Скачать презентацию Data Support for Validation of EOS Land Products Скачать презентацию Data Support for Validation of EOS Land Products

34b3ade400af9b21d1b25c27343b4fbd.ppt

  • Количество слайдов: 41

Data Support for Validation of EOS Land Products Larry Voorhees, Dick Olson, Bob Cook, Data Support for Validation of EOS Land Products Larry Voorhees, Dick Olson, Bob Cook, ORNL* DAAC Jeff Morisette, NASA GSFC John Dwyer, EDC DAAC Terra Data Products Review NASA HQ January 7 -8, 2002 * Oak Ridge National Laboratory is managed by UT-Battelle, LLC, - ORNL DAAC | Terra Data Products Review, Janfor the U. S. Dept. of Energy under contract DE-AC 05 -00 OR 22725. 7 -8, 2002

Contributors and Participants • Jeff Privette, Jeff Morisette, Nazmi El Saleous, and Robert Wolfe, Contributors and Participants • Jeff Privette, Jeff Morisette, Nazmi El Saleous, and Robert Wolfe, NASA GSFC • • John Dwyer, EDC DAAC Steve Running, U Montana Ranga Myneni, Boston U Alfredo Huete, U Arizona Dennis Baldocchi, UCLA Tom Boden, Ameri. Flux ORNL Many other Science Team and EOS Validation Investigators - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Summary • Approach for supporting validation has been • • • designed, reviewed, and Summary • Approach for supporting validation has been • • • designed, reviewed, and tested Distribution systems in place and working Data for validation are available and more data are being added MODIS Science Team, EOS Validation PIs, and others are using the systems Plans are in place to communicate validation results via special journal issues and workshops Need to extend correlative analysis to global network of sites - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Outline 1. Validation Approach 2. Data Available for Validation – high resolution imagery – Outline 1. Validation Approach 2. Data Available for Validation – high resolution imagery – in situ data 3. 4. 5. 6. 7. Intercomparison Activities Data Use Communication Path Forward What works & what needs to be improved? - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

In-situ Observations Validation LAI/f. PAR NPP Remote Sensing ? LAI/f. PAR NPP “Assessing by In-situ Observations Validation LAI/f. PAR NPP Remote Sensing ? LAI/f. PAR NPP “Assessing by independent means the uncertainties of data products” MODIS Land Validation: Level 2 to 4 data products primarily ecosystem variables - Successful validation depends on determining measurement uncertainties for specific uses - Validation of remote sensing land products at a global scale is an unprecedented scientific challenge - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Approach To compare MODIS products with parameters derived from higher-resolution airborne or satellite sensors Approach To compare MODIS products with parameters derived from higher-resolution airborne or satellite sensors and data from ground-based studies at validation ‘core sites’, flux towers, data from literature, etc. - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Land Products Validation Science Team Product EOS Validation Investigator Additional Validation Data Surface Reflectance Land Products Validation Science Team Product EOS Validation Investigator Additional Validation Data Surface Reflectance Vermote Liang, Meyer AERONET Land Temperature Wan Hook Snow & Ice Hall Li, Nolin, Shi BRDF / Albedo Strahler and Muller Liang, Privette (SAVE) AERONET, BSRN, SAFARI Veg Index Huete Schowengerdt Chiba U / land cover helicopter LAI / f. PAR Myneni Gower, Meyer Big. Foot, Krasnoyarsk PSN / NPP Running Baldocchi, Olson Big. Foot, FLUXNET, Ameri. Flux Fire / burn scars Justice Hao SAFARI 2000 Land Cover Strahler Big. Foot, International Groups VCC / VCF Townshend RESAC MODIS Atmospheric King Multiple SAFARI 2000, others MOPITT Drummond Multiple SAFARI 2000, others MISR Diner Multiple SAFARI 2000, others Primary Products Supported - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Based on MODIS Land Team Validation Update for Terra and Aqua, December 2000

