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The Collection 6 (C6) MODIS (Moderate Resolution Imaging Spectroradiometer) land and atmosphere data sets are scheduled for release in 2014. C6 contains significant revisions of the calibration approach to account for sensor aging. This analysis documents the presence of systematic temporal trends in the visible and near-infrared (500 m) bands of the(More)
The polarization correction for the Moderate-Resolution Imaging Spectroradiometer (MODIS) instruments on the Terra and Aqua satellites is described. The focus is on the prelaunch polarization characterization and on the derivation of polarization correction coefficients for the processing of ocean color data. The effect of the polarization correction is(More)
The NASA ocean color products of SeaWiFS and MODIS Aqua have been reprocessed in 2009 and 2010, respectively. This paper describes the changes to the calibration approach for MODIS Aqua. Due to a significant downward trend in the operational MODIS Aqua water-leaving radiances at 412nm, the previous calibration approach was no longer sufficient. The new(More)
Remotely sensed images with a pixel size of about 1 m can nowadays be acquired by airborne scanners and in the near future also by high resolution satellites. With such a high spatial resolution, remotely sensed data of urban areas can resolve structures like a roof into the different surface segments with different inclinations, e.g. in the case of a(More)
This paper presents results from analyzing hyperspectral BRDF data of grass lawn and watercress. The intensity of the hotspot as a function of wavelength is determined from fitting an empirical (or rather phenomenological) model to the data. The model consists of a lambertian, bowlshape, hotspot and forward scattering component. An analytical, theoretically(More)
The Ocean Biology Processing Group (OBPG) at NASA's Goddard Space Flight Center is responsible for the processing and validation of oceanic optical property retrievals from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) and the Moderate Resolution Imaging Spectroradiometer (MODIS). A major goal of this activity is the production of a continuous ocean(More)
{ Field-observed BRDFs for diierent land cover types are employed to derive a global BRDF/albedo database from land cover classiications. In a second step, AVHRR reeectance observations are used to reintroduce within-class variations into this database by tting the eld-observed BRDFs to the observed bidirectional re-ectances. These databases are useful(More)
  • Gerhard Meister, Rafael Wiemker, René Monno, Hartwig Spitzer, Alan Strahler
  • 1998
To describe the directional reflectance characteristics of a specularly reflecting rough surface, K.E. Torrance and E. Sparrow developed a BRDF model based on geometrical optics. In this study their model is confirmed by a ray-tracing-like simulation, using the same assumptions as in the analytical derivation. We also present a simple empirical function(More)
For the years 1997 to 2000 it is expected that a number of new satellites will be launched into orbit by private companies which are specified to deliver panchromatic imagery of the earth surface with a spatial resolution as fine as 1 m. In contrast to the panchromatic band, the spectrally resolved bands will have a four times coarser ground resolution.(More)