All maps are wrong. Get used to it! Maps are an abstraction of the real world and as such only approximate reality. Each layer of orthos or LiDAR data comprises dozens, if not millions, of measurements about location.
LiDAR is the technology of choice for deriving highly accurate terrain data and 3D models. However, combined hardware and software improvements in digital aerial cameras and digital photogrammetry offer new point cloud possibilities.
The American Society for Photogrammetry and Remote Sensing (ASPRS)'s fourth edition of the Manual of Remote Sensing (MRS) will be designed and executed as an enhanced e-book and will focus on three parts: systems, data management and applications.