It seems like this problem could have been caught early on had someone written a simple test program to compare Geoid09 results against Geoid12 result...

Agreed. Those guys are very analytical.

I should clarify item #1 in my previous post. For a 3D adjustment you need some sort of vertical data at or to every non fixed (1D or 3D) station. Wha...

'Invalid Floating Point' is probably being caused by a division by zero operation. Since you are performing a 3D adjustment, verify the following:1) D...

I would explain to the client that a by-product of an adjustment (assuming least squares) is the statistical information generated. These statistics a...