I am processing currently a project for which I have received GCPs from a surveyor. The Horizontal Coordinate System of the GCPs is NAD83 and Vertical Coordinate System is NAV88. Now I can select NAD83 successfully as the Horizontal Coordinate System for the Output, but I don’t have the option to select the NAV88 system. The only vertical coordinate systems available are egm84, egm96, egm2008.
Could you let me know if I should enter a different coordinate system or will the processing in egm96 be similar to NAV88 if the coordinates are inserted? The total vertical altitude is about 1.4ft off but is the curvature also different? If not, the use of GCPs should correct the altitude. I could also convert my GCPs in egm96, but I have to deliver results in NAV88 - so converting wouldn’t solve the problem.
Thanks in advance for your support on this question.