CCI ocean colour merged chlor_a

[mdsumner]

https://rsg.pml.ac.uk/thredds/catalog/cci/v6.0-release/geographic/daily/chlor_a/catalog.html

Suggest we get these, they are L3mapped daily composites of merged sensor (MERIS, MODIS Aqua, SeaWiFS LAC & GAC, VIIRS, OLCI). Good coverage for daily!

Example file (the httpServer link is good for download and remote connect)

https://rsg.pml.ac.uk/thredds/catalog/cci/v6.0-release/geographic/daily/chlor_a/2022/catalog.html?dataset=CCI_ALL-v6.0-Geographic/daily/chlor_a/2022/ESACCI-OC-L3S-CHLOR_A-MERGED-1D_DAILY_4km_GEO_PML_OCx-20220101-fv6.0.nc

The files range daily from 1997-09-04 to 2022-06-30, i.e. 9066 and each is 91Mb (so 806Gb in total).

Here's the direct links for the first and last currently available

https://rsg.pml.ac.uk/thredds/fileServer/cci/v6.0-release/geographic/daily/chlor_a/1997/ESACCI-OC-L3S-CHLOR_A-MERGED-1D_DAILY_4km_GEO_PML_OCx-19970904-fv6.0.nc
https://rsg.pml.ac.uk/thredds/fileServer/cci/v6.0-release/geographic/daily/chlor_a/2022/ESACCI-OC-L3S-CHLOR_A-MERGED-1D_DAILY_4km_GEO_PML_OCx-20220630-fv6.0.nc

2021-01-01 total number of observations:

[mdsumner]

here is calculated monthly mean (Jan 2021) from those dailies (thanks to the warper and some cunning GDAL dsn trickery) at 4km

vs. MODIS monthly mean at 8km