Laser scanning is a relatively new technology, having been used as a precise survey instrument only since 1997. It's quickly becoming the new industry standard as a way to make very accurate measurements in complicated environments. This is precisely why using this technology is the best solution for measuring as-built conditions inside buildings. This instrument collects survey data points at a rate of 50,000 points per second. These models are then used to create 2D civil or architectural drawings, 3D computer models, and final survey documents.