Canada’s airborne survey industry spans geophysical exploration, aerial photography, elevation mapping and the aviation services needed to carry sensors over a project area. Terraquest, Geotech and Airborne Sensing operate in parts of this market, but their services address different requirements.
The distinction starts with the information being collected. A mining company investigating geological structure needs a different measurement from a municipality mapping surface features or an infrastructure owner inspecting a corridor. The aircraft enables the survey; the sensor, collection plan and processing determine what the customer can learn from it.
This also shapes the supplier relationship. A survey company may deliver the complete project, while a helicopter operator or aerospace engineering business supplies one part of the work. Comparing providers therefore requires a view of both the measurement and the responsibilities included in the contract.
Canadian Airborne Survey Companies and Their Services
| Company | Main service relevant to airborne surveys | Where it fits |
|---|---|---|
| Terraquest | Magnetic, electromagnetic, radiometric and gravity surveys | Airborne geophysical data acquisition and processing |
| Geotech | Airborne geophysical surveys using several sensor methods | Survey planning, acquisition and delivery of geophysical data |
| Airborne Sensing | Aerial photography and image-based mapping | Imagery for environmental, infrastructure and land applications |
| Acasta HeliFlight | Helicopter support, including geophysical bird towing | Flight operations and sensor carriage |
| Quaternion Aerospace | Aerial sensing and surveying, alongside UAS engineering | Uncrewed-aircraft sensing and project integration |
The first three companies provide useful starting points for comparing geophysical and image-based work. Acasta and Quaternion illustrate how aviation operations and engineering can form separate parts of a survey project.
Terraquest: Airborne Geophysics
Based in Markham, Ontario, Terraquest offers geoscientific data acquisition and processing using fixed-wing aircraft and helicopters. Its published portfolio includes magnetic, electromagnetic, gamma-ray spectrometry and gravity systems. The company lists aircraft including the King Air C90, Piper Navajo and Cessna U206. Terraquest’s survey capabilities.
That combination gives a customer several possible survey configurations. The starting point is the geological problem: which physical property needs to be measured, across what area, and at what resolution? The choice of aircraft follows the collection requirement and operating conditions.
Geotech: Geophysical Methods and Project Planning
Geotech’s quotation guidance covers magnetic, electromagnetic and gravity work, with information requirements extending from the project boundary to flight-line spacing and local logistics. It also distinguishes mobilization, standby and survey activity.
This makes the scope of the project central to the commercial comparison. Two proposals can cover the same area while differing in line spacing, collection method, processing or the treatment of weather delays. Those differences can change both the price and the usefulness of the resulting dataset.
Airborne Sensing: Photography and Photogrammetry
Toronto-based Airborne Sensing publishes aerial-photography services for applications including watersheds, forests, wildlife, infrastructure and land development. Its imaging offer includes colour and infrared products. Airborne Sensing’s applications.
Its photogrammetric workflow combines positioning information, image processing and ground control to produce mapping outputs such as orthophotos and digital surface models. Here, the commercial output is a usable map or model, with its value tied to the accuracy, collection date and detail needed for the customer’s task.
Airborne Geophysics, Photogrammetry and LiDAR Compared
These methods answer different questions. Geophysics measures physical properties associated with the ground and geology. Photography records visible or sensor-specific surface information. Photogrammetry uses overlapping images to derive measurements and three-dimensional geometry.
Light detection and ranging, or LiDAR, uses laser measurements to generate three-dimensional data. Point clouds and elevation models can support terrain and infrastructure analysis; the US Geological Survey’s 3D Elevation Program illustrates the range of applications for this class of information.
| Method | Main information sought | Examples of outputs |
|---|---|---|
| Magnetic, electromagnetic, gravity or radiometric survey | Physical patterns relevant to geological investigation | Corrected measurements, maps and interpretation where included |
| Aerial photography | Surface conditions at the time of collection | Images, mosaics and orthophotos |
| Photogrammetry | Measurements and geometry derived from imagery | Surface models and three-dimensional image products |
| LiDAR | Three-dimensional surface and elevation information | Point clouds, elevation models and derived features |
A project can combine methods. Imagery may help a team interpret the setting of a geophysical survey, while elevation data can support a separate engineering requirement. The additional dataset is useful when it resolves a specific question; adding sensors alone does not make a survey more informative.
