Python method for warping GTiff in NZTM to Web Mercator across the anti-meridian.
Tested additonally warping from EPSG:3994, EPSG 4167
A direct warp from NZTM to Web Mercator will split the file across the globe. This method will create a non-split GTiff extending across the anti-meridian.
Tested using NIWA 250m Bathymetry file from Koordiates
make anti-warp in_file=nzbathy_2016.tif