Work with Z in World Corrdinates vs. Ground Reference?

[Xap 0]

Is there a way to switch the editor over so that Z is relative to world sea level as 0 vs. the current ground offset reference?  Or is there some way to use the editor tools to snap align objects together over uneven terrain so they are all at the same height and aligned perfectly?

For example, placing piers that are all in a line at the same exact elevation.  Because the elevation is relative to the ground surface at the object's center, there is no way (I know of) to figure out what the correct Z value would be for each object along that line. 

Is there an easier way to place objects aligned like this?

[tirpitz 15]

There is a snap to feature which seemed to work for me and I think there is a way to switch to posasl

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