in this project i have kept both project base point and survey point at ground level , but when creating toposurface when i enter 0 as level , it cretes it at the bottom of the objects . Why is this?
Toposurface elevation measurement differs from levels
Coordinates? I am not following you. Spot Elevations and Contours labels, and what not, report Z distances relative to their "Elevation Base" setting, which is typically the Survey Point. It has nothing to do with the altitude of the Toposurface (or the Toposurface's Internal Point Elevations) in the Project
Thank you so much for the very professional video clip and explanation you ofered . Excuse me for the late follow up as i had to experiment on it for a bit before replying and also had to go to my office, In this project you explanation was quite corrrect , but i also found out what @barthbradley said about the internal origin post which the Revit software wont let you change . So , when you drag the PBP or Survey Point away from the internal origin point , you may set up the datum level at that point by 'specify coordinate point' option and making whatever line of that to be the PBP 'ZERO' . But as @barthbradley said the internal origin point wont move, the topography points still use this internal origin as their absolute orih]gin point . So , You may have to drag whatever 'PBP zero' of the elevation you have created to actually make it same as the 'internal origin zero' and therfore make it same as the level line altitude. I hope what i say make sense. In the screenshot i have done again , you can see that i have set up the foundation level to be zero and also suing the 'specify coordinatepoint' option , you can even right click on the pbp and unclip and set the elevation to zero , it will automatically align itself with this line . But when you right click on it and click 'move to startup location , it will always still go to ththe internal base point of the project( which you cannot move). So i thank you and @barthbradley alot for your discussions ...
