Reference level problem

[Tom Krowka]

Having an odd problem which I haven't had before w/ reference levels. Have Sea level set at zero of course, and am setting references relative to 0.

However, project Zero is greyed out so I can't set it relative to sea level. Have moved the red reference level mark to sea level so all references should be relative to SL, right?

What's up?

Thanks

[Tom Krowka]

Another clue....the sea level and project zero appear to be linked. If I put the reference mark at project zero, I can't change sea level. If I put the reference at sea level, project zero is greyed out and I can't change that. Project zero and sea level appear to be forever linked at zero. I'm sure I'm missing something easy as I haven't had this problem before.

Thanks.

[David Maudlin]

Tom:

Sea Level is set via Project Location > Altitude. In the Help files see: User Interface Reference > Dialog Boxes > Project Preferences Dialog Boxes > Reference Levels Preferences.

David

[Tom Krowka]

Seems counterintuitive as sea level will always be zero, but altitude would be the elevation of the project.

For example in Denver, sea level is still zero, but altitude would be 5000 feet.

[Anonymous]

I agree with Tom. Something seems broken with this feature or done in a confusing way. If I enter 100' in the altitude box(assuming that my project zero wants to be at 100' above sea level) and then go check a slab that is at project zero, I find that the slab is at -100' in relation to Altitude and 0 in relation to Sea Level. Shouldn't that also be -100' above sea level?

We should be able to enter a field that says Project Zero = 100' (above sea level) and be done with it. Why is it locked out in two fields anyway? Seems like it would only lock out the field that you put the red triangle next to.


I guess thge only reason to use altitude is if you get some survey back that is not even related to true elevation, but some other survey monument that has no relation to sea level. But that should be what the datum is. We should be able to create and name multiple user datums and only worry about project zero's distance from sea level.

[Tom Krowka]

Had a conversation with GS Tech support about this. Project zero is always at 0, everything else is relative to it. Altitude is the critical number, enter the value at Project Location. AC then calculates sea level relative to altitude.

It makes a bit more sense that way, but is hard to figure out without some guidance.