# Presentation: 640432

## Land Product Validation Jeffrey T. MorisetteNASA Goddard Space Flight Center Jaime Nickeson and Sebastien Garrigues.MODIS/VIIRS Science Team Meeting 15 May 2008

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## Current Validation Stage

- Stage 1
- Albedo/BRDF
- Fire
- LAI/FPAR
- Land cover
- LST
- Veg. Cont. Fields

- Stage 2
- Snow cover / sea ice
- Surface reflectance
- Veg. Index
- Stage 3
- NPP

**Notes:**
Concerted effort to update these as MODIS C5 reprocessing is completed.

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## MODIS/VIIRS overlap period

- Brown, M. E. et al., 2006. Inter-Sensor Validation of long-term NDVI time series from AVHRR, SPOT-Vegetation, SeaWIFS, MODIS, and LandSAT ETM+,  *IEEE TGARS*, 44(7)1787-1793.

- Bondville IL

## Example Inter-comparisons:Leaf Area Index

- GLOBCARBON

- MODIS

- CYCLOPES

- MODIS

- CYCLOPES

- ECOCLIMAP

- Garrigues, et al., (in press).Validation and Intercomparison of Global Leaf Area Index Products Derived From Remote Sensing Data, *JGR*.

**Notes:**
transition:
Some results obtained so far, focus on the metrics we used that can been used for other work, interpretation and analysis of these results have been recently started , so preliminary results.

Why intercompare?  know which product, or combination of products to use; useful for combined time series.

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## Considering the temporal component

- VI

- Current validation activities address the accuracy of a specific parameter at one or more points in time.

- Validation of phenological parameters requires quantifying the uncertainty in the time domain.

**Notes:**
Relates to VI and Land cover dynamics plans, can tie into US National Phenology Network.

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## Future: There is still a need to define land product accuracy requirements

- The land validation community could build on the experience  of the calibration community.

*Achieving Satellite Instrument Calibration for climate Change**May 16-18,  2006*

- Ohring, G., J. et al. (2007), Achieving Satellite Instrument Calibration for Climate Change, *Eos Trans. AGU, 88*(11), 136

**Notes:**
Possible topic for next Montana workshop?

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## Nickeson, J., J. Morisette, J. Privette, C. Justice, D. Wickland, 2007. Coordinating Earth Observing System Land Validation, EOS Transactions, 88(7)81-82. 

- Nickeson, J., J. Morisette, J. Privette, C. Justice, D. Wickland, 2007. Coordinating Earth Observing System Land Validation, *EOS Transactions*, 88(7)81-82.

## Maintain land product accuracy statements

- Product “pick-list”

## Accuracy statement for each product

## Support material for each accuracy statement

- - *updated by **product producer ****and**** the validation community.*

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

## Integration with IPO

- Participated in NOAA Asheville meeting (Feb. ‘08)
- Participate in NPP cal/val peer review (5/21/08)
- We could consider a NASA addendum to the NPP cal/val plan?

## Validation

- Validation science/results:
- Moving Land products to stage 2 or 3
- Validation/inter-comparison of MODIS/VIIRS
- Seasonality or temporal products
- Better define land product accuracy requirements
- Infrastructure:
- What we need to keep/enhance/change
- Complement IPO
- Contribute and exploit CEOS Working Group on Cal/Val

##   Data Quality,

**  ****Data Quality**,
-   **Data Policy** *and*
**  ****Communication & Education**.

**Notes:**
The Committee on Earth Observation Satellites (CEOS), the space arm of GEOSS, has established a quality assurance (QA) strategy to facilitate interoperability of GEO systems. 
This strategy is based upon a set of operational guidelines derived from “best practices” for implementation by the community; structured into an operational framework based on interoperability requirements.

## This QA4EO framework strategy, being completed and endorsed by CEOS for GEO task DA-06-02, will be recommended for integration and use throughout the GEO community.

- Work is underway to optimise an implementation strategy for endorsement at CEOS plenary in November 2008, and its potential evolution to meet any additional specific needs of data providers, for example those related to *in situ *measurements.

## Slide 22

## Terminology: the CEOS Validation Hierarchy

- Stage 1 Validation: Product accuracy has been estimated using a small number of independent measurements obtained from selected locations and time periods and ground-truth/field program efforts.
- Stage 2 Validation: Product accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts.
- Stage 3 Validation: Product accuracy has been assessed, and the uncertainties in the product well-established via independent measurements made in a systematic and statistically robust way that represents global conditions.

- Morisette, J.T., F. Baret, S. Liang, 2006. Special issue on Global Land Product Validation, *IEEE TGARS* 44(7) 1695-1697.