Land Archive
Last Update: November 14, 2007
Collection 4
At the present time MODAPS land forward processing is being conducted using
Collection 4 codes. This will continue until the Collection 5 codes are
introduced in mid-December. All land products from this processing are
being and will be exported to the LP or NSIDC DAACs.
The GES DAAC stopped the production of Collection 4 L1 data products on
dataday 55 (February 24, 2006). The GES DAAC will continue to distribute
Collection 4 L1B, geolocation, and cloud mask for intervals earlier than
dataday 55 until early-September when the distribution of all Collection 4
data products will be terminated. The distribution of L1B, geolocation, and
cloud mask products after dataday 55 became the responsibility of
MODAPS after February 24, 2006. The distribution of these products for all
of the Collection 4 interval will become MODAPS responsibility after
early-September, 2006
(Transition Issues).
MODAPS will archive Collection 4 cloud mask/profiles in LAADS. However,
MODAPS will not archive either Collection 4 L1B or geolocation products in
LAADS. MODAPS maintains a "rolling" data pool for Collection 4 forward
processing L1B and geolocation. This data pool has a capacity of 21
datadays (compressed using hrepack) of Aqua and 21 datadays of Terra
products
(Data Access).
Collection 5
MODAPS will export Collection 5 land data products to the LP/NSIDC DAACs for
both reprocessing and forward processing. The data products, including data
volumes, archived at these locations are shown in the
Land Archive Table (updated
11/14/07)
(MSExcel spreadsheet).
The atmosphere Science Team has requested the inclusion of certain
Collection 5 land data products in the LAADS archive. Albedo products
(MCD43Ax, MCD43Bx, and MCD43C1C) will be archived. The reprocessing
of Terra products started on June 30, 2006
(Collection 5 Land Reprocessing Plan).
The cloud mask and geolocation products will also be archived in LAADS and
the L1B products will be archived in "rolling" data pools, with the
exception of the CONUS and European regions (and later Asia) which will be
permanently archived in LAADS.
As described in the
Collection 5 Land Reprocessing Plan,
the first stage of the reprocessing will utilize a single processing machine
for the Terra-only interval. The second stage will utilize two machines for
the Aqua/Terra interval. The second stage processing will therefore include
two data pools. This will be transparent to users accessing the data
products through LAADS.
The capacity of each data pool will be approximately 120 datadays of L1B
(compressed using hrepack). This is equivalent to approximately 30 calendar
days of reprocessing and forward processing production. User access to the
data pool will be provided through the LAADS. Any user requests for
Collection 5 data pool products older than the most recent 30 days of
production should also be submitted through LAADS. This will be satisfied
on a processing-on-demand basis
(LAADS Capabilities).
Details of the land reprocessing plan can be found at
Collection 5 Land Reprocessing Plan.
Data access instructions are given under
Data Access.
The LAADS Web
Data Availability
page provides a detailed identification of the Collection 5 data products
available through LAADS.
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