Common scenario; you toggle between a spot coordinate > Coordinate Origin > Project or Relative. In many cases the value remains the same and you wonder where it is pulling the origin from?
First, WikiHelp has some documentation on Spot Elevation Type Properties; from the link:
“Elevation Origin
If the origin value is set to Project, then the elevation reported is with respect to the project origin. If set to Shared, then the elevation reported is with respect to the shared origin. If the base value is set to Relative, then the elevation reported is with respect to the level in the Relative Base instance parameter. You can change the shared origin by relocating the project. See Relocating and Mirroring a Project.”
Typically the easiest method to visualize this is in relation to the Revit Project Base Point. First we will use a Spot Coordinate in this simple example:
Project
The spot coordinate reports the distance from the Project Base Point. So if you unclip and move the project base point, the spot coordinate will report the distance between the two.
Simple video follows:
Relative
The spot coordinate reports the distance from the Project Startup Location. This is the fixed “origin”. The Project Base Point distance is not calculated in this example.
Simple video follows:
The one additional item to keep in mind is in regards to a Spot Elevation, which has the same Coordinate Origin options.
As mentioned in WikiHelp, when you set the Elevation Origin to Relative, a parameter becomes active called Relative Base. Because a spot elevation displays the elevation, when you choose Relative you have the additional ability to align this to a project level.
For example:
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