# Presentation: 942237

## C6 MODIS Land Science Test Plan

***Sadashiva Devadiga***

**MODIS/VIIRS Science Team Meeting May 14-16, 2008**

## C6 strawman time-line

| May 2008                | List of L1 C6 changes defined |
| --- | --- |
| June 2008		 | List of Land C6 changes defined and straw-man C6 plan developed |
| June/July 2008	 | Period for community comment/review on proposals |
| July to Dec 2008	 | Science Tests of C5 Atmos and Land products with C6 L1 software (C6 L1 may not be available until Sept/Oct 2008) |
| Sept to Dec 2009	 | Delivery of Land C6 algorithms (start early with incremental updates – July/Aug 2009) |
| Oct 08 to May 09	 | Science testing of Land C6 algorithms (start in July/Aug with C5 L1 and then switch to C6 L1) |
| Jan 2009		 | Start C6 L1 production with current C5 Atmos and Land algorithms |
| June 2009		 | Start of Land C6 |

**C6 strawman time-line**

## Science Test: Scope, Types and Data

- Types of Test
- Global Tests
- Time series Tests
- Targeted Tests
- Test Phase
- First Phase: Terra only. *Combined products can be generated using the C6 Terra only (or using C6 Terra and C5 Aqua).*
- Second Phase: C6 Aqua only and C6 Terra/C6 Aqua combined products
- Input Data
- Use C5 product as baseline
- Use two 16-day periods of data for global tests – summer and winter
- Limited number of tiles for time series test
- Production at MODAPS
- Production rate ~ 2x – 4x
- Subsets for validation community (?)
- Test data distribution
- Available through LAADS to Science Teams
- Available to User community (?)

## Cloud Mask and L2G-lite

- Evaluation of MOD09 internal cloud mask
- Test1: Compare with cloud mask from MOD35 using C5
- Test2: Duplicate MOD09 internal cloud mask in the MOD35 cloud bit of MOD09 and run downstream.
- Update L2G-lite
- Update the C5 L2G-lite algorithm
- Run a 16-day global test using C5 data
- MODAGAGG/MODHDFSR (updated to read L2G-lite)
- MOD09A1 and BRDF/Albedo

## C6 Science Test Plan

- Pre- Collection 6 testing (June 01, 08 – July 15, 08)
- Evaluate MOD09 Cloud Mask, Fix and test L2G lite
- 1st Terra 32-day global test (July 16, 08 – Aug 31, 08)
- Use C5 L1, C6 L2/L2G and C5 L3
- 1st C6 L1B Land Test (Sept 01, 08 – Sept 30, 08)
- Use C6 L1, C6 L2
- 2nd Terra 32-day global test (Oct 01, 08 – Nov 15, 08)
- Use C6 L2/L2G/L3
- 1st Terra Time Series Test (Nov 16, 08 – Jan 31, 09)
- Use C6 L2/L2G/L3
- 3rd Terra 32-day global test (Feb 01, 09 – March 15, 09)
- Use L1 C6/Land C6
- Targeted Tests (global/time series)  (Mar 16, 09 – May 31, 09)
- Terra C6 Land
- Terra C6 processing starts in June 09
- Aqua 32-day global test (May – June 2009)
- Aqua C6 L2/L3 and C6 Terra/Aqua combined
- Aqua Time Series (July 2009)
- Aqua C6 reprocessing starts in Aug 2009.

## VIIRS Land Product Quality Evaluation and Testing

## VIIRS Land Product Quality Assessment

**Pre-Launch**
**Ensure that the VIIRS land product meet specifications**
**Suggest and evaluate update to VIIRS land algorithms using MODIS C5 data product as the standard or reference for comparison.**
**Identify and develop tools to support operational pre and post-launch VIIRS Land algorithm evaluation**
**Post-Launch**
**Long term Data Quality Monitoring**
**Validate using data product from other instrument**
**Validate using Aeronet data/Core site data**

## VIIRS Land Product Quality Assessment LDOPE’s Role

- LDOPE suggests the required science test in consultation with the Science Teams.
- LDOPE evaluates the test results, if necessary consults Science Teams for expert evaluation.
- LDOPE in consultation with the Science Team either suggests updates to the algorithm or approves the tested version of the algorithm based on the evaluation of the test results.
- LDOPE will maintain set of websites similar to those used in MODIS for communicating the results of the QA
- Pre-launch testing is conducted by running the VIIRS algorithms on MODIS proxy data (MODIS instrument data mapped to the VIIRS bands with MODIS viewing geometry and VIIRS viewing geometry)
- Test results are evaluated
- Compared to C5 MODIS products
- Compare Land PEATE generated DDRs to the C5 MODIS tiled products

## Land PEATE: Land Quality Assessment http://landweb.nascom.nasa.gov/NPP

**Land PEATE: Land Quality Assessment** **http://landweb.nascom.nasa.gov/NPP**

## Science Test Description and Status

## VIIRS Pre-Launch Land Algorithm Testing and Evaluation

- Build 1.5 completion – Summer/Fall 2008
- Launch ready system – March 2009
- Test data: 16-day MODIS proxy almost ready – 2003193 Aqua mapped to VIIRS bands with VIIRS geometry
- Global Test
- Evaluate using DDRs
- Time Series Test
- Using limited number of tiles