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lib/Geography/NationalGrid/TW.pm  view on Meta::CPAN

Given a floating point number of degrees, returns a string of the form '51d 38m 34.34s'. Intended for formatting, like:
$self->deg2string( $self->latitude );

=item data( PARAMETER_NAME )

Returns the item from the Userdata hash whose key is the PARAMETER_NAME.

=item transform( PROJECTION )

Transform the point to the new projection, i.e. TWD67 to TWD97 or reverse. Return the point after transformation and keep original point intact. Uses the formula proposed by John Hsieh which is supposed to provide 2 meter accuracy conversions.

=back

=head1 ACCURACY AND PRECISION

The routines used in this code may not give you completely accurate results for various mathematical and theoretical reasons. In tests the results appeared to be correct, but it may be that under certain conditions the output
could be highly inaccurate. It is likely that output accuracy decreases further from the datum, and behaviour is probably divergent outside the intended area of the grid.

This module has been coded in good faith but it may still get things wrong. Hence, it is recommended that this module is used for preliminary calculations only, and that it is NOT used under any circumstance where its lack of accuracy could cause any...