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commit aed288bd301b9e1b6a7dfa3d82a8a571b09e180b Author: Bas Couwenberg <sebas...@xs4all.nl> Date: Fri Oct 17 04:27:52 2014 +0200 Document the limitations of the grid correction files. --- debian/README.Debian | 35 +++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/debian/README.Debian b/debian/README.Debian index 286b91e..e1c0fc1 100644 --- a/debian/README.Debian +++ b/debian/README.Debian @@ -30,7 +30,7 @@ Direct links to the relevant pages: The license contained in the RDNAPTRANS2008.zip file is problematic, because it doesn't allow distribution. The license is documented in the file "Use of RDNAPTRANS2008.doc" (use `antiword "Use of RDNAPTRANS2008.doc"` to -display it in a terminal). It says: +display it in a terminal). Quote: " Use of the name RDNAPTRANSTM2008 @@ -72,7 +72,8 @@ NTv2_2008.zip file contains a different license which limits modification but allows distribution. The license is documented in the file "Use of RDTRANS2008 and NAPTRANS2008.pdf" (use `pdf2txt "Use of RDTRANS2008 and NAPTRANS2008.pdf"` to display it in a -terminal). It says: +terminal). Quote: + " License @@ -130,3 +131,33 @@ To use these definitions with cs2s specify the rnap file: cs2cs +init=rdnap:rdnap +to +init=epsg:4258 cs2cs +init=rdnap:rd +to +init=epsg:4258 +Beware that the transformation procedure is not identical to RDNAPTRANS™2008. + +The file "Use of RDTRANS2008 and NAPTRANS2008.pdf" documents a list of +limitations of the procedure with NTv2 grid correction files. Quote: + +" + 1) The rdtrans2008 NTv2-grid can only give identical results to + RDNAPTRANS™2008 within 1 millimeter at ground level onshore and + at mean seal level offshore. The horizontal deviation is + approximately 1 millimeter per 50 meter height difference from + ground level or mean sea level. + 2) An exception to 1) is the border of the RDNAPTRANS™2008 correction + grid. Transformation results within cells of the rdtrans2008 + NTv2-grid that are intersected by the border of the RDNAPTRANS™2008 + correction grid can result in deviations of up to 20 centimeter. + 3) The naptrans2008 VDatum-grid cannot be used to determine deflections + of the vertical. For this the NLGEO2004 geoid model has to be used. + 4) The naptrans2008 VDatum-grid is referenced to the Bessel-1841 + ellipsoid and cannot be used stand-alone, it has to be used in + combination with the rdtrans2008 NTv2-grid. +" + +The package build includes the mandatory tests documented in Appendix 2 of +"Use of RDTRANS2008 and NAPTRANS2008.pdf". The tests compare the coordinate +transformations by cs2cs to those computed with RDNAPTRANS™2008. + +The transformations by cs2cs produce different results, not identical to +RDNAPTRANS™2008. Failing the test to be identical to RDNAPTRANS™2008 does +not prevent the package build from continuing. + -- Alioth's /usr/local/bin/git-commit-notice on /srv/git.debian.org/git/pkg-grass/proj-rdnap.git _______________________________________________ Pkg-grass-devel mailing list Pkgfirstname.lastname@example.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-grass-devel