Survey

e20-min

Terra Drone acquires aerial mapping data using a combination of drones and manned aerial platforms utilising various techniques such as, photogrammetry and LiDAR. 

With a team of qualified land surveyors and data processors, Terra Drone create accurate and high-resolution datasets. Every dataset produced is checked for consistency, resolution and accuracy. A quality control report is part of the standard deliverables.

Aerial surveys offer a great way of covering large areas of land, whilst maintaining high resolution and high-quality data. 

Terra Drone use the latest drone and camera technology to fly pre-programmed flights and capture high resolution still imagery. Further data is captured by ground teams to ensure that the data is tied into the correct coordinate system. Full survey verification is performed to provide confidence on the accuracy of the final deliverables. 

Terra Drone is specialised in aerial photography at low heights, with geometrically calibrated cameras. This enables Terra Drone to obtain all heights of a surveyed terrain.

The advantage of a digital terrain model is that it allows for extremely fast and efficient ground analysis. This enables the volume of a stockpile to be evaluated, relative to a ground level. Continual monitoring and ongoing analysis allows our teams to track stockpile movements and generate consistent volumes over time.

e21-min

Photogrammetry

e22-min

Photogrammetry is the science of combining multiple overlapping images to create a single overview image and 3D model of an area or object. TerraDrone use this technique by capturing overlapping imagery from cameras mounted on drones. The drone can be flown manually or pre-programmed to follow a defined route along which the camera takes images at defined points. This data is passed on to data processing teams in our offices who then process this data to produce single overview images and 3D models. By combining data with GPS control from the site the team can produce data with known levels of accuracy which are reported alongside the data delivery.

The output file formats from this process can be varied and offer clients a great deal of versatility and insight. Data can be viewed in almost any GIS or CAD software package.

LIDAR

Lidar is a surveying method that measures distance to a target by illuminating that target with a laser light and measuring the return signal. The difference between the time the pulse was sent and when the pulse was received is an indication of the distance of the target. The LiDAR sensor perform this task hundreds of thousands of times per second as the drone flies. The result is a high-density point cloud which provides a 3 dimensional representation of the area flown.

The subsequent LiDAR data can be further analysed to measure the intensity of each return signal from which our data analysts can use to classify the point cloud.

Morocco-DTM-3

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