?: z-values in layer and model

[Fredrik]

I started building a drawing with coordinates from the map. This went out troublesome when looking at the drawing in 3D, so I put it to origin(0,0), but looking at the drawing from the side, I got a z value I could not set to zero(0,-1841). In the info palett the z value was at zero.

Is this a sort of global and local z-value? If so, how can you get to control it? I do not find a good source for this understanding in the manual.

For making a situation-plan with map-coordinates, how is this best done?

1. Start in 0,0 and make another workingplane with other values?

2. Draw with 3D artifacts only and put the locus points in the right-valued position. (Is the drawing a mix of 2D and 3D, command-6 will put you in far distance from the site, including both origin and map-coordinates.)