This article was published in ESRI's ArcUser magazine in 2016. It can be accessed through the ESRI website.
Abstract:
Unmanned aerial systems (UAS) are demonstrating their value for capturing high-resolution aerial imagery and 3D terrain content for GIS and other uses. However, the wide variety of hardware, software, and regulations related to UAS can be baffling. If you want to start exploring the use of UAS for GIS, this brief explanation will get you off the ground.