Search and Rescue Drones with Thermal Imaging
By Joshua Duttry
IT Director and UAS Specialist, La Plata County Search and Rescue
Search and Rescue Drones with Thermal Imaging are transforming how modern SAR teams operate in challenging environments. At La Plata County Search and Rescue (LPCSAR), our UAS team has been steadily evolving into a regional leader in drone-based SAR operations, offering capabilities that support ground teams, enhance situational awareness, and reduce search times, all while improving safety for both rescuers and subjects. Our use of non-standard optical payloads like thermal (FLIR), near-infrared (NIR), and multispectral sensors reflects a forward-thinking approach to backcountry emergencies, and we’re proud to serve as a model for other SAR teams across Colorado and beyond.
Thermal or visible light, our drones don’t just fly at night, they reveal what the darkness tries to hide. This side-by-side shows how our team finds heat signatures and confirms targets using onboard spotlights.Thermal Imaging in Action
Real-World Impact: How Thermal Imaging Enhances SAR Effectiveness
Thermal imaging isn’t science fiction, it’s life-saving technology. By detecting heat signatures, thermal-equipped drones help spot lost or injured individuals, even in low-light or zero-visibility conditions. In densely forested areas or at night, human eyes or visible spectrum optics may fail. But a trained thermal operator can identify the subtle contrast between a human heat signature and the surrounding environment.
LPCSAR conducts extensive training exercises in rugged terrain using thermal optics to identify simulated subjects hidden in tree cover, behind rock outcroppings, or camouflaged in sagebrush. These drills have highlighted the unique strengths of thermal imaging: pinpointing recently traveled trails, detecting residual heat from recently occupied spots, and distinguishing wildlife from human profiles.
No flashlight. No moonlight. Just body heat. This is how our UAS team sees through darkness, trees, and terrain to find missing people faster and more effectively.Understanding Thermal Camera Capabilities: Not All FLIR is Equal
One of the biggest misconceptions we encounter is the idea that “thermal can see through trees.” It can’t. What it can do is detect differences in temperature that may be visible through gaps in the canopy or over open terrain. But the capability of the sensor matters.
A 640×512 thermal sensor with a high refresh rate and a narrow field-of-view lens offers significantly better performance than a 320×240 unit with a wide lens. This is not just about resolution, it’s about the ability to detect, differentiate, and track. That’s why choosing the right equipment is vital when fielding Search and Rescue Drones with thermal Imaging.
SAR teams looking to adopt FLIR should understand that specifications like thermal sensitivity (NETD), optical zoom pairing, and radiometric capabilities dramatically affect mission success. “Buyer beware” is essential in this field; underpowered sensors can lead to missed detections or false positives.
Behavioral Insights: Why Thermal Imaging Aligns with Lost Person Behavior
Subjects often act unpredictably. They may sleep, hide, or become unresponsive due to injury, fear, or hypothermia. These behaviors make visual identification difficult, especially at night or in poor conditions.
Thermal optics provide an advantage by detecting body heat rather than relying on movement or color contrast. We’ve used thermal UAS in training scenarios to simulate these situations and confirm that even immobile subjects hidden in low cover can often be identified via their heat signature, something traditional searchers might walk past.
This ability to find individuals who aren’t calling out, waving, or visible is one of the most psychologically significant contributions Search and Rescue drones with thermal imaging bring to field operations.
Expanding Optical Tools in SAR
Leveraging Near Infrared and Search and Rescue Drones with Thermal Imaging
NIR sensors, more commonly used in agriculture or forestry, have untapped value in SAR. These sensors can detect subtle differences in vegetation health and ground disturbance, such as a recently trampled trail. In our region’s varied terrain, including alpine meadows, ponderosa pine forests, and red rock canyons, these capabilities offer new methods of locating clues.
We’re exploring how NIR might support forensic tracking, blood detection under specific conditions, or identifying recently disturbed ground. Though not as widely used as thermal yet, multispectral sensors represent an exciting frontier for future SAR tools.
This subject is standing in total darkness. But to our drone’s sensors, they’re fully lit. Using near-infrared (NIR) illumination, our UAS team detects and confirms targets without blinding ground crews or giving away position.Situational Awareness at the Command Level: Streaming Thermal Video to IC
One of the most powerful ways UAS supports SAR is by giving real-time data to Incident Command. Our team streams live thermal video to command posts using tools like Eagle Eyes and portable Starlink systems. This enables Search Management Team members to observe terrain, evaluate search sectors, and make live decisions about asset deployment.
In terrain where handheld radios fail and cell service is nonexistent, this aerial intelligence is invaluable. Incident Command doesn’t have to wait for post-mission reports or secondhand relays, they see what our drones see in real time.
Training, Tools, and Team Evolution
Myths and Misunderstandings About Thermal Imaging in SAR
We often hear phrases like “Thermal sees through walls” or “You can see someone breathing from a mile away.” While thermal is powerful, it’s not magic. It can’t see through glass or walls, and its effective range is limited by lens quality, subject contrast, and line of sight.
Our team has learned to manage expectations and educate fellow SAR professionals about how thermal really works. It’s a tool, an incredibly valuable one, but it must be deployed and configured intelligently, with trained operators and realistic performance standards.
Night Operations: A New Frontier for UAS and Thermal SAR
Night missions are among the most dangerous for ground teams, especially in steep or technical terrain. Thermal drones allow us to continue searching when human teams must pause. Our SOPs prioritize safety, and UAS gives us the option to maintain momentum during nighttime operations without risking additional lives.
We’ve conducted night ops in areas such as Hermosa Creek and Junction Creek, using thermal optics to scan open fields, riverbanks, and dense forest edges. The ability to fly legally under Part 107 and agency-specific COAs has been instrumental in enabling this capability. These nighttime efforts are an area where Search and Rescue drones with thermal imaging offer a clear advantage.
