The spatial software NTv2Poly replaces the rectangular
activity scope contained in NTv2 files with a
Polygonal Validity Scope, which is realized with an
outline file in classic Shape Format. Invalid
calculations outside the Polygonal Validity Scope thus
can be excluded or acknowledged by a warning. Download
the trial version from
http://www.killetsoft.de/zip/ntv2poly.zip. Read the
Worksheet at http://www.killetsoft.de/t_1808_e.htm.

Using NTv2 grid files it is possible to transform
points from one coordinate reference system to another
with very high accuracy. An NTv2 file contains one or
more quasi-rectangular coordinate grids which are
defined in the NTv2 headers. Instead of a rectangular
area only an embedded polygonal area should and must
be covered, for example, a state territory within the
country borders.

The program NTv2Poly realizes Polygonal Validity
Scopes in NTv2 files. Using so prepared NTv2 files,

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