FITS square pixel grid (15x15), in blue
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FITS (Flexible Image
Transport System) is the IAU standard for data interchange in
astronomy.
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Data values in a FITS image array occupy a regular N-dimensional
lattice structure.
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Ordered so that the first axis varies fastest (FORTRAN order).
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Best thought of as an array of delta sampling functions on a square
grid.
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For display purposes
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Delta functions are represented as finite-sized, square
pixels (not rectangular or hexagonal).
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By convention, the first pixel is at lower-left, increasing to the
right, then upwards.
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FITS keywords:
NAXIS, NAXISj.
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