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Hi Chui, Unfortunately, there is no easy way to do that without downloading the original files. One method that I used may help a little. You can find all the MODIS L1 and L2 files that matches the date and time (+- time differences that you prefer). Then use wget to download all the files, and subt...

Hi, It sounds like you may be planning to average the daily mapped files to get 8-day and monthly mapped files. You should use l3 BIN data instead of SMI for that purpose. After binning, you can use the SeaDAS l3mapgen to produce the mapped images. All the standard mean/composite products are calcul...

The easy way to get Lw is using the l2gen of SeaDAS. Other parameters including brdf can also be obtained from l2gen.
Guoqing

Hi RG, Do you mind sharing a little detail about why you want to get Lw? If you meant to obtain the nLw (normalized water-leaving radiance, some products use it as standard L2 data), there is a simple equation: nLw = Rrs*F0, and you can find F0 here: https://oceancolor.gsfc.nasa.gov/docs/rsr/rsr_tab...