• • EOS Land Validation Core Sites Based on existing stations, resources, experts • • EOS Land Validation Core Sites Based on existing stations, resources, experts • • • FLUXNET, AERONET, Big. Foot, LTER, etc. Long-term monitoring Jointly nominated by Instrument and Validation PIs 26 sites stratified by six biomes Promote resource sharing and synergies in validating multiple sensors and products Imagery and in situ data available for many uses, not just validation - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Data for EOS Land Validation Core Sites • Remote Sensing Data Land. Sat 5, Data for EOS Land Validation Core Sites • Remote Sensing Data Land. Sat 5, ETM+, IKONOS, ASTER, airborne sensors, subsetted over the core sites • in situ Site Data Collected by various groups at core sites • Networks • AERONET, FLUXNET, etc. Ancillary Site Data / GIS Layers - site variables - elevation - land cover - reference layers (e. g. , political boundaries, airports, water bodies) - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Remote Sensing Data for Core Sites - ORNL DAAC | Terra Data Products Review, Remote Sensing Data for Core Sites - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Validation Subsetting by MODAPS • EOS Core Sites (200 x 200 km) to EDC Validation Subsetting by MODAPS • EOS Core Sites (200 x 200 km) to EDC • EOS Core Sites and GT-NET sites (11 x 31 km) to UMt and ORNL • LAI Inter-comp. Sites (200 x 200 km) to EDC • SAFARI 2000 Sites (200 x 200 km) to UMd and South Africa Disaster Management Center - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Provided in hdf format, integerized sinusoidal projection

Posting MODIS Products at ORNL DAAC • Subset to 7 x 7 km, re-projected Posting MODIS Products at ORNL DAAC • Subset to 7 x 7 km, re-projected to UTM to relate to field work – ORNL worked with EDC to refine MODIS Reprojection Tool • Reformat into ASCII • Provide a single expanding table for each site-product – rows representing dates – columns values for the 49 pixels – includes QA flags MODIS sinusoidal - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 MODIS Products: – Veg Index – f. PAR / LAI – PSN / NPP – BRDF / Albedo – Surface Reflectance – Surface Temperature – LC/LCC UTM

MODIS 8 -day LAI Product All pixels in 5 x 5 km cutout Green MODIS 8 -day LAI Product All pixels in 5 x 5 km cutout Green = rejected Blue = accepted Data not available Accepted pixels based on QA flags The scatter of blue (3 x 3 km) and green (5 x 5 km) dots shows variability in LAI around the flux tower. Park Falls forest site 08 NOV 2000 – 16 OCT 2001 - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 LAI of center pixel

ORNL DAAC in situ Data • Data needs and schedules defined by working with ORNL DAAC in situ Data • Data needs and schedules defined by working with • • MODLAND Validation scientists Investigators have responsibility to process, document, QA, and provide access to their data Provide Mercury system for search and retrieval, for both in situ and remote sensing data Eventually move Land Validation data to long-term archive (ORNL DAAC) Also provide Regional and Global data sets for modeling as part of ORNL DAAC mission - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

in situ Data for Core Sites - ORNL DAAC | Terra Data Products Review, in situ Data for Core Sites - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Site Characteristics Data Most core validation sites belong to several networks that provide ancillary Site Characteristics Data Most core validation sites belong to several networks that provide ancillary information • ORNL is compiling and providing site characteristics data for the Core Sites – NPP, LAI, f. PAR, phenology, micrometeorology, climatology, soils, vegetation cover, etc. – Data can be used for validating other sensors or for global change research • Assemble metadata – documenting methods, processing, uncertainty, data source – examining relationships between parameters for QA checks - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

FLUXNET 157 Towers - ORNL DAAC | Terra Data Products Review, Jan 7 -8, FLUXNET 157 Towers - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

ORNL DAAC Validation Data • Historical data from literature NPP – 1, 000 site ORNL DAAC Validation Data • Historical data from literature NPP – 1, 000 site estimates – Net Primary Productivity (point and grid) – Leaf Area Index (LAI) • Regional and Global data sets – ORNL DAAC archive • • Climate (7) Vegetation (~100) Soils (9) Hydrology (3) NPP – 7, 000 0. 5º grid cells – 119 data sets registered in Mercury re veg, land use, soil, climate, hydrology, etc. LAI – 1, 000 estimates - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Big. Foot: Linking in situ Measurements, Remote Sensing, and Models • Using ground Big. Big. Foot: Linking in situ Measurements, Remote Sensing, and Models • Using ground Big. Foot - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 measurements, remote sensing, and ecosystem models • Measuring land cover, LAI, f. PAR, and NPP • Scaling from field measurements to 5 x 5 km grid

SAFARI 2000 • Coordinated field campaign in southern Africa with links to MODIS Land SAFARI 2000 • Coordinated field campaign in southern Africa with links to MODIS Land MODIS Atmosphere validation • Intensive campaigns in 1999 - 2001 to examine land-atmosphere interactions • ORNL DAAC provides Mercury for access to: – in situ data collected at field sites – airborne sensors (MAS, Air. MISR) – air chemistry measurements - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

GT-Net NPP Project • Coordinated by GTOS with • • assistance from ILTER Use GT-Net NPP Project • Coordinated by GTOS with • • assistance from ILTER Use hierarchical modeling approach that combines satellite data and in situ observations Sites agreeing to measure NPP in exchange for MODIS products for their site – 25 sites in demo phase - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

