The development and transfer of new technologies is crucial to the economic success of the agricultural sector. Many efforts are currently being made to create methodologies and tools for controlling productivity, nutritional and water status, health aspects or crop forecasts. In this scenario, Unmanned Aerial Vehicles (UAVs) are playing a promising role, given the advantages of obtaining aerial images with high spatial resolution combined with low investment costs compared to other acquisition methods. This book, therefore, aims to explain this new technology, as well as developing a methodology capable of accurately estimating plant height in a commercial corn field at two different flight heights, 30 and 60 meters.