It often starts with a simple decision. A large residential subdivision needs supporting visual amenity evidence for a planning application. The site is located in an upmarket suburb with wealthy residents, and the development is likely to be contested at the Victorian Civil and Administrative Tribunal (VCAT). Aerial drone and streetscape photos are quickly captured. Photomontages (composite images that show the insertion of proposed buildings into photographs of existing sites) are prepared, and the proposal appears clear and convincing on screen.
However, as projects progress to VCAT, the fundamental question becomes clear: will aerial photomontages provide the required visual amenity evidence? Drone imagery may appear persuasive, but VCAT panel members may challenge their validity by inquiring about the camera’s location, height, and whether the perspective accurately represents a pedestrian’s or neighbour’s view. This is the crux of the limitations of drone imagery in meeting key evidentiary standards.
Having been an expert witness at VCAT hearings numerous times, I am aware that when evidence, such as drone-based photomontages, is questioned on key points, the strength of the case is weakened. Any unresolved doubts about the methodology risk undermining the proposal’s credibility.
Photomontages are used to help the Tribunal understand the visual impact, built form (the shape and arrangement of the development), and neighbourhood character from specific viewpoints. The methodology for producing these images is critical.
The Gap Between Aerial Impressions and Visual Amenity Evidence
At VCAT, photomontages are used to assess visual impact from specific, identifiable viewpoints. They are relied on to help understand how a proposal would be seen from the public realm and nearby properties, rather than as illustrative or marketing imagery.
This creates a gap between design-stage and Tribunal-ready photomontages. Our surveyors record tripod location, tripod height, and nearby control points. This enables us to replicate these settings in virtual 3D space and ensures the photomontages are clearly understood and, if needed, are reproducible or testable.
If these inputs are missing or if they are unlike human eyesight, demonstrating a photomontage’s accuracy is difficult. It also contradicts VCAT Practice Note PNVCAT2, which governs the methodology for submitting visual evidence.
Why Planning Happens at Eye Level, Not From the Air
Drone photography captures the built environment from above, often at a height significantly higher than a human’s viewpoint. This provides valuable context, but it also changes how buildings are perceived. Height, bulk, and setbacks appear reduced, and the relationship between a proposed building and the street or neighbouring properties can seem softened by the elevated perspective.
Photomontages for planning applications are intended to illustrate how a proposal would appear from a footpath, road, or nearby dwelling. These viewpoints sit within a narrow height range (usually 1.5 to 1.7m depending on the use of the space and outlook) and reflect how people experience scale, overshadowing, and visual bulk. Even a small change in camera height can significantly alter what the frame captures.
This difference in viewpoint is the primary reason that drone photography, on its own, does not meet the requirements for visual amenity photomontages. Aerial views and wide lenses distort scale and perspective, making them unreliable substitutes for the grounded, human-scale imagery that VCAT expects.
Camera Height and Why It Matters
Drone photography makes it challenging to determine the camera’s vantage height in relation to the context. Views even a little above or below typical eye level can dramatically change what is visible—roof forms, upper levels, and the building’s relationship to surroundings. These differences may seem subtle, but they can significantly affect perceptions of height, bulk, and enclosure.
For planning purposes, photomontages are usually based on fixed, ground-level viewpoints that reflect how people experience a place. These viewpoints are typically aligned with pedestrian or driver eye level and are selected to represent common public or neighbouring views.
Drone imagery is inconsistent. Camera height varies between flights and is usually much higher than eye level; wind may also affect the view’s angle. Although altitude data might be recorded, it does not offer the same certainty as a fixed camera and measured tripod height. This makes it difficult to prove a drone image matches a specific, repeatable viewpoint required for planning.
Seeing More, Perceiving Less: How Wide Lenses Change Scale
Lens width affects how scale and distance appear in an image. Most drones have very wide-angle lenses to capture as much of the scene as possible in one frame. While useful for context, this spreads visual information over a wide field of view, making buildings appear smaller, further away, and less dominant than from a human viewpoint.
Human vision works differently. Our field of view is wide, but we focus centrally, maintaining a steady sense of scale. This is called subjective constancy. People intuitively judge height, bulk, and proximity as they move through space. Wide-angle lenses do not replicate this effect, as they compress depth and stretch space in a single image.
Lens selection is critical for planning photomontages. Images for VCAT use calibrated lenses that better match human perception at eye level. Using wide-angle drone imagery without adjustment can soften the proposal’s visual impact, especially since the elevated height may hide street-level details.
When Visual Evidence Is Cross-Examined: Why Drone Imagery Falls Apart
The differences between drone imagery and planning-grade visual amenity photomontages are clear. Drone photographs are taken from elevated spots, use wide-angle lenses, and feature variable camera heights. These factors affect how scale, bulk, and distance are perceived. While helpful for context, drones differ greatly from the fixed, ground viewpoints required for planning.
As projects reach VCAT, visual material is examined more closely by legal and planning experts for objecting parties. Questions focus on how a view was created, if it reflects a realistic human experience, and if it can be explained or revisited. Drone imagery is more challenging to justify, especially when the camera height, lens settings, or viewpoint are not fixed or fully documented.
Environmental and operational factors add complexity. Drone flights depend on weather conditions, site access, airspace restrictions, and the pilot’s decisions. Small variations between flights can change the perspective, alignment, and scale. Flexible capture methods make it more challenging to prove that a drone image shows a precise, repeatable viewpoint, which limits its value under scrutiny.
Accuracy Is a Process, Not an Impression
In planning or VCAT settings, it is not about how impressive an image looks, but how clearly it can be explained and relied upon. Visual amenity evidence must be collected from defined viewpoints, using consistent camera settings, and through a transparent process, allowing images to be tested under scrutiny.
Aerial drone photomontages are valuable for context and early design, but their variable viewpoints, camera heights, and lens characteristics make it harder to meet expectations. The strength of a photomontage is in the clarity of the process behind it, not just the photograph. Engaging visual specialists who understand VCAT expectations early helps ensure photomontages are prepared with scrutiny, not just for show.
To your development and planning success,
Stan Zaslavsky.