Drones (ISSN 2504-446X) is an international, peer-reviewed, open access journal published monthly online. The journal focuses on design and applications of drones, including unmanned aerial vehicle (UAV), Unmanned Aircraft Systems (UAS), and Remotely Piloted Aircraft Systems (RPAS), etc. Likewise, contributions based on unmanned water/underwater drones and unmanned ground vehicles are also welcomed. 1. Design - onboard sensor design - airframe and structural design - power supply - geometric and radiometric sensors - sensor fusion - calibration of imageries - controlling system - signal/image processing - nano drones or nanotechnology 2. Development - performance - control system - mission planning - security systems - autonomy - navigation and position/orientation - autonomous take-off and landing - artificial intelligent - machine learning - simultaneous localization and mapping - controlled and non-controlled airspace - meteorology - GNSS outages - regulations, and economic impact 3. Applications - environments - agriculture - forestry - geosciences - urban area - logistics - disaster assistance - security and surveillance - architecture - monitoring, change detection - health - marine science - education