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Forums >> Revit Building >> Technical Support >> Topo surface points change from relative to absolute elevations

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Thu, Apr 7, 2016 at 2:33:19 PM | Topo surface points change from relative to absolute elevations

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beachbim


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WWHub, you don't understand hgrimberg's problem. Balazs does and we all seem to be in the same boat with this.  I've been having the same problem with topo elevation points being relative so some imaginary datum when they are activated.  This is indeed a glitch that Revit developers still have not resolved but here may be a solution:

http://forums.augi.com/archive/index.php/t-118136.html

jetisart
2010-05-05, 06:27 AM
Correct. Toposurface points when editing the surface only display the project elevation values. This has been a long-standing issue with topo editing in Revit.It can be solved by using separate site and building files linked together. The toposurface can be modeled using the real elevation points and then placed at the correct elevation in the building file, with the projects' coordinates shared between each file.Although I really support the version with linked files and use it every day myself, there is a simple way to create it in a single file.1) Create your DATUM LEVEL and name it something like "Sea Level" (in Australia is called "AHD" - Australian Height Datum) or any other name that you will know it's a DATUM.2) Create your SITE PLAN based on this DATUM.3) Create your topo in the Site Plan.4) Create all your required separate levels for your building (Ground Floor, Top Plate, Upper Level, etc.) that are NOT based on Datum (Datum = 0!!!)Then you have independent and true toposurface and contours and independent (should be locked together) building levels.Really easy!
patricks
2010-05-05, 01:28 PM
Although I really support the version with linked files and use it every day myself, there is a simple way to create it in a single file.1) Create your DATUM LEVEL and name it something like "Sea Level" (in Australia is called "AHD" - Australian Height Datum) or any other name that you will know it's a DATUM.2) Create your SITE PLAN based on this DATUM.3) Create your topo in the Site Plan.4) Create all your required separate levels for your building (Ground Floor, Top Plate, Upper Level, etc.) that are NOT based on Datum (Datum = 0!!!)Then you have independent and true toposurface and contours and independent (should be locked together) building levels.Really easy!How would that work if you're already well into schematic design by the time you get your site survey? That's typically how it goes around here.
jetisart
2010-05-05, 02:41 PM
How would that work if you're already well into schematic design by the time you get your site survey? That's typically how it goes around here.Simply! CREATE a new level, call it DATUM and make sure its elevation is 0.00. You can even pin it and make it invisible, so nobody messes around with it. After all, this level NEVER changes, does it? Make it shared though...Create view SITE PLAN view based on this DATUM (NOT Level 1 or Ground Floor or any other level).Create site plan in your view SITE PLAN. I even go further and create EXISTING SITE PLAN and NEW SITE PLAN (for obvious reasons) - both based on DATUM LEVELThen all other levels can be moved independently of your DATUM and your SITE.It really is very simple - I used to do it like that for years, before I convinced myself to linked files. I even teach how to do it at school and all other Revit teachers adopted this technique. It's a good technique for beginners, who are too "green" to comprehend linked files concept.

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