# Presentation: 129188

##  Goals and Initial GOFC Focus

     J Morisette, J Privette, & C Justice*
	NASA Goddard Space Flight Center
	*University of Maryland

	Established in late 2000

	as a subgroup of the 
	CEOS Working Group on 	Calibration/Validation

  Linked through www.wgcvceos.org

- Land Product Validation Subgroup

** ****Goals and Initial GOFC Focus**
**     ****J Morisette, J Privette, & C Justice***
**	****NASA Goddard Space Flight Center**
**	*****University of Maryland**
**	****Established in late 2000**
**	****as a subgroup of the **
**	****CEOS Working Group on ****	****Calibration/Validation**
**  ****Linked through www.wgcvceos.org**

## Outline

**Overview of Land Product Validation subgroup**
**Description of existing projects**
**Comments on GOFC/GOLD proposed activities**
**Opportunities for GOFC/GOLD/LPV coordination**

## CEOS Structure

**Calibration and Validation**

**Information Systems and Services**

**Applications and**
**Outreach**

**CEOS**

**Working**
**Groups**

**Sub-**
**Groups**

**Land Product Validation**

## Why we need to validate Global Land products

**Good science and resource management require understanding of product accuracy/uncertainty**
**Explicit statements of uncertainty fosters an informed user community and improved use of data**
**International environmental protocols and agreements imply findings will be independently evaluated and possibly challenged**
**As more, and similar, global products are produced by CEOS members, inter-use will require characterization of each product’s uncertainty**
**Validation needs to be an integral part of each mission, funded as with sensor and algorithm development**

## LPV: global validationgeneral operating principals 

**the ultimate objective is to characterize products’ uncertainty **
**utilize independent data with relatively high accuracy and global consistency**
**recognize limited resources for both data collection and analysis**
**capitalize on the concept that imagery and field data sets can often be used to validate more than one product**
**utilize local expertise through regional approach**

## Objectives of LPV

- to increase the *quality* and *economy* of global satellite product validation via *international coordination* on developing and promoting _standards and protocols_ for field sampling, scaling, error budgeting, data exchange and product evaluation
- to advocate mission-long validation programs for current and future earth observing satellites.

## LPV: Current Strategy

- Compliment the GOFC/GOLD agenda
- Conduct a series of topical meetings organized in association with community experts, aligned with GOFC’s implementation strategy:
- Biophysical Parameters (focus on LAI)
- ESRIN, Frascati, Rome, 7-8 June, 2001
- Fire Monitoring and Mapping
- Planning: Lisbon, Portugal, 9-11 July, 2001
- Pilot project: Thailand, with S.E. Asia network, Phuket, Jan 2002
- Land Cover Characteristics and Changes
- USGS Land cover meeting, North Carolina, US, Jan. 2002
- Here
- GLC2000, Ispra, March 2002
- BRDF/ALBEDO
- IWMMM-3 workshop, Colorado, June 13-14, 2002

## LPV, GOFC/GOLD relationship

**LPV, GOFC/GOLD ****relationship**

**Fire**

**Land****Cover**

**Bio-****physical**

**Others..**

**LPV**

**GOFC**

## Current activities

- “LAI intercomparison” ~30 sites from various CEOS member agencies and Universities
- Continue with joint CEOS/GOFC fire/burn scar validation sites focusing on establishing regional contacts and sites
- Using EOS Land Validation Core Sites as an example, establish the “CEOS Land Validation Core Sites” in conjunction with the CEOS Working Group on Information Systems and Services (WGISS)

## Current activityLAI inter-comparison

**Current activity****LAI inter-comparison**

**Multiple agencies working on producing and validating of LAI...**
**Multiple methods to collect LAI field measurements...**
**...****Imply the efficiency and usefulness of multiple agency validation inter-comparison**

**	****	****LI-COR LAI-2000**
**Hemispherical Photography**
**	****	****TRAC ****	****(Tracing Radiation and ****	****Architecture of Canopies)**

## Current activityLAI inter-comparison

- Pick list for each site
- All sites have MODIS subsets
- Some sites have ETM+
- Some sites have IKONOS
- Some site might have SPOT
**All site contacts have promised link to high-resolution LAI maps**

***critical component***

## Current activityFire/Burn scar validation

**     ****NASA/MODIS****	****	****	****JRC****	****	****	****ESA**

- Multiple agencies producing fire products
- Multiple agencies working on burn-scar products
- Multiple agencies considering fire emissions products
- No consistent protocol for validation of global products...
- ...coordinated effort with GOFC fire to develop, test, and document field protocols for fire product (burned area) validation

## Current LPV activity:CEOS Land ProductValidation Core Sites

- Potential joint project with CEOS Working Group on Information Systems and Services (WGISS) being led by the LPV
*(telecon with WGISS plenary,Wednesday a.m.)*
- Improve access (e.g. web-based) to land products from CEOS members – could include Land Cover products from multiple sensors agencies and promote “inter-comparison”

