Case Study: 15,000 Acre Deer Count at Glen Dessary
A large-scale aerial deer count across three remote Highland glens, combining thermal detection, long-range optical verification, and fully mobile off-grid operations to produce a reliable, decision-ready population dataset.
The Brief: Count Deer Across Three Remote Glens
Aerometrics was tasked with surveying approximately 15,000 acres across Glen Dessary, Glen Pean and Glen Ahurran. The terrain is typical of the Highlands, with steep ground, broken visibility, and limited access, making full coverage difficult using traditional ground methods alone.
The objective was to produce a reliable population count, not just locate deer. This required clear identification of groups, including stags, hinds, calves, and younger animals, across a wide area without disturbing natural behaviour.
Ground teams alone would have faced long traverses, repeated climbs, and restricted visibility into neighbouring glens, increasing the risk of missed or duplicated counts. The count therefore required a method that could move efficiently, see across the terrain, and verify animals with confidence.
A Mobile Survey Platform Built for Estate Work
The operation was built around mobility. An ArgoCat allowed the team to move efficiently between glens while carrying drone equipment, batteries, charging systems, and communications kit. This removed the need for a fixed base and kept the survey progressing with the terrain.
Working from a mobile platform also reduced unnecessary climbing and exposure. The team could remain lower on the ground, reposition quickly, and maintain a steady pace throughout the day, improving both efficiency and safety.
Thermal Detection First, Then Long-Range Verification
The core survey workflow combined two complementary stages. Initial deer detection was carried out using thermal imaging, allowing the team to scan large areas of ground rapidly and identify heat signatures that would be difficult or time-consuming to pick out with the naked eye alone. This was particularly valuable in broken Highland terrain where deer may be partly screened by contours, heather, rock, or distance.
Once animals were identified thermally, they were then verified visually using the DJI Matrice 4TD and its powerful zoom capability. The aircraft allowed the team to assess deer from roughly 300 to 500 metres away, close enough for confident classification but far enough to avoid pushing unnecessarily into the animals and altering their behaviour.
That visual verification stage was critical. It meant the count was not based on heat signatures alone. Deer could be sexed, calves could be distinguished, and younger stags could be noted, producing a more useful and defensible result for the estate than a simple total headcount.
Across the operation, the deer count showed that the Estate had a well managed deer poplation. The same workflow also picked up other species on the estate, including wild boar and foxes, adding wider wildlife intelligence beyond the primary survey brief.
A Reliable Method for Large-Scale Highland Counting
The strength of this approach was that it combined speed with confidence. Thermal scanning made it possible to cover broad areas efficiently, while the zoom lens provided the detail needed to verify what had actually been found. That pairing is what made the count useful. Without verification, thermal can tell you something is there. With verification, it becomes survey-grade information that can be acted upon.
Structured Data Capture in the Field
To maintain accuracy across such a large area, sightings were not simply observed and remembered. Intelligent markers were used during the operation to log deer positions directly on the map, helping the team build a live picture of what had already been counted and where. This was an important safeguard against duplication, especially when working across adjoining ground where groups may move between observations.
By marking deer in real time, the survey became more than a sequence of flights. It became a structured mapping exercise with a clear record of detections, classifications, and location context. That is what turns a drone sortie into a usable dataset.
Connectivity was another challenge that had to be solved properly. The estate has no conventional mobile signal, so a Starlink Mini was used to maintain data access and keep connectivity to DJI FlightHub available throughout the operation. In a remote Highland environment, that kind of live link is not a luxury. It helps keep planning, oversight, and data handling streamlined when the ground conditions are otherwise working against you.
Power resilience was equally important. A dedicated charging station built into the Argo kept batteries rotating throughout the day, allowing the drone system to remain operational with effectively zero downtime between flights. That matters on jobs like this, because every unnecessary pause costs coverage, daylight, and momentum.
Weather, Airspace, and Keeping the Survey Moving
Highland conditions were unsettled throughout the survey, with rain and shifting visibility forming part of the operating picture. The DJI Matrice 4TD proved well suited to the task, allowing flights to continue in conditions that would have grounded less capable aircraft and helping the survey stay on schedule.
That all-weather capability is a real advantage in Scotland, where waiting for ideal conditions is rarely practical. The estate also sits within a tactical low flying zone, so operations were coordinated with the RAF to deconflict activity and maintain safe, controlled flying throughout.
Outcome
The result was a clear and structured deer count across a large, challenging estate, completed more efficiently and with less ground risk than traditional methods alone. Deer were identified, classified, and logged, while the wider workflow demonstrated the value of combining thermal search, optical verification, mobile support, live connectivity, and continuous field charging in one coherent survey system.
- Surveyed approximately 15,000 acres across three challenging Glens
- Identified two species of deer, including sex and younger classifications
- Used thermal detection with 120x zoom from roughly 300 to 500 metres
- Logged sightings with intelligent markers to reduce duplication
- Maintained off-grid connectivity using Starlink Mini
- Kept batteries charging from a mobile setup with zero downtime
- Continued operations in rain with a weather-resistant enterprise drone
- Coordinated safely with the RAF within the tactical low flying environment
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If you need accurate deer population data for estate management, conservation planning or reporting, get in touch with details of the land area and survey objectives. We will advise on timing, approach and expected outputs before providing a clear quote.
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