| Title | Scene identification and clear-sky compositing algorithms for generating North America coverage at 250m spatial resolution from MODIS land channels |
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| Author | Luo, Y; Trishchenko, A P ; Khlopenkov, K V; Park, W M |
| Source | Proceedings of SPIE, the International Society of Optical Engineering vol. 6677, 2007, 11 pages, https://doi.org/10.1117/12.739507 |
| Image |  |
| Year | 2007 |
| Alt Series | Earth Sciences Sector, Contribution Series 20070275 |
| Publisher | SPIE |
| Meeting | SPIE, Earth Observing Systems XII; San Diego, California; US; August 26-30, 2007 |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Subjects | geophysics; remote sensing; satellite imagery; spatial filtering; LANDSAT imagery; MODIS |
| Illustrations | images |
| Abstract | A new technology has been developed at the Canada Centre for Remote Sensing (CCRS) for generating Canada-wide and North America continental scale clear-sky composites at 250 m spatial resolution of all
seven MODIS land spectral bands (B1-B7). The MODIS Level 1B (MOD02) swath level data were used as input to circumvent the problems with image distortion in the mid-latitude and polar regions inherent to the sinusoidal (SIN) projection utilized for
the standard MODIS data products. The new data products are stored in the Lambert Conformal Conical (LCC) projection for Canada and the Lambert Azimuthal Equal-Area (LAEA) projection for North America. The MODIS 500m data (B3-B7) were downscaled to
250m resolution using an adaptive regression algorithm. The clear-sky composites are generated using scene identification information produced at 250m resolution and multi-criteria selection which depends on pixel identification. Cloud shadows were
also identified and removed from output product. The possible cloud shadow area is determined using geometrical routines and spectral reflectance features. It is demonstrated that new approach provides better results than any scheme based on a single
compositing criterion, such as maximum NDVI, minimum visible reflectance, or combination of them. To account for surface bi-directional properties, two clear-sky composites for same time period are produced for the relative azimuth angles within
90°-270° and outside of this interval. Comparison with Landsat imagery and MODIS standard composite products demonstrated advantages of new technique for screening cloud and cloud shadow and providing the high spatial resolution. The final composites
were produced for every 10-day intervals since March 2000. The composite products have been used for mapping albedo and vegetation properties as well as for land cover and change detections applications at 250m scale. |
| GEOSCAN ID | 224295 |
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