2005 ARM Science Team Meeting, March 14-18, Daytona Beach, Florida Canada Centre for Remote Sensing - Centre canadien de télédétection Geomatics Canada.

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2005 ARM Science Team Meeting, March 14-18, Daytona Beach, Florida Canada Centre for Remote Sensing - Centre canadien de télédétection Geomatics Canada Natural Resources Canada - Géomatique Canada Ressources Naturelles Canada Contact Information: Alex Trishchenko, Tel (613) , Spectral, temporal and spatial properties of surface BRDF/albedo over the ARM SGP area from multi-satellite observations Introduction Surface albedo serves as an important input for atmospheric radiation and climate modeling and analysis. The characterization of spectral, temporal and spatial properties of surface bi-directional reflectance (BRDF) and albedo was the major objective of our project. In the poster we will summarize our efforts to characterize surface BRDF and albedo properties over the ARM Southern Great Plaines (SGP) region of 30-40°N, °W from multiple satellite missions: MODIS on Terra and Aqua, VGT, AVHRR, Landsat and ASTER, as well as from ground observations. Our approach was to generate 10-day BRDF/albedo maps with resolution 500m from MODIS and 10-days, 1-km resolution maps from VGT, AVHRR from 1995 to The landcover-based fitting approach is implemented to derive BRDF/albedo parameters. We will present analysis of multiyear datasets and discuss spectral, temporal and spatial variability of surface albedo over the ARM SGP area. The consistency and discrepancy between different satellite datasets will be considered. 4 field campaigns (Intensive Operational Periods -IOP) have been conducted to gather landcover and surface albedo information of various seasons and for validation purpose. Multi-angular sensor data (MISR) and high spatial resolution imagery (LANDSAT and ASTER) and some aircraft observations have been also used to validate satellite-derived products. VEGETATION/SPOT4 MODI S 36N 38N 34N 96W94W 98W100W Trishchenko, Alexander a, Luo, Yi b, Li, Zhanqing c, Park, William a, and Khlopenkov, Konstantin a a Canada Centre for Remote Sensing, b Noetix Research Inc., Canada, c University of Maryland Available satellite/sensors and time spanPlatform/Sensor Time Span Surface Resolution Spectral Band (  m) Terra/MODIS m 0.4, 0.5, 0.6, 0.8, 1.2, 1.6, 2.1 Aqua/MODIS m SPOT/VGT km 0.4, 0.6, 0.8, 1.6 NOAA/AVHRR km 0.6, 0.85, 3.7 Landsat Selected dates 30m 0.4, 0.5, 0.6, 0.8, 1.6, 2.2 Aster Selected dates 15m, 30m 14 bands VIS, SWIR, TIR Surface albedo (NIR) of May through 1995 to Comparison of albedo between VGT and MODIS Validation of albedo with ground measurements 5/11/2003Wheat field5/11/20035/12/2003GrasslandYoung corn field Validation of albedo with MISR observations Landcover type around ARM-SGP CF during three IOPs derived from Landsat and ASTER images and ground survey Landcover types around ARM-SGP CF, Sep 2002 Spectral response function of different sensors Spectral correction of Landsat bands to MODIS bands Landsat-7 Surface Reflectance 30-m Pixel Landsat-7 Surface Reflectance 500-m Aggregation MODIS Surface Reflectance 500-m Pixel Landsat-7 vs MODIS Surface Reflectance Summary  Surface BRDF/albedo products over the ARM SGP area 30-40°N, °W have been generated from multiple satellite missions: MODIS on Terra and Aqua, VGT, AVHRR from 1995 to Spatial resolution is 500m for MODIS and 1km for other sensors. Temporal resolution is10-day interval (3 per month).  The landcover based BRDF fitting (LBF) approach has been developed. Method can be easily applied for joint data processing from multiple platforms. Spectral correction procedure has to be implemented to merge data from similar but not identical sensors to account for spectral response function effect.  BRDF/albedo results were compared with ground measurements and observations from other sensors. The primary results show good agreements. Some additional validation efforts are required to reduce variability between different missions.  Generated BRDF/albedo data have been released through the CCRS ftp site: ftp.ccrs.nrcan.gc.ca/ftp/ad/CCRS_ARM/Satellites/, and are being transferred to the ARM data centre archive. Reference Luo, Yi, Trishchenko, Alexander P., Latifovic, Rasim, Li, Zhanqing, Surface bidirectional reflectance and albedo properties derived using a land cover–based approach with Moderate Resolution Imaging Spectroradiometer observations. J. Geophys. Res., Vol. 110, No. D1, Spectral albedo by ground measurement for various landcover types MODIS SSFR aircraft Ground obs Landsat ETM+ ARESE-II Aerosol IOP Comparison of MODIS and ECMWF albedo over the GCM box centred at SGP CF. MODIS data (in consistency with ground observations) show diurnal cycle of albedo and variations due to sky-conditions (direct/diffuse ratio and spectral distribution). Model data lack such properties. Satellite, airborne and ground comparisonSatellite and GCM comparison