The defense glossary

Battle Damage Assessment (BDA) is the process of evaluating the damage caused to a target after a military strike or operation. It helps determine whether the mission achieved its objective and if additional action or follow-up strikes are required. BDA is a key part of combat assessment and is used to measure the impact of lethal or non-lethal force on enemy assets, infrastructure, systems, and operational capability.

Counter-battery spotting is a military process used to detect and locate enemy artillery, mortars, and rocket launchers after they fire. It tracks the trajectory of incoming projectiles and calculates the exact launch position for rapid counter-attacks. This system connects battlefield reconnaissance with counter-battery fire operations. By identifying enemy firing locations quickly, counter-battery spotting helps forces respond before hostile units relocate using “shoot-and-scoot” tactics.

Crop monitoring is the continuous observation and assessment of crop growth, plant health, and field conditions. It uses technologies such as satellites, drones, sensors, and remote sensing systems to collect agricultural data. Instead of depending only on manual field inspections, crop monitoring provides timely, data-driven insights. Farmers can use this information to detect crop stress, identify potential problems, track development, and make faster decisions. This approach improves field management and supports more efficient agricultural practices.

A dam inspection is a structured examination of a dam and its surrounding components to assess safety, structural integrity, and operational condition. Inspections help identify potential problems before they become serious safety hazards or expensive repairs. Inspectors may assess structural movement, internal erosion, seepage, mechanical equipment, and other critical elements. Regular dam inspections support early fault detection, maintenance planning, and risk management. They help ensure dams continue operating safely and reduce the likelihood of structural failure.

A High-Altitude Long-Endurance (HALE) UAV is an unmanned aerial vehicle designed to operate at very high altitudes, usually above 50,000 to 60,000 feet. These drones can remain airborne for long durations ranging from over 30 hours to several weeks or even months. HALE UAVs are used for continuous surveillance, communication support, intelligence gathering, and wide-area monitoring. They function like low-altitude pseudo-satellites while offering lower operational costs compared to space-based satellite systems.

Medium Altitude Long Endurance (MALE) UAVs are military drones designed to operate at altitudes between 10,000 and 30,000 feet for long-duration missions, often exceeding 24 hours. These drones are mainly used for Intelligence, Surveillance, and Reconnaissance (ISR) operations and precision strike missions. MALE UAVs provide continuous aerial monitoring, target tracking, and battlefield intelligence, making them important assets between short-range tactical drones and high-altitude strategic systems.

A mini UAV is a compact, lightweight unmanned aerial vehicle designed for man-portable operations. It can typically be carried and launched by a single person without specialised launch equipment. Definitions vary across military and civil aviation frameworks based on weight and intended use. NATO commonly classifies mini UAVs as aircraft weighing 2 kilograms or less. Some civil frameworks use broader small-drone categories covering aircraft weighing up to 25 kilograms.

A multirotor, also called a multicopter, is a rotorcraft that uses multiple rotors to generate lift and achieve flight. Unlike conventional helicopters, multirotors typically use fixed-pitch propeller blades instead of complex variable-pitch mechanisms. They control movement by independently changing the speed of individual motors. These speed variations adjust thrust and torque across the rotors. This allows multirotors to control altitude, direction, rotation, and tilt while maintaining stable and precise flight.

A nano drone is an extremely small unmanned aerial vehicle (UAV) designed for compact operations and lightweight flight. These drones typically weigh less than 250 grams, with many models weighing under 100 grams. Their compact dimensions allow them to measure only a few centimeters or inches across. Nano drones are used for indoor inspection, surveillance, research, education, and recreational flying. Their small size makes them highly portable and suitable for operations where larger drones are impractical.

An orthomosaic in drone mapping is a high-resolution aerial image created by stitching together many overlapping drone photographs. The final image is georeferenced, meaning it matches real-world coordinates and locations. Unlike normal aerial photos, an orthomosaic removes camera tilt and lens distortion to create an accurate top-down map. This allows users to measure distances, areas, and objects precisely, similar to working with a CAD-based map or survey drawing.

Pipeline monitoring drones are specialized unmanned aerial vehicles (UAVs) used to inspect oil and gas pipelines for leaks, damage, and security threats. These drones use technologies such as LiDAR, thermal cameras, and gas detection sensors for real-time inspection and monitoring. They can cover long pipeline routes quickly and safely compared to ground teams or helicopters. Pipeline drones help detect corrosion, erosion, leaks, and unauthorized activity while reducing operational cost and inspection time.

Surveillance drones are unmanned aerial vehicles (UAVs) used for real-time monitoring, threat detection, and security operations. These drones are equipped with thermal sensors, high-zoom cameras, and AI-based analytics systems. They are widely used in law enforcement, border security, industrial monitoring, and critical infrastructure protection. Surveillance drones range from portable short-range systems to tethered and fixed-wing platforms designed for long-duration automated patrol and continuous aerial observation.

Thermal reconnaissance drones use infrared (IR) cameras to detect heat signatures from people, vehicles, animals, or objects. These drones can operate in darkness, smoke, fog, and low-visibility conditions where normal cameras fail. They provide real-time thermal imaging based on temperature differences instead of visible light. Thermal drones are widely used for surveillance, search and rescue, firefighting, border monitoring, wildlife tracking, and industrial inspection operations.