 Advancements in robotics, computer vision, and sensor technology have enabled the development of new spectral remote sensing tools with unprecedented ultra-high spatial and high spectral resolution using unmanned aerial vehicles, UAVs, leading to a revolution in geospatial data collection. However, the diversification of sensing systems and user applications challenges the common application of good practice procedures that ensure the quality of the data. This challenge can only be met by establishing and communicating common procedures that have had demonstrated success in scientific experiments and operational demonstrations. The review evaluates the state-of-the-art methods in UAV spectral remote sensing, discussing sensor technology, measurement procedures, geometric processing, and radiometric calibration based on literature and experimentation. It reflects on the current revolution in remote sensing, identifies trends, potential opportunities, and limitations. This article was authored by Helga Ossin, A. J. Honkabara, Arco Lucier, and others. We are article.tv, links in the description below.