Laser scanning has gradually become a recognized method for digitizing 3D terrain. Terratec has extensive experience in the field and was the first player in Norway to start with the airborne carrier and later car-borne laser scanning.
The measurement is done by an advanced laser scanner sending out light waves which are reflected to the sensor. In advanced processing, returns are assembled into a 3-dimensional point cloud. The number of points per m² will vary from 1 up to over 100 points per m², depending on how high above the ground the aircraft fly.
The advantage of airborne laser scanning is that you can get very good documentation of the terrain even in areas with a lot of vegetation. This allows the method to calculate a terrain surface with substantially greater accuracy and reliability than with other techniques.
The point cloud is further processed by separating different objects such as terrain surface, vegetation, buildings, power lines etc.
A common product is a terrain model (DTM) that will be very valuable for designing new infrastructure such as roads, railways and power lines. This can also be used to calculate mass transfers and costs related to this between the client and the contractor. We also make surface models (DSM) that include vegetation, buildings and other objects that have great usefulness, for example, noise calculations and visibility analysis.
Next to the laser sensor is a digital camera which provides high resolution images. The images can be put together into an image mosaic (orthophoto), which is often a useful additional product.
Please contact us for more information on airborne laser scanning.