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Hi, not sure what you are trying to do, but here is the tech doc for the land/water mask: https://oceancolor.gsfc.nasa.gov/resources/docs/technical/odps_land_mask.pdf

Hope it helps.

There are many ways to get the data you need. We provide reflectance, but it's not difficult to get normalized water-leaving radiance from reflectance. You can do search and download: https://oceancolor.gsfc.nasa.gov/data/download_methods/ For monthly and/annual mean, you can also use level 3/4 brow...

Lachlan is correct. chl1 is the chlorophyll estimated using CI algorithm (the parameters are from Hu et al. 2019) which performs better for low values. Here it was used to find the upper limit for the blending of CI and OCx algorithm to make sure low values are estimated using CI algorithm.

Hi,
That is one of the magic pictures produced by one of our retired scientists.
Here is a thread that he answered questions similar to yours and more:
viewtopic.php?f=7&t=1237

Hope you find it helpful,
Guoqing

Hi Slava,

No. The l2flags are up to date. Can you please provide some details - What are the differences? Did you noticed the differences in an OLCI file? If so, which one?

Thanks,
Guoqing

Sorry for the delayed response. There is no flag information on level 3 data. As binned data from level 2, level 3 data only used l2flags for quality control purpose in the binning procedure. Here are some documents that you can refer to about the details: https://oceancolor.gsfc.nasa.gov/atbd/sst/f...

Hello, The pattern doesn't make sense to me, and this shouldn't be a problem with the products. But just in case, can you please provide more details about what you did? Did you use the whole dataset (all the available l3 Chlorophyll products) for each mission to calculate the ratio? Is the ratio ca...

Hi Nabila,

Yes, we provide both in situ and satellite Chlorophyll-a data. Please let me know which one you are looking for. The methods to access them are a little bit different.

Guoqing

Hello, The difference is a likely result. When you use the average of the whole region for the trend, the value is more likely to be consistent. But if you take a closer look at the region for a particular day, as what you do in the first figure, you'll see the data vary from coastal water to the se...

Hello,

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