Moving 2D lines to zero on Z axis

[bpjewell]

Hi, I have a quick question which I hope there is an answer to, it's a problem that has been annoying me for a long time!

 

The problem is that I am working with OS maps which for some reason are drawn with lines which are scattered all over the Z axis. Each line is in one plane on the Z axis (i.e. both ends of each line have the same Z co-ordinates) but almost every line has a different Z co-ordinate! This causes me majot headaches when I am trying to locate scheme drawings on maps or use objects from these maps in drawings.

 

I know that I can draw over the maps using polylines and get my lines in one plane that way but it is far too time consuming!

 

Is there a quick way to move all the lines to zero on the Z axis without affecting their X and Y co-ordinates?

 

If anyone can help I would be extremely happy!

 

I'm using AutoCAD 2005 by the way.

[dbroada]

you can use "quick select" (right clip menu) to select all line. Then go to properties (another right click) and type 0 in the z co-ord box.

[bpjewell]

Thankyou Dave - you have just become my personal hero!!

[CarlB]

For lines that have endpoints with differing z values (apparently not your case) that method wouldn't work. The Express Tools "flatten" command will work on most every object to change all z values to 0.

[loocifur]

I have used Flatten..Sleected all,but doesnt work..Any other solution?

[ReMark]

There's always the old standby use of the CHANGE command. The option you want to use is called ELEVATION. Set it to zero.

[loocifur]

I got it to work finally..Used Flatten Command..thx for the help..