Hi all, I want help in identification and deletion of zero elevation points in drawing file containing approx. 30,000 points. Regards

Is the drawing being worked on in Civil3D?

I am working in AutoCAD2013 for the drawing dear Mr. John.Regards

Could you tell us a little more about these zero elevation points?  What are they exactly?  Geometry?  Text?  Other?  Is this a 2D or 3D drawing?

These are like 3D survey data points having x, y and z values. There are approx. 30,000 points out of which, it is expected that 2,500 points are having zero elevation. These points are to be deleted before the data can be used for further work.Regards  

Have you tried using QSELECT?

Thank you Sir John. Your suggestion for applying QSELECT command has worked like hitting the bull's eye.Regards

Good to hear that your problem has been solved.