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- W745610236 abstract "The MODIS daily albedo product is a data layer in the MOD10A1 snow-cover product that includes snow-covered area and fractional cover as well as quality information and other metadata. It was developed to augment the MODIS BRDF/Albedo algorithm (MCD43) that provides 16-day maps of albedo globally at 500-m resolution. But many modelers require daily albedo, especially during the snowmelt season when the albedo is changing rapidly. Many models have an unrealistic albedo feedback in both estimated albedo and change in albedo over the seasonal cycle context, Rapid changes in cover extent or brightness challenge the MCD43 algorithm; over a 16-day period, MCD43 determines whether the majority of clear observations was snow-covered or snow-free then only calculates albedo for the majority condition. Thus changes in albedo and cover are not portrayed accurately during times of rapid change, therefore the current MCD43 product is not ideal for work. The MODIS daily albedo from the MOD10 product provides more frequent, though less robust maps for pixels defined as snow by the MODIS snow-cover algorithm. Though useful, the daily albedo product can be improved using a daily version of the MCD43 product as described in this paper. There are important limitations to the MOD10A1 daily albedo product, some of which can be mitigated. Utilizing the appropriate per-pixel Bidirectional Reflectance Distribution Functions (BRDFs) can be problematic, and correction for anisotropic scattering must be included. The BRDF describes how the reflectance varies with view and illumination geometry. Also, narrow-to-broadband conversion specific for on different surfaces must be calculated and this can be difficult. In consideration of these limitations of MOD10A1, we are planning to improve the daily albedo algorithm by coupling the periodic per-pixel albedo from MCD43, with daily surface ref|outanoom, In this paper, we compare a daily version of MCD43B3 with the daily albedo from MOD10A1. and MCD43B3 with a 16-day average of MOD10A1, over Greenland. We also discuss some near-future planned enhancements to MOD10A1." @default.
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- W745610236 date "2009-01-12" @default.
- W745610236 modified "2023-09-27" @default.
- W745610236 title "Enhancement of the MODIS Daily Snow Albedo Product" @default.
- W745610236 hasPublicationYear "2009" @default.
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