Aerial Survey & LiDAR
Aerial Survey & LiDAR
AAM began performing aerial surveys over 50 years ago, using film cameras and slide rules. Today we have GPS-equipped planes, digital cameras and powerful computers, allowing us to perform rapid surveys over large land areas with accuracy down to 5cm and deliver your data quickly.
We have expanded to a fleet of 14 aerial survey aircraft operating throughout Oceania and South East Asia, equipped with a range of digital aerial cameras and airborne LiDAR systems. Our airborne operations team can respond rapidly to your project, where ever the location.
Whether you're a local government authority requiring up-to-date, high-resolution aerial imagery for your corporate GIS, or a civil engineering firm requiring accurate terrain information for a major infrastructure project, AAM has the resources, experience and expertise to ensure we deliver you a cost-effective, fit-for-purpose solution.
Aerial Imagery & Aerial Photogrammetry
Aerial imagery provides a record of the earth's surface at an instant in time and is relied on by all organisations that manage or interact with the natural and built environments. Aerial imagery provides a common language to help communicate complex concepts or problems to developers, planners, decision makers and society at large.
Aerial photogrammetry is a method of surveying involving the measurement and interpretation of features directly from aerial photographs. Aerial photogrammetry complements aerial imagery and airborne LiDAR derived datasets.
Some applications of aerial imagery include:
- Governments use aerial imagery to help monitor and manage environmental change
- Local governments use aerial imagery to improve town planning
- Mining companies use aerial imagery to help quantify and manage disturbance and rehabilitation
- Engineers rely on aerial imagery to help determine optimal route location and design for major infrastructure projects
- Emergency services rely on rapid-response aerial imagery to help assess damage caused by natural disasters and plan future mitigation strategies.
Some applications of aerial photogrammetry include:
- Topographic mapping
- Precise mapping of building outlines and roof structures to create 3-dimensional city models
- Volumetric determination of stockpiles and mine voids
- Preparation of Land Use maps
AAM operate a range of digital camera systems capable of yielding image resolutions from 5cm to 50cm, ensuring your imagery is fit-for-purpose.
High resolution digital aerial cameras coupled to airborne LiDAR systems allow imagery to be captured with LiDAR simultaneously, minimising aerial survey project cost.
Several of AAM's digital aerial cameras allow the infrared spectrum to be captured in addition to conventional visible light, benefiting applications for environmental, agricultural and forestry purposes.
Contact AAM to learn how aerial imagery and aerial photogrammetry can help your organisation or project.
Airborne LiDAR (Light Detection And Ranging) involves mounting a laser scanner in an aircraft that measures the height of discrete points in the landscape below the aircraft. This technology can capture hundreds of square kilometres in a single day. By measuring 10-80 points per square metre a detailed digital model of the landscape can be created. The accuracy of the point measurements allows the models created to be used in any planning, design, and decision making processes.
LiDAR can also pierce dense canopy, making it able to capture bare earth structure that satellites cannot see, as well as ground cover in enough detail to allow vegetation categorisation and change monitoring.
The resolution and positional accuracy of LiDAR means it can be used to capture and measure above-ground features over large areas including power lines, building outlines and towers.
We introduced LiDAR technology to our clients back in 1998, and continue to lead the field with state-of-the-art sensors deployed with professional expertise and experience.
More about LiDAR
Airborne LiDAR consists of a high frequency laser scanner that records the time differential between the emission of the laser pulses and the reception of the reflected signal from the environment. By combining this data with the position and orientation of the scanner (determined by differential kinematic GPS and an Inertial Measurement Unit) LiDAR creates highly accurate and detailed models of the earth's surface with a height accuracy down to +/- 10cm.
LiDAR scanners can also be mounted on ground vehicles and on tripods for traditional ground survey style usage. They can also be used to capture as-built constructions, including building interiors and exteriors, pits and stockpiles. The platform used depends on the scale of the project and the nature of the site.
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Bathymetric LiDAR measures the depth of water using airborne lasers scanning across the line of flight creating a swathe effect.
The laser beam is made up of 2 transmitted wavelengths; one infrared at 1064nm which detects the sea surface and any land, and one green at 532 nm which penetrates the water and is reflected back from the seabed. The time lapse between the returns from the two wavelengths provides the basis on which the depth can be calculated.
Full waveform data can be analysed to give indications of water quality, the nature of the seabed, and areas of underwater vegetation.
Bathymetric Hydrographic LiDAR allows rapid coverage of large areas. Although it is constrained by water clarity and generally limited to depths of less than 50m, it offers a cost effective solution to wide area surveys which are impossible, difficult or expensive to access or complete using conventional acoustic systems.