LAI/FPAR Network • Joint activity of CEOS LPV and MODLAND • 31 sites participating LAI/FPAR Network • Joint activity of CEOS LPV and MODLAND • 31 sites participating worldwide • MODLAND coordinating Landsat ETM+ acquisitions and MODIS LAI subsets – 12 -18 month pathfinder – leverage existing field campaigns • Workshops: 1998 to 2001 – Proposed MODIS LAI to field LAI inter-comparison - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

MODIS - Model - Data Intercomparison • To validate Level 4 Land Products, daily MODIS - Model - Data Intercomparison • To validate Level 4 Land Products, daily • • photosynthesis and annual NPP Validating results of models embedded in NPP algorithm against other models Activities: – Real-time Validation – Ecosystem Model Data Intercomparison (EMDI) – LAI-Net – GT-NET activities - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Flux-Model-MODIS Comparison Individual Site Data 17 sites • • MODAPS 52 sites 8 products Flux-Model-MODIS Comparison Individual Site Data 17 sites • • MODAPS 52 sites 8 products 11 km x 31 km ISIN, . hdf CDIAC/Ameri. Flux • Model initialization parameters • Weekly micromet data • Initial 0. 5 hr flux data Modeling Groups • 5 groups, more coming • Results posted on Ameri. Flux DAAC/FLUXNET • MODIS products – 7 x 7 cutouts • FLUXNET gapfilled data • Links to field data via Mercury Additional validation data - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Comparison Workshop ? April 2002

User Statistics for Validation Data • Use of Mercury • Referrals to registered data User Statistics for Validation Data • Use of Mercury • Referrals to registered data and • documentation Data downloads of remote sensing images of core sites - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Validation Investigators Whose Data are Registered in Mercury (number of data sets indicated if Validation Investigators Whose Data are Registered in Mercury (number of data sets indicated if >1) Aber, John Ahl, Douglas Augustine, John A. Baldocchi, Dennis Bruegge, Dr. Carol J. Burrows, Mr. Sean (5) Cohen, Warren B. (4) Conel, Dr. James E. Feldkirchner, Drew C. (3) Gaitley, Barbara J. Gower, Dr. Stith T. (8) Gregory, Matthew J. Honda, Dr. Yoshiaki Huete, Dr. Alfredo R. (6) Jenkins, Julian Kajiwara, Dr. Koji Kirschbaum, Alan A. (3) Knjazihhin, Yuri Liang, Dr. Shunlin Mackay, Dr. David Scott Maiersperger, Thomas K. (4) Meyer, Dave (4) Moran, Susan Morisette, Dr. Jeffrey T. (11) Myers, Daryl R. - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Myneni, Ranga B. Olson, Richard J. (2) Privette, Dr. Jeffrey L. (4) Qin, Wenhan Robbins, Cullen (4) Thome, Dr. Kurtis J. Townshend, Dr. John R. G. Turner, David P. Walter-Shea, Elizabeth A. Wylie, Bruce (3) al-Abbadi, Dr. Naif

Validation Data through Mercury • 57 validation data sets registered in Mercury – Land Validation Data through Mercury • 57 validation data sets registered in Mercury – Land Validation – 49 data sets – SAFARI 2000 – 5 data sets from NRA selectees – ORNL DAAC Regional and Global Data – 3 • User statistics – July – December, 2001 – 1, 386 searches – 333 users - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Mercury Searches

Types of Referrals July 1 – November 30, 2001 (388 referrals, 49 unique users) Types of Referrals July 1 – November 30, 2001 (388 referrals, 49 unique users) - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Most Referred Data Sets July 1 - December 31, 2001 (388 referrals, 49 unique Most Referred Data Sets July 1 - December 31, 2001 (388 referrals, 49 unique users) Rank Data Set Title Referrals 1. Leaf Area Index (LAI) Data for Big. Foot Sites, 1999 -2001 47 2. Compiled Meteorological Data for Big. Foot Sites 35 3. FPAR Data for Big. Foot Sites, 2000 -2001 33 4. Biomass Data for Big. Foot Sites, 1999 -2000 28 5. MQUALS Exotech Radiometer Data for Jornada LTER, New Mexico 22 6. Aboveground Net Primary Production (ANPP) for Big. Foot Sites, 1999 -2001 16 7. Aboveground Net Primary Production (ANPP) for Big. Foot Sites, 1999 -2000 13 8. HARV ANPP data for 2000 13 T 9. Global Land Cover Test Sites (GLCTS) Data Products (AVHRR, MSS, TM, DEM, and Land Cover Maps) for EOS Land Validation Core Sites 11 T 9. MODIS Land Data Products (MODLAND) for EOS Land Validation Core Sites 11 - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Products downloaded from EDC by Core Site since Oct 99 Total Volume MODIS Files Products downloaded from EDC by Core Site since Oct 99 Total Volume MODIS Files ETM+ Scenes 385 30 GB - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 95 Source: MODIS Science Team Meeting, Dec 01

