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Multi-sensor technology for highly accurate survey results

For 3D Mobile Mapping Hansa Luftbild uses vehicles equipped with multi-sensors. The combination of stereo images, a panorama camera and laser scanner enables the delivery of highly accurate survey results which have multiple applications and uses.

Foto eines infra 3D-Fahrzeugs

Mobile survey methods allow roads and other infrastructure to be captured accurately and visualised. The infra-3D technology used by Hansa Luftbild delivers highly accurate data and user friendly applications. Whether the depth of a pothole, height of an entranceway or texture of a facade needs to be surveyed and measured - an operator can use the precise 3D results displayed on-screen, in the office, to perform supplementary measurements and to plan operations.

The multi-sensor technology on board the survey vehicle ensures the accuracy of the data. “Three different types of survey systems always run in parallel,” state Dirk Namsler who operates Hansa Luftbild’s survey vehicle. There are several digital camera pairs for stereoscopic imaging, which deliver highly accurate measurements of the road surface or for street inventory. At the same time the six lenses of the digital panorama camera captures a 360 degree view. In addition, a 360° laser scanner mounted on the rear of the vehicle scans the survey area collecting 3D measurement data about the road surface and the upper part of the 360° field of view.

The stereo-cameras captures imagery consisting of approximately 100 megapixels every 2 metres and thus generate very accurate high density 3D images. One pixel delivers a 5 millimetre edge length at a distance of 10 metres. “There are 2,600 points on an A4-sized image,” states Namsler. The systems are geo-referenced using GPS and are calibrated for an accuracy of less than one millimetre. This means that the infra-3D system can generate an exact xyz-value for every pixel.

During operation the laser scanner continually scans the area to be surveyed and delivers a dense 3D point cloud with measurement data. So it can be ascertained, for example, from the digital photos the position and properties of ruts in the road, and the laser data can give precise information about their depth. According to Namsler, “Whether ruts, cracks in the road, or potholes - such data can be passed on to a wide variety of applications.” The 360° laser scanner can also capture parts of buildings or tree parameters.

Hansa Luftbild’s central focus for its clients is on the user-friendly performance of the survey data. All images, laser scanning and vector data are combined in one software platform and can be made optionally available through a cloud service. Users can access the data for needed for their specific requirements in a web-based browser of their choice. Cross-sections, routes and areas can be measured on-screen from the image. A perpendicular can even be dropped from a streetlight head without a problem.

“The precision of the measurements makes the difference,” states Hansa Luftbild’s Dr Ralf Andreas Sembritzki.  The process ensures that during a survey run the GNSS-signals are captured without interruption as long as the vehicle does exceed a speed of 60km/h. The absolute measurement accuracy in accordance with SAPOS (Satellite Positioning Service of the German State Survey) correction data in position and height is 5 to 20 centimetres. With the incorporation of additional control points, for example height data from municipal manhole covers, absolute accuracy can be increased to 1 to 2 centimetres.

The flexibility of the system can be seen in a project currently being undertaken for the city of Munich’s parks and gardens department. On the basis of data collected from a mobile survey Hansa Luftbild can extract relevant information about trees located on city grounds. “We capture the exact position, height and diameter of the trees and update the tree cadastre,” states Sembritzki. The stereoscopic imagery delivers the exact diameter of the tree, the laser scanner the height and the panoramic images allows the tree to be viewed from different angles and views.

With the assistance of the mobile survey data Munich is developing a digital twin, for which highly precise base data are needed. With such data structural engineers can calculate highly accurate supplementary measurements on-screen and plan projects without the necessity for going out into the field.  The advantages are obvious: the greater the accuracy of the base data, the more universal will be its applications and the better the value for your investment. 

Further information is available here.

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