PRECISION
AERIAL MAPPING

A drone aerial mapping survey begins with a site assessment and flight plan. Before any aircraft leaves the ground, our pilot reviews the survey area using satellite imagery and airspace data, identifies any restricted zones or obstacles, and designs a flight path that will achieve the required ground sample distance (GSD) — the level of detail captured per pixel. For most construction and land development surveys, a GSD of 2 to 5 centimetres per pixel is standard. For planning submissions or land registry work requiring higher precision, we fly at lower altitude to achieve 1 centimetre GSD.

On the day of the survey, the pilot deploys ground control points (GCPs) — physical markers placed at known GPS coordinates across the site. These are used during processing to georeference the final outputs with centimetre-level accuracy. Without GCPs, accuracy degrades to 5–15 centimetres or worse, which is insufficient for engineering or planning purposes. Our standard survey includes a minimum of five GCPs for sites up to 10 hectares, with additional points for larger areas.

The drone then flies the pre-planned grid pattern autonomously, capturing overlapping images at 70–80% front overlap and 60–70% side overlap. This overlap is what allows the photogrammetry software to reconstruct the scene in three dimensions — the more overlap, the more reference points the software has to work with, and the more accurate the final model. A typical 10-hectare site survey takes 45 to 90 minutes of flight time, depending on altitude and wind conditions.

Post-flight, the raw imagery is processed using specialist photogrammetry software — typically Agisoft Metashape or Pix4D — to generate the deliverable outputs. This processing step is computationally intensive and typically takes 4 to 12 hours for a standard site, depending on image count and the complexity of the terrain. Our standard turnaround from flight to delivered outputs is 24 to 48 hours.

Accuracy and quality assurance

Every aerial mapping survey we deliver includes a quality report documenting the achieved accuracy against the GCPs. This gives clients verifiable evidence of the survey's positional accuracy — important for engineering design, planning submissions, and any application where the data will be used as a legal or contractual record. Our standard accuracy specification is ±2–5cm horizontal and ±3–7cm vertical with GCPs, which meets or exceeds the requirements of most construction, infrastructure, and land development applications.

When is drone aerial mapping the right choice?

Drone aerial mapping is the most cost-effective method for capturing accurate spatial data over areas from 1 to 500 hectares. Below 1 hectare, traditional ground survey methods are often faster and cheaper. Above 500 hectares, fixed-wing drones or manned aircraft become more efficient. For the vast majority of construction sites, development land, agricultural parcels, and infrastructure corridors, a multi-rotor or fixed-wing drone survey delivers the best combination of accuracy, turnaround time, and cost.

The technology is particularly valuable for sites where ground access is difficult, hazardous, or time-consuming — steep slopes, active construction zones, contaminated land, or large rural parcels where a ground survey team would take days to cover the same area a drone can survey in a single morning.