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Status of MODIS Production (C4/C5 Testing)

Updates on MODIS production, forward processing, science testing, and plans for Collection 5 reprocessing. Includes information on delays, downtime, new PGEs, and schedule dates.

stephaniehuffman
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Status of MODIS Production (C4/C5 Testing)

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  1. Status of MODIS Production (C4/C5 Testing) Mike Teague 1/5/06

  2. Collection 4 Forward Processing (1 of 2) • Over the last 3 months Terra and Aqua have averaged 1.1 and 1.2 days respectively behind real time; the largest lag was 2 days for Terra and 3 days for Aqua • All MODAPS production is performed from L0 input • The pacing item for Terra and Aqua production is the delivery of the NCEP/GDAS ancillary file which is delivered 24h behind real time. This is used as input to LSR (PGE11) • For Terra, some recipes that are not dependent on LSR can be processed closer to real time (e.g. LST and L2G Sea Ice). This can not be done for Aqua that uses a 24h ephemeris file compared to the 2h Terra format • The typical reasons for delays in MODAPS production are problems with the delivery of L0, ancillary, and ephemeris/attitude data to the GES DAAC. The incidence of these problems and the time required to correct them has reduced significantly in the last year • The forward processing machine has a production capacity of approximately 2.7x and additional linux processors can be moved on to the machine in the event of a serious production delay

  3. Collection 4 Forward Processing (2 of 2) • The average downtime on the forward processing machine has been 2.9% over the last 6 months • In the last year there has been only one instance of a production disk crash that resulted in minimal data loss • In the last 6 months 9 Terra and 4 Aqua PGE02 LUTs were loaded into operations • Two Collection 5 land PGEs are presently running in forward processing and the products are shipped to the SCFs only: PGE72 (16-day VCC) and PGE88 (Monthly Snow CMG) • In May 2005 following the TOVS failure, the ozone_daily ancillary product used by LSR (PGE11) became unavailable and LSR converted to using the NCEP/GDAS product

  4. Collection 5 Science Testing (1 of 3) • Collection 5 Science Testing started in July 2004 and 35 tests have been conducted to date • 172 Terra and Aqua updates to the land PGEs have been processed for Collection 5 science testing; 35 of these included metadata changes only. • 3 new monthly PGEs have been added for Collection 5: VI CMG, snow CMG, and burn scar • 9 (of 48) land PGEs have not yet been run in the tests but will be included in future testing. These are PGEs 32, 31, 24, 65, 82, 40, 58, 59, and 88. A further 4 will not be able to be tested because of the test duration. These are 41, 42, 66, and 87 • 33 of the tests were for Terra • Approximately half the tests were major tests involving 16+ test days (a 16-day global test generates 13TB of data products). Most of the remaining tests were rapid-response ad hoc tests in direct support of a specific developer • The most recent 33-tile time-series test for 2003 required 45 days to complete and generated 15TB of compressed data products • 4 more Terra and 5 more Aqua tests are planned before Collection 5 reprocessing starts; the Aqua tests are not critical path • For the most recent tests, the Land Archive and Distribution System (LADS) has been used to distribute test products to the developers

  5. Collection 5 Science Testing (2 of 3) • 4 more Terra and 1 Aqua science tests are planned before the start of the Collection 5 Terra reprocessing: • A 16-day global Terra test. The interval dataday 193-208, 2003 is being considered • A 48-day Aqua test for LST only. Late-April to early-June 2003 is planned • A Terra 3-month time-series test for 6 tiles. February through April 2003 is planned • A second Terra 3-month time-series test for 6 tiles. July through September 2003 is planned. The tiles will be different than those used in the prior test • A final Terra PGE patch test • The key schedule dates are: • NLT 1/18: Delivery of any PGE updates to be tested in the first 4 of these tests. Also included is the delivery of as many of the 9 untested PGEs as possible • NLT 2/21: Delivery of any updates from the 4 tests for inclusion in the final patch test. Also included is the delivery of all updates to include internal compression (42 PGEs) and and use of toolkit version 5.2.9 (30 PGEs) as well as any remaining of the 9 untested PGEs. SDST will convert many of the IRIX-only PGEs for linux processing

  6. Collection 5 Science Testing (3 of 3)

  7. Plans for Collection 5 Reprocessing (1 of 2) • Terra reprocessing is planned for a mid-March, 2006 start date • The reprocessing will proceed on a single machine at approximately 3.6x • The Terra-only interval will be completed by early-November 2006 • The Terra/Aqua period will be processed using two machines both of which will process Terra and Aqua in order to expedite the generation of combined products • The odd years will be processed on one machine and the even years on the second machine; the total production rate will be 7.2x • The Collection 5 reprocessing will be completed by December 2007 • Hardware upgrades are being considered to enable a faster reprocessing • The forward processing chain will be updated to Collection 5 when both the Aqua and Terra codes are available; this is estimated to be August 2006

  8. Plans for Collection 5 Reprocessing (2 of 2) • Data Archival • Products from the Collection 5 reprocessing will be archived and distributed through the Land and Atmospheres Archive and Distribution System (LAADS) • Because of disk storage limitations, only the following products will be archived in LAADS: LST, browse, CMGs, MOD15A1 and all 8+ day products • L1B, geolocation, and all remaining L2 and daily products will be temporarily available through a rolling 120-dataday (25-35 production days) data pool. Thereafter, these products will be available on a Processing-On-Demand basis through LAADS • Once approval is received from the land ST, reprocessed products will be exported to the LP and NSIDC DAACs • The archive strategy may be modified to include the more frequently requested L2 and daily products in the permanent LAADS archive

  9. Summary • Forward Processing • Most of the time this is as close to real time as possible; the occasional lags are corrected in 1-2 days • Science Testing • A significant part of the Terra Collection 5 testing has been completed • 5 tests remain to be run in the next 2 months • Production and Archival • The Terra and Aqua Collection 5 reprocessing will be a 20 month proposition • Data products will be archived and distributed through LAADS; some products will be available on a Processing-On-Demand basis only

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