Floating/Sinking Buildings in Google Earth

[als]

I know that floating/sinking buildings can be an issue if the terrain
is not on in the sketchup model. I have made sure that the terrain is
on in both the Sketchup model and GE. Most of the buildings are fine
but about 1/3 of them are either floating or sinking. They are not
floating or sinking but much (+ or - 10' in elevation) but it does not
look good when the model is in google earth. Is this just an error that
occurs when you are creating a big model (a 2 mile corridor) or is
there something that can be done?
Any feedback would be helpful...
Thanks,

[Henry Anthony]

als,

Are you toggling the terrain? There is a button that allows you to view
the terrain either flat or in 3d. You need to build your model in
relation to the 3d view in order for it to show properly in GE.

Regards,
Henry

[Gaieus]

Als, when a model is very large (horizontally), the best way is to draw
on the GE snapshot and then push/pull everything to the hight of the
terrain. On top of this pulled surface you can then model your
buildings - since probably in reality they are not at the same
elevation anyway, are they?
Just look at this model here: www.gaieus.hu/egyetem/Belvaros.skp where
I started to reconstruct the Medieval walls of my home town. Obviously
the walls aren't as high as I pulled them from the snapshot but I
needed to do this in order that the walls appear on the surface of the
terrain, too. (Certainly the next step will be that I move the whole
structure down as much as high the walls are, intersect with the
terrain and lift it back again and then erase unwanted geometry - the
very hight of the walls. But I'm still contemplating on some details
because the wall should actually have horizontal tops everywhere - i.e.
it should go on the hillside stepped.)

Gai...