Hello ruyi7952,
I'm the author of that article at NovAtel.com, my problem has nothing to do with datum conversions, my question is about the resulting TIFF file that PS will use from geoids folder, shall the TIFF file have some sort of specific format? I can see that in the egm2008-1.tif file the EXIF specifies VERT_DATUM["EGM2008 geoid",2005,AUTHORITY["EPSG","1027"]] in the ImageDescription field, is all what it takes to use a TIFF withi PS?
Thanks
Isaac