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Biomass burning releases significant amounts of trace INTRODUCTION gases and smoke aerosol into the atmosphere. This has an Biomass burning causes a wide range of global environ-impact on the Earth's radiation budget, the magnitude of mental impacts (Levine, 1996). Most significantly, vege-which has not yet been well quantified. Satellite remote tation(More)
In preparation for new satellite sensors, such as VEGE-ciated with vegetation, and as an input to ecosystem pro-TATION on SPOT-4 and the MODerate Resolution Im-ductivity models (Sellers et al., 1986; Bonan, 1993; Liu aging Spectrometer (MODIS), we investigate the poten-et al., 1997). The need for LAI information over large tial of the shortwave infrared(More)
Leaf area index (LAI) is one of the surface parameters that has importance in climate, weather, and ecological studies, and has been routinely estimated from remote sensing measurements. Canada-wide LAI maps are now being produced using cloud-free Advanced Very High-Resolution Radiometer (AVHRR) imagery every 10 days at 1-km resolution. The archive of these(More)
We report the results of a modeling study on the sensitivity of normalized difference vegetation index (NDVI) and surface reflectance to differences in instrument spectral response functions (SRF) for various Advanced Very High Resolution Radiometers (AVHRR) onboard the National Oceanic and Atmospheric Administration's (NOAA) satellites NOAA-6 – 16 as well(More)
The radiometric normalization of multi-temporal satellite optical images of the same terrain is necessary for land cover change detection e.g. relative differences. In previous studies, ground reference data or pseudo invariant features (PIFs) were used in the radiometric rectification of multi-temporal images. Ground reference data are costly and difficult(More)
This study presents a comprehensive investigation of res across the Canadian boreal forest zone by means of satellite-based remote sensing. A re-detection algorithm was designed to monitor res using daily Advanced Very High Resolution Radiometer (AVHRR) images. It exploits information from multichannel AVHRR measurements to determine the locations of res on(More)
This paper evaluates annual re maps that were produced from NOAA-14/AVHRR imagery using an algorithm described in a companion paper (Li et al. Burned area masks covering the Canadian boreal forest were created by composit-ing the daily maps of re hot spots over the summer and by examining Normalized DiOE erence Vegetation Index (NDVI) changes after burning.(More)
—Climate change studies require consistent, long time series, surface reflectance data. The characterization of the bidi-rectional reflectance distribution function (BRDF) is important for normalizing the solar radiation reflected from the earth's surface. We evaluated four BRDF models to identify the preferred approach to the normalization of multiyear(More)