A surface reflectance standard product from LDCM and

A surface reflectance standard product from LDCM and supporting activities Principal Investigator Dr. Eric Vermote Geography Dept. , University of Maryland Co. P. I. Dr. Chris Justice Geography Dept. , University of Maryland

Rationale for the research activities • A Surface Reflectance standard product developed for MODIS provides the basis for a number of higher order land products for global change and applications research • It is possible to develop an operational robust, globally applicable and fully automated code for integration into the LDCM processing chain and the code made openly available for others to use (e. g. LDCM ground stations). • The approach has already been testing by the LEDAPS project.

Atmospheric effect has a strong impact on remotely sensed data MODIS Granule over South Africa (Sept, 13, 2001, 8: 45 to 8: 50 GMT) RGB no correction for aerosol effect RGB surface reflectance (corrected for aerosol) Corresponding aerosol optical thickness at 670 nm (0 black, 1. 0 and above red) linear rainbow scale. Clouds are in magenta, water bodies are outlined in white.

BOREAS ETM+ scene Scene: p 033 r 021 Date: 09/17/2001 Top-of-atmosphere TOA Surface Reflectance

Approach for the surface reflectance product • Atmospheric correction consistent with the MODIS and NPP approach, ensuring consistent reflectance data across resolutions based on rigorous radiative transfer http: //6 s. ltdri. org http: //rtcodes. ltdri. org/

Approach for the surface reflectance product • Validation and uncertainties estimates. Theoretical error budget, comprehensive evaluation.

Approach for the surface reflectance product http: //mod 09 val. ltdri. org/cgi-bin/mod 09_c 005_public_allsites_onecollection. cgi about 5000 cases analyzed

Preliminary evaluation of the LEDAPS ETM+ surface reflectance product • DATE. PATH/ROW • • • • a 2000122. w 2 p 041 r 036 0. 0932345 a 2000122. w 2 p 041 r 037 0. 162749 a 2000170. w 2 p 009 r 029 0. 0449007 a 2000191. w 2 p 028 r 035 0. 0858729 a 2000247. w 2 p 036 r 038 0. 0365191 a 2000261. w 2 p 022 r 039 0. 0722956 a 2000267. w 2 p 048 r 026 0. 0727889 a 2001155. w 2 p 034 r 036 0. 105914 a 2001216. w 2 p 029 r 030 0. 133025 a 2001217. w 2 p 036 r 025 0. 0797376 a 2001218. w 2 p 043 r 028 0. 0735507 a 2001267. w 2 p 034 r 032 0. 0717833 a 2001278. w 2 p 015 r 033 0. 147011 AOT TIMEDIFF AERONET SITE 15 15 60 30 205 14 14 29 14 188 254 14 15 Rogers_Dry_Lake-001221821. mie UCLA-001221823. mie Kejimkujik-001701451. mie Cart_Site-001911659. mie Tucson-002471753. mie Stennis-002611628. mie Saturn_Island-002671842. mie Sevilleta-011551737. mie Sioux_Falls-012161656. mie Bratts_Lake-012171728. mie Rimrock-012181817. mie BSRN_BAO_Boulder-012671730. mie GSFC-012781537. mie

Preliminary evaluation of the LEDAPS ETM+ surface reflectance product Band 3 Band 4

Preliminary evaluation of the LEDAPS ETM+ surface reflectance product Filtered for water pixels (using a simple threshold in band 3 and 4 ) but the cloud mask has not been applied

R and D Areas Extend validation/evaluation exercise and develop fully automated procedures Refine the Cloud/Cloud shadow algorithm Establish absolute radiometric calibration to the 2% level Operational implementation of the adjacency effect correction Coastal water retrievals Aerosol type inversion

Summary The objectives of this proposal are summarized in the following seven tasks: 1. 2. 3. 4. 5. 6. 7. to provide an algorithm and code for a Surface Reflectance Standard Product for integration into the LDCM processing system. prior to LDCM launch, to test the proposed approach on the Middecadal Global Land Survey (MDGLS) Phase 3. to validate the resulting LDCM product, using data from AERONET to provide a cloud masking and cloud shadow screening algorithm for LDCM to undertake vicarious calibration of the LDCM instrument to advise on and contribute to the LDCM program outreach and explore the potential synergy with other high resolution international earth observation programs (e. g. through the GOFC/GOLD and IGOL programs). to be an active contributor to the LDCM Team, participating in telecons, science team meetings and working groups as appropriate.