| Title | A method for downscaling MODIS land channels to 250 m spatial resolution using adaptive regression and normalization |
| |
| Author | Trishchenko, A P ;
Luo, Y; Khlopenkov, K V |
| Source | Remote 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, https://doi.org/10.1117/12.689157 |
| Links | Données MODIS Data - NASA Distributed Data Archive Center (DAAC)
|
| Image |  |
| Year | 2006 |
| Alt Series | Earth Sciences Sector, Contribution Series 20060210 |
| Publisher | SPIE |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | Nature and Environment; remote sensing; regression analyses |
| Program | Canadian Space Agency, Government Related
Initiative Program (GRIP) |
| Program | Enhancing resilience in a changing climate |
| Abstract | A 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. |
| GEOSCAN ID | 222676 |
|
|