Does anyone out there know of a program to compute a combined factor without having an opus solution? I've heard there is one somewhere on the NGS toolkit but I'm having trouble finding it. Thanks for any help!
Corpscon should do it.
The NGS Geodetic Toolkit is:
http://www.ngs.noaa.gov/TOOLS
The state plane conversion only provides the scale factor, not combined scale factor.
To calculate a combined scale factor, one can use CORPSCON (ver 6).
Found here: http://www.agc.army.mil/Missions/Corpscon.aspx
With Corpscon 6 read the Know Bugs section. Corpscon can provide a correct CSF when you enter the orthometric height.
Download the program and run checks against some datasheet data.
CORPSCON 6 from the Corps of Engineers does it correctly so long as you select NAVD88 as the output vertical datum to avoid a bug. It always computes from the output vertical number as if it is NAVD88 regardless of what is really selected.
Old thread on subject:
https://surveyorconnect.com/community/threads/corpscon-6-combined-scale-factor-wrong.309050/
Thank you!!