VIIRS Land Products

Miguel Román, PhD NASA Goddard Space Flight Center Pre-Launch Evaluation of the NPP VIIRS Land and Cryosphere EDRs to Meet NASA’s Science Requirements

with contributions from the VIIRS Land Team # : Chris Justice, Ivan Csiszar, Jeff Privette, Mark Friedl, Chengquan Huang, Jerry Zhan, Louis Giglio, Pierre Guillevic, Crystal Schaaf, Dorothy Hall, Tomoaki Miura, Jeff Key, Alexei Lyapustin, Jim Maslanik, George Riggs, Peter Romanov, Igor Appel, Eric Vermote, Wilfrid Schroeder, Robert Wolfe, and Yunyue Yu #Support for the activities underpinning this talk was provided by the JPSS Data Products and Algorithms Division and NASA’s Science Data Segment via the Land PEATE (Product Evaluation and Algorithm Test Element).

[object Object],[object Object],[object Object],[object Object],[object Object],NPP Cal/Val Phases NPP-VIIRS Land/Cryosphere Products (1) Land Surface Temperature (LST) (2) Surface Type (7) Albedo (3) Active Fires (ARP) (8) Vegetation Index (4) Surface Reflectance (9) Snow Cover/Depth (5) Ice age (10) Ice Concentration (6) Ice motion (11) Ice Surface Temperature Late 2011

[object Object],[object Object],[object Object],NPP Land PEATE

[object Object],[object Object],[object Object],Data Continuity will require Algorithm Continuity

The following is a summary of the VIIRS Land Cal/Val and Science Team’s findings to date (July, 2011) with respect to the utility of the Land and Cryosphere EDRs to meet NASA’s science requirements .

[object Object],[object Object],[object Object],Land Surface Temperature (LST) EDR Observed LST is angle dependent Apparent Emissivity Apparent LST ,[object Object],[object Object],VIIRS LSTs from MODIS as proxy See Bob Yu’s talk: (WE3.T09 – 7/27) LST Retrieval from SEVIRI, as proxy of VIIRS

[object Object],[object Object],[object Object],[object Object],[object Object],VIIRS Surface Type EDR ,[object Object],[object Object],[object Object],from Zhan, Huang, and Friedl

[object Object],[object Object],[object Object],[object Object],[object Object],Surface Albedo EDR MODIS Proxy (PGE 363 - 2007177) Shortwave Broadband White-Sky Albedo MODIS 0.05deg WSA 2007-177 (PAR) MODIS 0.05deg WSA 2007-177 (NIR) from C. Schaaf

Vegetation Index EDR ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],TOA-NDVI TOC-EVI MODIS proxy TOA-NDVI & TOC-EVI (2007-177) -0.2 1.0 0 0.5 0.75 0.25 from T. Miura

[object Object],[object Object],[object Object],[object Object],[object Object],Surface Reflectance IP VIIRS Surface Reflectance ASRVN VIIRS Surface Reflectance Accuracy, Precision, and Uncertainty (APU) Metrics ,[object Object],[object Object],from Wang and Lyapustin APU (GSFC Site, 2007-193)

[object Object],[object Object],[object Object],[object Object],[object Object],VIIRS SDR Geolocation Landsat TM/ETM Image chips are used for Ground control points > 1200 Ground control points from R. Wolfe (see Mash’s talk – FR1.T05 7/29)

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],VIIRS Ice Characterization EDR Examples of ice thickness (left) and ice age (right) over the Arctic. J. Key et al.

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],VIIRS Ice Surface Temperature EDR VIIRS MODIS The surface temperature over part of the Antarctic ice sheet and surrounding sea ice derived from MODIS data with a VIIRS-like algorithm. J. Key et al.

[object Object],[object Object],[object Object],[object Object],[object Object],VIIRS Snow Cover EDR NPP_SRFLIIP_L2, surface reflectance Land PEATE , VIIRS PROXY DATA, 2003-033 NPP_VSCM_L2, Binary Snow Cover, Land PEAT, VIIRS PROXY DATA, 2003-033 snow-red, snow-free-green, not snow-blue NPP_VSCD_L2, Snow Cover Fraction, Land PEAT, VIIRS PROXY DATA, 2003-033 snow-red, snow-free-green, not snow-blue from J. Key, P. Romanov, and D. Hall

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Active Fires EDR Examples of NPP VIIRS proxy and corresponding Aqua MODIS active fire data in East-Central Africa on September 6, 2002 AVAFO_npp: 12:25:56 – 12:30:11 MYD14_aqua: 12:25:00 – 12:30:00 VIIRS MODIS L. Giglio (UMCP ) and I. Csiszar (NOAA)

From Sensor Data Records… ,[object Object],[object Object],Aircraft Campaigns in Support of VIIRS Cal/Val Efforts … to Global Land Products (AMS/Ikhana) Simulated Bands: - ETM+ B1-B4 - MODIS B27 - VIIRS M15-M16 (CAR/P3-B) Simulated Bands: - ETM+ B1-B4 - MODIS B1,B2,B3,B5 - VIIRS I2, M3, M5, M7-8 Active Fires + Burned Area Surface Reflectance, VI, BRDF, and Albedo - Development and testing of standard products (L2+). Provides critical in-situ data for multi-sensor validation and intercomparison studies . IFOV: 17.5 mrad FOV: 190.0˚ GIFOV: 4.0-500 m IFOV: 2.5 mrad FOV: 85.9˚ GIFOV: 50 m

Campaign Efforts (LST-EDR) ,[object Object],[object Object],[object Object],Aircraft flights to characterize LST spatial variability Challenges: Automatic validation using the USCRN sites Bondville, IL Chestnut Ridge, TN from P. Guillevic (NOAA) UTSI aircraft

[object Object],[object Object],[object Object],[object Object],[object Object],VIIRS Land Team Findings

VIIRS Land Products

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