## Possible Data Compilation for CEOS Core Sites

**SATELLITE DATA and PRODUCTS**
**  ****from various CEOS Member**
**  ****sensors, subsetted over the site **
**  ****and WWW accessible.**
**  **

**Ancillary/GIS Layers**
**   ****such as...**
**   ****- elevation**
**   ****- reference layer (with political **
**    ****boundaries, airports, water bodies)**
**  **
**Scientific Networks**
**  ****such as AERONET**

**Field and airborne data**
**  ****WWW accessible, but maintained “locally”**
**  **

*Graphic courtesy of the BigFoot program*

**Possible Data Compilation for CEOS Core Sites**

## IKONOS, close up

**IKONOS, close up**

**MODIS 1200x1200km****2**** tile**
- yellow box indicates bounding
- box for ETM+ scene below

**ETM+ scene**
- yellow box indicates bounding
- box for IKONOS scene below

- Includes material © Space Imaging L.P.

## ETM+			IKONOS

- ETM+			IKONOS

## Current Distribution of Biophysical parameter sites

- EOS (NASA)

- VALERI (CNES)

- VALERI (EC?)

**Current Distribution of Biophysical parameter sites**

- (     both EOS and VALERI)

## EOS Core Sites infrastructure as examplehttp://modarch.gsfc.nasa.gov/MODIS/LAND/VAL

**EOS Core Site web page ****provides link to on-line ftp directories**

**EDC DAAC:**
**MODIS, ETM+, ****ASTER**
**SeaWiFS subsets**
**at GSFC**
**Ancillary data**
**at Umd**
**...**
**Field data **
**“****locally” maintained**

**ORNL Mercury system:**
**Archive and access of**
**field data**

## CEOS “Core Sites”, interaction between WGCV/WGISS & GOFC/GOLD

**WGISS:**
**provide seamless internet-based access to the multiple data sets**

**WGCV: **
**negotiate subsetting and on-line storage of core site data**
**GOFC/GOLD**
**site locations and data set requirements, **
**some correlative analysis on these data, and **
**interpretation of possible discrepancies between products**** **

**CEOS**
**Agencies’**
**Data &**
**Products**

## Summary of LPV overview

**LPV provides direct link for validation efforts through space agencies**
**LPV/GOFC validation is a joint activity**
**LPV – validation, GOFC – producers/user link**
**Land cover, how do we proceed?**
**LPV is in its initial stages and being defined by these topical meeting**
**The benefits of coordinated efforts (efficiency and uniformity) have been recognized – LPV has been established to provide support.**
**Timeline:****...review current/existing projects...****...consider a common protocol...****...product inter-comparison/cross validation... ****...quantitative correlative analysis**

## Comments on proposed GOFC/GOLD Land Cover strategy

**LPV, in general, helps “promote common data processing standards and interpretation methods” **
**CEOS core sites address “multiple sensors, in combination with in situ data, to produce validation information products which satisfy clearly identified requirements of use agencies and research groups”**

## Validation issues specific to Land Cover

**Land cover validation methods are *****arguably***** the most advanced (lessons from IGBP-DISCover) which implies that global validation of land cover is best poised to take advantage of GOFC/GOLD/LPV**
**Many opportunities to leverage off existing national/regional records & inventories, but questions about their *****access*****, *****timeliness*****, and *****relevance, *****LPV could serve as “clearinghouse”**
**“****% cover/continuous field” products lend themselves to multi-agency, multi-resolution comparisons, but requires validation methods different than error matrix**
**“****Cross-validation”, comparing multiple products over the same area, may be first step; which could feed into multi-sensors land cover algorithms.**

## Using LPV for continued coordination with GOFC/GOLD Land Cover (possibilities/suggestions)

**GENERAL:**
- Continued interaction on existing Global Land Cover validation activities, help coordinate validation of the various land cover activities
- Leverage financial support to help future international *quantitative* efforts
**SPECIFIC:**
- GOFC/GOLD providing comments on Core Site selection (done through regional networks, several sites per networks, help select data where and when it can do the most good for users and validation)
- Land Cover product inter-comparison, similar to LAI inter-comparison, at “CEOS Core Sites” – opportunities for multi-resolution and VNIR and SAR
- Feeding enhanced products from GOFC L.C. efforts into CEOS Core Sites  (such as ortho-corrected or atmospheric corrected imagery)
- Someone to attend upcoming GLC2000 on behalf of LPV (?)
- National forest inventories, clearing house of these “in situ” data set through GOFC/LPV
- Official liaison from GOFC-Land cover implementation team to serve on LPV – GOFC can provide useful information on “user needs” for validated products     *(appointed during this meeting?)*