Page 69 - 3DF Zephyr

and color the point cloud accordingly. The 'Plane' metric instead is a bit different. In this case a plane is fitted considering B and its neighbors. The distance is then calculated from A to the fitted plane. The latter is useful with buildings and walls. Match objects center This tool can be used after creating a photogrammetric dense point cloud and importing then a laser scanner cloud. It often occurs that a scan has been acquired in a different reference system compared to the one of the photogrammetric dense point cloud. This is why sometimes users are not able to see the imported scan into the Zephyr's 3D room. The "match objects center" tool allows to move the imported scan closely to a structured object, namely the photogrammetric dense point cloud. Point cloud registration using control points When dealing with very noise photogrammetry point cloud or excessively planar surfaces (building facades), you may want to use control points prior the ICP alignment. In this case, the alignment via control point takes just a few clicks and can vastly improve the results. The first step is to put at least three control points on the first point cloud you are dealing with. Depending on what you are doing, you might want to move the photogrammetry point cloud rather than the laser point cloud. Regardless of this, you will have to then apply the same control points over the other point cloud. In this example, we start by importing the unstructured laser scan point cloud inside Zephyr. After this is done, it is then possible torescale the imported point cloud and position it near the photogrammetry point cloud ( although this is not mandatory ) The next step is now to select three control points. You may pick the control points with