http://www.oceancolour.org/portal/) is an option that can produce plots / graphics of the data as well as also exporting layers. First select the product(s) that you’re interested in, then select ‘Analysis’ that should be in the top right hand corner and choose what you’d like to do.

3rd Newsletter from ESA’s Ocean Colour CCI Project

Newsletter-3-may14

The 3rd newsletter from ESA’s Ocean Colour CCI project can be downloaded from http://www.esa-oceancolour-cci.org/?q=webfm_send/397
 
The newsletter focuses on the outcomes Phase 1 of the project that include version 1 of the mergedtime-series product (now with monthly as well as daily composites online at http://www.oceancolour.org/), reports describing the products and their usage in climate research and linked peer-reviewed publications. 
 
The aim is to release a newsletter approximately every 6 months, but if you need any support in the meantime then please feel free to email help@esa-oceancolourcci.org

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