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TitleScene identification and clear-sky compositing algorithms for generating North America coverage at 250m spatial resolution from MODIS land channels
AuthorLuo, Y; Trishchenko, A PORCID logo; Khlopenkov, K V; Park, W M
SourceProceedings of SPIE, the International Society of Optical Engineering vol. 6677, 2007, 11 pages,
Alt SeriesEarth Sciences Sector, Contribution Series 20070275
MeetingSPIE, Earth Observing Systems XII; San Diego, California; US; August 26-30, 2007
Mediaon-line; digital
File formatpdf
Subjectsgeophysics; remote sensing; satellite imagery; spatial filtering; LANDSAT imagery; MODIS
AbstractA 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.

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