Aircraft Operators and Survey Providers
The division of work becomes particularly important when a sensor requires a specialist flight operation. Acasta HeliFlight’s services include geophysical bird towing: carrying a survey instrument beneath a helicopter. Its flight operations are conducted under Canadian Helicopters Limited.
That arrangement brings the aircraft, crew and external-load operation into the project. Sensor operation, data processing and geological interpretation can still sit with other parties. The contract needs to connect those responsibilities so that a problem in the final data can be traced to the relevant stage.
Uncrewed aircraft systems (UAS) create another route to collection. Quaternion Aerospace lists aerial sensing for environmental and infrastructure applications alongside engineering services. For this type of project, the choice of platform depends on the area, payload, endurance and operating conditions. A drone survey and a crewed-aircraft survey can overlap in purpose without offering the same coverage or carrying the same instrument.
What Affects the Cost of an Airborne Survey?
Survey cost follows the collection plan and the work required to turn measurements into a useful product. Area alone is an incomplete basis for comparison: the same boundary can require very different amounts of flying and processing.
Line Spacing and Acquisition Scope
Closer flight lines generally increase the distance flown over a defined area. The method and desired detail determine whether that additional collection is useful. A proposal needs to connect its acquisition parameters to the project’s technical objective.
Mobilization and Field Logistics
Geotech asks prospective customers for the area coordinates, line direction and spacing, local accommodations and deadlines. Its quotation material also discusses mobilization and standby. These inputs show why remote access and project timing belong in the initial brief, rather than being left until an aircraft is ready to deploy. Geotech quotation requirements.
Processing and Interpretation
A price for data collection can exclude work that another provider includes. Processing, quality control, interpretation and final reporting need their own scope. The useful comparison is the cost of obtaining the required deliverable, including the work remaining after the flight.
How Accurate Are Aerial Surveys?
Accuracy needs to be attached to a defined output. The position of an aircraft, the location of an image pixel and the quality of a final surface model are related measurements, but they are not interchangeable.
Airborne Sensing describes georeferencing, aerial triangulation and ground-control processes within its mapping workflow. Those steps connect image collection to the final spatial product. A customer’s acceptance criteria need to apply to that product, rather than simply repeating the specification of one instrument. Positioning and photogrammetric infrastructure.
Geophysical work presents a different question: whether the selected method and survey design can resolve the feature being investigated. A highly detailed dataset can still be poorly suited to the original problem if the wrong physical property was measured.
What to Include in an Airborne Survey Brief
A useful project brief gives competing suppliers the same basis for their proposals:
- The decision the survey must support and the project boundary.
- Required maps, models, measurements and interpretation.
- Acquisition parameters already established by the technical team.
- Schedule, local access and field-support constraints.
- Coordinate system, delivery formats and metadata requirements.
- Responsibilities for aircraft, sensors, processing and quality control.
- Acceptance criteria and the process for correcting deficient deliverables.
- Data ownership and permitted reuse.
This puts the competition around an outcome the customer can evaluate. It also leaves suppliers room to explain where a different method or operating plan would produce a more useful result.
Airborne Survey Services: Common Questions
Is an Aircraft Operator Also a Survey Company?
It can be, but the roles may be separate. An operator can supply aircraft and crew while another business provides sensors, processing and interpretation. The proposal defines which responsibilities are included.
Can Drone Surveys Replace Crewed-Aircraft Surveys?
They can meet some of the same requirements. The practical choice depends on the size of the project, sensor payload, endurance, terrain and operating permissions, along with the required data product.
Which Airborne Survey Method Is Best?
The appropriate method is the one that measures the information needed for the task. Geophysical exploration, image mapping and elevation modelling require different technical comparisons, even when the aircraft covering the area looks similar.