Many people have heard the terms 3D laser scanning, 3D Surveying, or High Definition Surveying, but exactly what do those terms mean? Do they mean the same thing? What is it all about? Is it magic? Smoke and mirrors? Not exactly. Indeed, mirrors are involved, but this is definitely no illusion. To me, all of the above terms can be used to describe the same cutting edge surveying technique. Throughout this blog I’ll refer to the term High Definition Surveying (HDS).