Communications • Guidance for data providers • Publishing validation results • ‘Popular articles’ for Communications • Guidance for data providers • Publishing validation results • ‘Popular articles’ for the general user community - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Guidance for Data Providers • • • Archiving Ecological Data and Information. Olson and Guidance for Data Providers • • • Archiving Ecological Data and Information. Olson and Mc. Cord. Chapter VII. In Michener and Brundt (ed. ) 2000 “Ecological Data”. Blackwell Science. Managing Data from Multiple Disciplines, Scales, and Sites to Support Synthesis and Modeling. Olson et al. 1999. RSE. Big. Foot Field Manual. Campbell et al. 1999. ORNL TM Guidelines for Submitting Tabular Data. Cook et al. 2001. ESA Bulletin Mercury help and tutorial Web pages - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Publishing Future Validation Results • Special section in IEEE TGARS • Spring/Summer 2002 • Publishing Future Validation Results • Special section in IEEE TGARS • Spring/Summer 2002 • requirement that all related data be registered and available via Mercury • • EMDI Workshop, April 2002 SAFARI 2000 Meeting, October 2002 Flux/Model/Data Intercomparison Workshop ? Other venues? - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Earth Observatory and NASA News articles feature: • MODLAND validation • FLUXNET database by Earth Observatory and NASA News articles feature: • MODLAND validation • FLUXNET database by Rachel Hauser, September 24, 2001 http: //earthobservatory. nasa. gov/Study/Fluxnet/ by Rachel Hauser, September 19, 2001 http: //earthobservatory. nasa. gov/Study/MODISCalibration New NASA Field Campaign August 2, 2001 Sees the Forest for the Satellite - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Path Forward - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Path Forward - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Data resources for on-going validation (Terra, Aqua, NPP, etc. ) • Make use of Data resources for on-going validation (Terra, Aqua, NPP, etc. ) • Make use of extant data • EOS Land Validation Core Sites should be • • • maintained, although EOS Investigations have either expired or will in early 2002 Without formal “validation investigators” we need stronger connections with users who can provide feedback FLUXNET and Big. Foot have continued funding More collaboration with CEOS Land Product Validation Subgroup - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

• Increase the quality and economy of global satellite product validation – develop • Increase the quality and economy of global satellite product validation – develop and promote international standards and protocols for field sampling, scaling, error budgeting, data exchange, and product evaluation • Advocate mission-long validation programs for current and future earth observing satellites Using EOS Land Validation Core Sites as an example to establish the ‘CEOS Land Validation Core sites’ - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002 Pilot projects • LAI • Fire / burn scars • Land cover

Validation. . . what works • Growing buy-in to the ‘core sites’ concept • Validation. . . what works • Growing buy-in to the ‘core sites’ concept • Exploitation of in situ networks (e. g. flux towers, AERONET) and field investigations (e. g. , LBA, SAFARI 2000) • International partnerships and coordination • Simplified data access with dedicated archives • Frequent communication between Product PIs, Validation PIs, and data facilitators - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Validation. . . on-going concerns • 26 core and ~150 towers sites is a Validation. . . on-going concerns • 26 core and ~150 towers sites is a relatively small • • number of sites, but it still takes a lot of effort Spatial differences / scaling - points vs. cells, and the need for a wide variety of ecosystem sites Temporal differences - satellite vs. field data Data inconsistencies - methods, variables, formats More data / better knowledge = greater cost – How much is enough? – Global representation – how many points in time, space, and biome? - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Validation. . . on-going concerns (con’t) • Control expectations • • • – It Validation. . . on-going concerns (con’t) • Control expectations • • • – It takes a couple of years to validate a 1 -yr Level 4 product – What’s the end point for validation? . . . will continually refine? Stronger interface to the user community and on-going collaboration with the international community Improve formal documentation and availability of results Consider establishing a ‘permanent’ NASA Office on Calibration and Validation - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002

Comments. . Questions? - ORNL DAAC | Terra Data Products Review, Jan 7 -8, Comments. . Questions? - ORNL DAAC | Terra Data Products Review, Jan 7 -8, 2002