The Land products will be reprocessed several times. Reprocessing involves applying the latest available version of the science algorithm to the MODIS instrument data and using the best available calibration and geolocation information. A collection numbering scheme is used to differentiate between different reprocessing runs. The collection number is apparent in the Land product filename.

Collection 1 is the name given to the suite of Land products made approximately the first year after MODIS-TERRA launched, using MODIS data sensed from 2000 to early 2001.

Collection 3 is the name given to the reprocessed collection 1 Land products and the Land products produced using MODIS data sensed from November 2000 to December 2002. Collection 3 products were produced from MODIS data sensed from November 2000 to December 2002.

Collection 4 is the name given to the reprocessed collection 1 and 3 Land products, sensed from November 2000 to December 2002, and the Land products produced using more recent MODIS data. Collection 4 products are being produced from 2000 to present.

Collection 5 is the name given to the reprocessed collection 4 Land products, sensed from November 2000 to December 2006, and the Land products produced using more recent MODIS data. Collection 5 products are being produced from 2000 to present.

• Later collections (e.g., collection 5) should provide more reliable products than earlier collections (e.g., collection 4).

• Users are encouraged to order the collection 5 Land products rather than the older collection products.

• All Land AQUA products are currently collection 5.

• A Collection 6 is planned for summer 2011.