Locked in and illuminated, this subject was located in near-total darkness. Drone-mounted spotlights allow us to confirm heat signatures, guide teams in, or provide overwatch without ever putting boots on unstable ground.The Evolution of LPCSAR’s Drone Team
Our UAS program began with lightweight DJI Mini 3 Pros and has since expanded to include the DJI Matrice 4T. In coordination with the La Plata County Sheriff’s Office, we also have access to advanced platforms like the DJI M30T. We’ve adopted video detection tools such as Eagle Eyes and Loc8 to assist in both live and post-flight analysis. To explore how we configure and deploy these tools in the field, including insights into our live detection workflow, read our article on UAS in Search and Rescue (SAR): LPCSAR’s Detection Tools.
Over time, we’ve implemented structured training pathways (Awareness, Operations, Technician, Specialist), SOPs, and mission-ready protocols. Our team is now frequently asked by other Colorado SAR teams about our workflow, tools, and deployment strategies. This reflects our commitment to becoming a regional resource, not just a county asset.
Collaborating Across Agencies with Aerial Thermal Tools
LPCSAR has worked closely with other counties, law enforcement, and fire teams during mutual aid missions. Whether it’s scanning for fireline hotspots or identifying heat signatures in flood zones, thermal UAS is a shared asset for interagency operations.
We’ve found that sharing live feeds with other teams and agencies builds trust and improves outcomes. These relationships have been reinforced through training, joint debriefs, and operational transparency.
From Detection to Ground Support
Detection Operator Skills: Seeing What Others Miss
Using thermal effectively isn’t just about owning the sensor, it’s about interpreting what it shows. Our Detection Operators train to differentiate human vs animal signatures, detect patterns like footprints or tire tracks, and identify residual heat from campfires or vehicles.
This skillset, constantly developing through practice and flight time, turns raw thermal data into actionable intelligence. We emphasize continuous improvement, peer review, and after-action learning as cornerstones of our training pipeline.
To fully capitalize on thermal and NIR capabilities, teams must also master how to fly their UAS with purpose. We’ve outlined strategic flight patterns that maximize visual coverage and detection probability in our article on UAS Search Patterns for Search and Rescue Missions.
Through the eyes of the drone. Every data point on this HUD, altitude, orientation, zoom level, supports our Detection Operator in turning thermal imagery into a confirmed find.From Thermal Hit to Subject Recovery: Bridging the Gap
A thermal hit doesn’t end the mission, it starts the next phase. Once a possible subject is detected, the team must assess access, safety, and extraction routes. UAS provides a bird’s-eye view for this planning, supporting both ground teams and overhead coordination.
We’ve practiced this workflow extensively: Detection, Verification, Ground Team Dispatch, and Command Support. Each step builds on the previous one, and every piece of data helps close the loop.
Enhancing Ground Teams, Not Replacing Them
One important message we share with all SAR teams: drones don’t replace people, they support them. A thermal drone can clear a ridgeline in minutes, but it can’t carry out a hypothermic subject or deliver critical first aid.
We see our drones as a force multiplier. They help our ground teams focus their energy, reduce exposure time, and increase efficiency.
SOPs, Terrain Challenges, and the Road Ahead
SOPs for Safe and Effective Thermal UAS Use
LPCSAR has developed detailed SOPs for drone deployments, especially thermal. These cover battery management, airspace deconfliction, image review, privacy concerns, and nighttime operation protocols. Risk assessment is baked into every UAS mission we fly, and we actively use the GAR model to ensure safety and mission clarity. You can learn more about how we apply this framework in our piece on GAR Risk Assessment in Search and Rescue.
Our SOPs are designed to be shareable with other SAR teams, and we encourage interested agencies to reach out if they’re building or refining their own.
Terrain Matters: Deploying in La Plata’s Harsh Conditions
From our mountain canyons to aspen groves and mesa-top deserts, terrain challenges every flight. We train for high-elevation operations, side-hill hovering, and limited landing zones. Visual observers and terrain-aware flight paths ensure safety and coverage.
In some cases, we hike drones in, hand-launch, and then fly short, targeted missions. Flexibility and environmental awareness are just as critical as sensor quality.
The forest closes in fast. Our drone team operates in places where terrain dictates every move, navigating tight contours, variable winds, and complex airspace to get the mission done.Looking Ahead: The Future of SAR Optics
Emerging technologies, AI-enhanced image analysis, real time mapping, and dual-payload sensors, will change the face of search and rescue. LPCSAR is already integrating some of these tools and testing how they scale in real-world conditions.
We believe the future of SAR will combine highly trained operators, intelligent software, and rugged aerial platforms. Partnerships between agencies, vendors, and local communities will be vital. Search and Rescue drones with thermal imaging will remain at the core of this transformation.
Additionally, you can support LPCSAR by contributing to our Recon for Rescue initiative, which directly funds advanced tools like thermal-capable drones, UAS training programs, and cutting-edge detection software. Your donation helps us reduce search times, improve field safety, and save lives in the backcountry.
We invite you to follow our ongoing missions and behind-the-scenes training on Facebook and Instagram, where we share updates, photos, and ways the community can stay involved. To explore more ways you can connect with or assist our team, including volunteering, sponsoring, or hosting an educational event, visit our Community Outreach page.
Together, we can ensure that no call for help goes unanswered.
He has extensive experience supporting Search Management Team functions, including mission planning, operational coordination, and the integration of air and ground search resources. His work emphasizes practical, field-driven applications of UAS in search and rescue, informed by real-world mission support and ongoing training.
Joshua contributes across multiple SAR teams and disciplines, with a particular focus on bridging technology, aviation, and operational search management to support safe, effective outcomes in the field.