Negative elevations because levels

[davidivons]

Hi.

I'm having problems with the elevations of my surface, as it assumes an elevation of 0.0m on a level line with an elevation equal to 79.00m. In this way my vertices assume wrong elevations. And the part of the surface that is below the level line still has negative values. Does anyone know how I can fix this? Thanks.

[barthbradley]

Huh? Post some pictures so we can follow along. 

[davidivons]

 Hi.

    See, the surface is assuming this level (+79,750) as a base, when it should assume the level +00.00.
    Remembering that the elevation is correct, both the house and the surface are at the elevation they should be.
    However, taking this level (+79,750) as a base causes their elevations to appear wrong on the panel.
And that's getting in the way of surface modeling.

[ToanDN]

Topography points are based on Internal Origin.  Level elevations are based on either Project based point or Survey point.  These three are not necessary the same.

[barthbradley]

The Toposurface Internal Points (the one inside Sketch Mode) are ALWAYS relative to the Internal Origin of the Project. Ignore them.  Just move the completed Toposurface down in Elevation View to where it is supposed to be at IN RELATION TO THE BUILDING. 

Note: Contour Labels and Spot Elevations are relative to their Elevation Base, which is typically the Survey Point. So, if your Toposurface's real-world Elevations are relative to Sea Level you might want to move your Survey Point down to Sea Level in Elevation View too.  In other words, if the Building Site Pad is 1000 ft. above Sea Level in the real-world, the Survey Point would be a -1000 ft.  Get it?   

[lim.wendy]

Hi David,

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