[Proj] New Zealand Map grid projection

[Hamish]

Frank:
> I don't know what definition LINZ uses for NZGD49 - perhaps
> something more accurate or even a grid shift based file?

there is a single 3 term and a single 7 term covering the entire country,
but a copy of LINZ's grid file can be found here:
  http://download.osgeo.org/proj/nzgd2kgrid0005.gsb
:)

(technically that's for NZGD49 -> NZGK2k IIRC, but that's just GRS80 vs WGS84
so beyond what is meaningful for NZMG (sub-meter) & near enough)


Hamish