 In recent years, advances in robotics, computer vision, and sensor technology have enabled the use of unmanned aerial vehicles, UAVs, for capturing ultra-high spatial and high spectral resolution data. This development has led to a revolution in geospatial data collection, whereby many different types of users are now able to access data that fits their needs. However, the diversity of sensors and applications poses a challenge to ensuring the quality of collected data. To address this issue, it is important to develop and communicate standardized procedures that have been proven successful in scientific experiments and operational demonstrations. This paper reviews the state-of-the-art methods in UAV spectral remote sensing and discusses sensor technology, measurement procedures, geometric processing, and radiometric calibration, drawing upon the literature and over a decade of experimentation. The authors also reflect on the current revolution in remote sensing and identify trends, potential opportunities, and limitations. This article was authored by Helga Ossin, Asia Hankevara, Arco Lucia, and others. We are article.tv, links in the description below.