# Presentation: 060019

## MODIS Land C6

- Robert Wolfe
- NASA GSFC Code 614.5
- MODIS &VIIRS Science Team Meeting
- May 14, 2008

## C6 Straw-man Time-line

- May 2008	List of L1 C6 changes defined
- June 2008	List of Land C6 changes defined and a 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
- Sept to Dec 2009	Delivery of Land C6 algorithms
- Oct 2008 to June 2009   Science testing of Land C6 algorithms
- Jan 2009	Start C6 L1 production with current C5 Atmos and Land algorithms
- July 2009	Start of Land C6 reprocessing; @ 16.5X reprocessing would finish July 2010

## C6 Questions

*Questions to science team members to aid **in C6 reprocessing planning*
- What changes (if any) do you feel are important to make to your algorithm?
- What upstream algorithm changes would your algorithm benefit from?  Also, what upstream changes would necessitate a reprocessing for your algorithm?
- Based on 1 and 2, what are the significant scientific benefits from a C6 reprocessing for your algorithm?
- Are there any other changes, such as product format changes, that are also needed?  Why?
*Answers in “MODIS Land C6 Planning v6 rw.doc”*
*(my summary follows)*

## C6 Answer Highlights (1/6)

- Surface Reflectance (Vermote)
- Continuous aerosol QA flag
- Improvement to clouds and shadows (with LDOPE)
- BRDF coupling in aerosol retrieval and surface reflectance
- 8-day BRDF corrected reflectance (with gap fill)
- Vegetation Indices (Huete)*
- Improved temporal frequency and temporal gap filling
- Better snow/ice and inland-water handling
- Strengthen backup EVI2 algorithm and adjust VI (negative) range
- BRDF/Albedo (Schaaf)
- Improve backup algorithm
- Improve quality fields and move to L2G-lite
- Optional: 2 bands @ 250m and 4-day frequency (based on 16-days)

** Funding dependent*

## C6 Answer Highlights (2/6)

- LAI/FPAR (Ranga)*
- (none planned)
- Net Photosynthesis (Zhao/Running)
- Biome-Look-UP-Table (BPLUT)  update
- Finer spatial resolution GMAO data
- Vegetation Continuous Fields (Carroll/Townsend)
- Changes dependent on any Surf. Refl. changes and final C5 VCF product (will finish next summer)
- Burned Area (Roy/Justice)
- Include active Fire product
- Any improvements to Surf. Refl.

** Funding dependent*

## C6 Answer Highlights (3/6)

- Land Cover/Dynamics (Friedl)
- Land Cover
- Migrate to hieratical LCCS compliant classification scheme
- Stabilize classification across years
- Improve difficult classes
- Land Dynamics
- Move to 250m product (see NBAR)
- Use 8-day product
- Improved snow screening and gap filling
- Asymmetric sigmoid fitting
- Thermal Anomalies/Fire (Giglio/Csiszar)
- Refine internal cloud mask – heavy smoke
- Fix false alarms in Amazon
- Fix scan edge cloud/water confusion with Fire (obscure bug)

## C6 Answer Highlights (4/6)

- Snow/Sea-ice (Hall)
- Collaborate with BU to improve snow albedo
- Create a “cloud-free” product (gap filled)
- Improved use of cloud mask
- Land Surface Temperature (Wan)
- Remove cloud contaminated values from L2 (in addition to L3) product
- Update LUT for split-window algorithm (focus on arid and semi-arid regions)
- Improve land-cover based emissivities (focus on barren areas)

## C6 Answer Highlights (5/6)

- Generic changes (Sadashiva)
- Use one cloud mask (not both MOD09 and MOD35)
- Fix L2G-lite and use in downstream algorithms (not L2G(-heavy) or MODAGG)
- Eliminate 1km products when 500m is available
- L1B and Geolocation (Wenny/Xiong and Wolfe)
- See Tuesday material for details
- L1B
- Dead detector handling change (fill, not interpolated)
- A0/A2 update – Thermal bands
- RVS update (detector dependent)
- New polarization information (from Oceans; particularly for recent Terra)
- Geolocation
- improved terrain correction and 500m geolocation
- possibly incorporate new L/W mask and 500m terrain model

## C6 Answer Highlights (6/6)

- L2G, L2G-lite (Wolfe)
- Any fixes needed so L2G-lite can be used with down-stream algorithms (inc. any additional Surf. Refl. fields)
- Use 500m geolocation in 500m/250m products
- Alternate Atmospheric Correction (Lyapustin)
- New algorithm, produces: cloud mask, land/water/snow mask, AOT, QA flags and surface parameters
- Surface parameters (spectral) include: Li-Sparse Ross Think BRF model; NBRF (similar to NBAR); IBRF (instaneous BRF); albedo
- Over snow, also: sub-pixel snow fraction and grain size
- Gap-filled when new observations are not available (i.e. for clouds)
- Other upstream discipline changes (cloud mask, aerosols, etc.)
*[list of changes needed]*