What are the ways can I retrieve the satellite data?

There are a few ways of retrieving data from OBPG. You can use the browseable
web interfaces or you can use FTP.

If you would like to use the the web interfaces there are links on the main page
http://oceancolor.gsfc.nasa.gov/ to the level 1/2, and 3 browsers.

If you would like to retrieve your data via the File Transfer Protocol (FTP)
please refer to the link http://oceancolor.gsfc.nasa.gov/ftp.html. This page has
all of the links that will provide you with direct ftp access to data products
organized by satellite.