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CERES Footprint

Image: CERES Footprint

Figure 1: Area coverage by scan modes
showing cross-track scan.

The CERES footprints are 25-km in diameter near nadir, so that there are more footprints on the boundary of a region than inside the region. Moreover, as CERES scans away from nadir, the footprints grow such that they are not small compared to the size of the region, and the distance between footprints in the scan direction increases. If the footprints are large compared to the region, as illustrated in Figure 1, overlap of the footprints with each other and with the boundaries of the region complicates the problem of computing regional averages. The selection of particular footprints to use at the boundaries of the region and the correlation of values of overlapping footprints needs to be considered. Because of these problems, improved techniques for computing regional averages have been developed (Hazra et al. 1993). At present, error studies are underway to define the degree of improvement which these methods provide.

CERES Data Product Information

  Image: NASA Logo NASA Official: Dr. Norman Loeb
Page Curator: Edward Kizer
Page Last Modified: 11/14/2018 11:28:48 EST
Site Last Modified: 11/14/2018 11:28:59 EST