Images are made from the NSCAT L1.5 data files and use an h(x,y)=0/1
measurement spatial response function with the SIRF algorithm. For highest
possible spatial resolution, multiple orbit passes are combined. These
are the 'all pass' images. Generally orbit passes of a given point on
the Earth occur at nearly the same time of day.
Images are produced in the BYU .SIR file format
using the standard naming scheme. The files are
gzipped to minimize storage and transfer requirements. The standard images
are designed for land and ice observation and so are landmasked. However,
.SIR format land mask files (containing 0 for ocean and 1 for land) are
available for each standard region. .SIR format images containing "images"
of the latitude and longitude of each pixel for each region are also available. The nominal image pixel resolution is 4.45 km/pixel.
Further information is available in the NSCAT
Enhanced Resolution Image Users Notes.