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TitleA method for downscaling MODIS land channels to 250 m spatial resolution using adaptive regression and normalization
AuthorTrishchenko, A PORCID logo; Luo, Y; Khlopenkov, K V
SourceRemote Sensing for Environmental Monitoring, GIS Applications, and Geology VI; by Ehlers, M (ed.); Michel, U (ed.); Proceedings of SPIE, the International Society of Optical Engineering vol. 6366, 636607, 2006, 8 pages,
LinksDonnées MODIS Data - NASA Distributed Data Archive Center (DAAC)
Alt SeriesEarth Sciences Sector, Contribution Series 20060210
Mediapaper; on-line; digital
File formatpdf
SubjectsNature and Environment; remote sensing; regression analyses
ProgramCanadian Space Agency, Government Related Initiative Program (GRIP)
ProgramEnhancing resilience in a changing climate
AbstractA method is proposed to derive spatially enhanced imagery for all seven Moderate Imaging Spectroradiometer (MODIS) land spectral bands at 250 m spatial resolution. Originally, only bands B1 and B2 [visible (VIS) at 0.65 µm, and near-infrared (NIR) at 0.85µm] are available from MODIS at 250 m spatial resolution. The remaining five land channels (bands B3 to B7) are observed at 500 m resolution. The adaptive regression is constructed for each individual MODIS L1B granule of 500 m spatial resolution by splitting the area into smaller blocks and generating nonlinear regression between bands B3 to B7 and B1, B2 and NDVI. Once a set of regression coefficients is generated based on 500 m image, it is then applied to 250 m data containing only channels B1 and B2 to produce five intermediate synthetic channels (B3 to B7) at 250 m spatial resolution. The final step involves normalizing the generated 250 m images to original 500 m images to preserve radiometric consistency. It is achieved in two stages and ensures that downscaled results are unbiased relative to original observations. The developed method was applied to generate Canada-wide clear-sky composites containing all seven MODIS land spectral channels at 250 m spatial resolution over the area of North America 5700 km by 4800 km.

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