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On?-0E( %  0bWorksheet Excel.Sheet.802Microsoft Excel Worksheet/ 0LDTimes New Roman(b(bPb 0tbtb 0  @n?" dd@  @@`` 0V     ,"$j3poN43Ҟc $@Ug4<d<db 0xb 8ppp@  <4BdBd(b(b <4!d!d(b(b:2___PPT9/ 0? %Y? MPath Forward for the Proposed WGCV Subgroup on Land Product Validation (LPV)RJeffrey L. Privette, NASA s GSFC Co-Chair ! LPV Vision rUsers of operational satellite products need to understand the products accuracy Product accuracy is determined through validation (independent measurements) Land product validation (Levels 3, 4) is in its infancy expectations not formed shared experience is advantageous excellence sets precedent Best science will result if all missions support validation and validation is on-going uncertainty information determined through standard practic algorithms are iteratively improved based on validation results a global validation strategy for global change issues GOFC has been chosen as an initial programmatic focus for LPV activities  emphasis on moderate resolution, level 2 and 3 products. *ZTZZZZ= +      #      ("*Global Observation of Forest Cover (GOFC)+*Part of the Global Terrestrial Observing System (GTOS)  contributing to the IGOS Carbon Theme Objective: to improve operational monitoring of land surface  now includes all surface types, but with an emphasis on forests from the carbon perspective GOFC themes Land cover Biophysical Parameters (LAI/FPAR/NPP) Fire Providing validated products is a high priority for GOFC Active collaboration with WGCV and WGISS is highly desirable Web Site: http://www.gofc.org/ ~Z6ZZR DY 5&!"LPV Neighborhood for GOFC Activity##Foundational IssuesConsistency in definition of products identify  common denominator measurements needed to reliably estimate accuracies of slightly different products from different missions international cooperation for rapid methods and data exchange/analysis Defining accuracy requirements seek input from user communities (e.g. global change modelers) accuracy targets will help define most efficient methods validation in a user (science) context Information and Data Sharing exchange promote data sharing and provide open-release guidelines combine central archives, distributed/linked sites (WGISS leadership) standard level of data reduction&&& !+`&!    5    .  .Validation  Test SitestProvide a focus for in-situ and satellite data collection in support of validation Quantity Required varies with: algorithm, product type, end-user, and within-class variability of a landcover Representative distribution Temporal distribution and  invariance solar angles, phenological changes, etc. dictate sampling frequency Size a function of sensor pixel, pointing accuracy, PSF, statistical significance of a set of pixels at one site)f\CDmT PC 8m  , $ EExamples of Emerging International Validation Networks and ActivitiesFENetworks Canadian LAI network (11 sites) European VALERI (6 sites) EOS Land Validation Core Site Network (23 sites) Miscellaneous mission-specific networks (e.g. ASTER) LPSIM Site Inventory (comprehensive list) WGCV test site dossier (65+) http://spsosun.gsfc.nasa.gov/calval/query.html Possibility of enhancing dossier to include LPV sites Activities NASA s Prototype Validation Exercise (PROVE) DISCover Global Land Cover Validation CSIRO ASTER Validation (Prata/Hook) ZZfZ ZwZ He  w<.p60!Validation Measurement Issues$,Experiment design and local scaling issues inconsistency in  point measurement design destructive sampling vs. indirect instruments community requests for handbook of  best practices e.g., BigFoot manual protocols of how measurements are taken, documented, sequence of activities, use of  black box software from instrument vendors Field Instruments recommendations estimating products from surrogate parameters characterization (specifications) calibration+l+Y  >-'Issues in Understanding & Using Results('$ 0Comparing a product with independent data Mismatch in spatial scale of sample vs. product Aggregation and scaling methods are fairly unsophisticated Evaluating multidate, composited or aggregated products with instantaneous ground samples Constructing error budgets and reporting statistics in a way that meets user community needs Estimating uncertainties globally from sample sites Within LC class variability Extrapolation method/usefulness is application-dependent Independence of  calibration sites (tuning) from validation sites+kZ]4UC+0Z3*38C,  c4Activities 1. Fast Track LAI Product Intercomparison55$Joint activity with GOFC biophysical team Product comparison and accuracy assessment using ground measurement data set Comparison of operational and research LAI products at  non-calibration sites Initial emphasis on coarse-resolution sensors Leverage Year 2000 field campaigns Leverage existing software/WWW resources Shake-out for more rigorous, longer-term and multiproduct comparisonsbZ)."(Go  ,Sites Providing Data for LAI Intercomparison *#%Activity 2. Fire Products Validation Joint activity with GOFC Fire Team Builds on Expresso, SAFARI, SCAR campaigns Characterization and intercomparison of Active Fire products DMSP, AVHRR, ATSR, MODIS, GOES Comparison with ground based fire data bases World Fire Web Validation Development of a network of representative long term Fire Validation sites Field protocols for data collection for Burned Area validation using high resolution data ATSR, MODIS, AVHRR GOFC Miombo Network pathfinding activity ZMZZ<ZZ#T  M (<P-/>  +$)Activity 3. Land Cover Product ValidationFocus on global land cover classification, continuous fields and land cover change products AVHRR,Vegetation, MODIS, ATSR, GLI, NPP Builds on Discover Validation approach and activity Use of high resolution data for validating global products Landsat/SPOT IKONOS Under development\Z)ZoZZZ\RRecommendationszFormalizing CEOS Core Sites building on existing pilot projects (e.g., EOS Cores Sites,VALERI, Canada LAI Net) Open sharing of validation data, develop collaboration within WGISS Test Environment Encourage limited set of openly-released imagery over Core Sites for validation purposes each year Sponsorship of community forums and workshops on product validation (incl. support of standard conferences) Develop WWW sites for ground instrument characterization, calibration, traceability, and  best practice use CEOS-sponsored (or endorsed) field instrument loan program ^>Z TO':,lk W"LPV Subgroup OrganizationCo-chairs: Stephan Dech (Kurt Guenther) (DLR) and Jeff Privette (NASA) Chairmanship tenure: 3-5 years Implementation: Annual, topical workshops with designated workshop leaders: Reports, recommendations. Community activities design to address issues/problems in validation zGGa#Topical Validation Workshops Planned Workshops 2001 GOFC: Fire Validation : July/August 2001 (Justice/Gregoire) GOFC: LAI/FPAR Intercomparison Preliminary Results Meeting 2001 (Privette/Baret/Leroy) Proposed Workshop (TBD) GOFC Land cover and change products validation (Skole/Gunawan) Suggested Future Topics for Land Product Validation Workshops GOFC: Biomass estimation accuracy (incl. VCL, SAR) Albedo / BRDF (combined with annual BRDF meeting) Snow cover/available water Land surface temperature Geostationary product validation in 2002 (MSG, GOES, Triana, etc.) @?9T<?    I"Re ` ( /'  ` ̙33` ` ff3333f` 333MMM` f` f` 3>?" dd@(|?" dd@  " @ ` n?" dd@   @@``PR    @ ` ` p>> :2(    6&   T Click to edit Master title style! !  0t&   RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  0& ``  =*  0& `   6J.L. 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