Michael Fawcett wrote:
On Thu, Aug 27, 2009 at 3:55 PM, DE<satan66613@yandex.ru> wrote:
i implemented very accurate direct and inverse geodetic problem routines (as well as geocentric (X, Y, Z) to geodetic (B, L, H) conversion) i used bessel's method to derive the formulas 6 iterations for both direct and inverse routines is enough to converge to full double precision (16 digits) however the formulas themselves provide 9 significant digits that is 1cm accuracy regardless of range (i.e. range = 1m..20000km) to get acceptable accuracy, say, 2 iterations is enough (or even 1)
Do you mean transformations or projections? Our library GGL (Generic Geometry Library), aimed for Boost, has (about 100) projections (converted from Proj4). But proj4 datum transformations are not yet converted. So it might be useful to see if your transformations would fit into our library. There were already questions about transformations.
By the way: GGL has an own mailing list which can be found here: http://lists.osgeo.org/mailman/listinfo/ggl, a wiki and ticket system which be found here: http://trac.osgeo.org/ggl/ . Sources are at boost (Preview 4): https://svn.boost.org/svn/boost/sandbox/ggl/ and the latest version is still hosted at Geodan SVN (interested people can have access; it will be also moved to Boost sandbox in ~ october).
however there are several other aspects uncovered (area and perimeter, projections, etc.)
Do you have plans to support WGS84? What about Vincenty?
--Michael Fawcett
GGL has Vincenty distance calculations but you probably mean transformations here? Regards, Barend