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With
appropriate apparatus, orthophotomosaics created on the desktop
computer from near-range vertical photographs can be used
to plan excavations more quickly than by drawing. A good fit
of adjacent photographs is often impossible when there is
excessive perspective error, and the software "stretches"
we might make to correct this introduce further error. A simple
mathematical model, the Orthographic Approximation, provides
the easy means of determining the metric parameters which
yield a result which is tolerably close to being orthographic,
making the creation of an orthophotomosaic a simple task.
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