Download Advances in Mobile Mapping Technology by John Steventon PDF

By John Steventon

The turning out to be marketplace penetration of web mapping, satellite tv for pc imaging and private navigation has spread out nice learn and company possibilities to geospatial groups. Multi-platform and multi-sensor built-in mapping expertise has truly confirmed a development in the direction of quick geospatial info acquisition. Sensors will be fastened on numerous systems, equivalent to satellites, aircrafts or helicopters, terrestrial cars, water-based vessels, and should also be hand-carried by way of participants. cellular mapping refers to a method of amassing geospatial information utilizing mapping sensors fixed on a cellular platform. Its improvement was once essentially pushed by way of the advances in electronic imaging and direct-georeferencing applied sciences. With the escalating use of telecommunication networks and the expanding availability of inexpensive and conveyable sensors, cellular mapping has develop into extra dynamic, or even pervasive. The booklet addresses a wide selection of study matters within the cellular mapping group, starting from method improvement to sensor integration, imaging algorithms and cellular GIS functions. This ebook will supply researchers and practitioners a superb total view of what's being built during this topical zone.

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Intensity image of a dynamic laser scanning. 5 CONCLUSION Within the framework of the GEOVAN project, the ICC has integrated all the required hardware and software subsystems in order to obtain an oriented platform mounted on a van. The oriented platform allows the dynamic georeferencing of any sensor rigidly mounted on it. At a first stage, two digital cameras have been integrated with the purpose of obtaining stereoscopic models of images. The accuracies obtained in surveyed points observed in the images with good GPS coverage are 3–5 cm in the direction perpendicular to the vehicle and 13 cm in the direction of the vehicle.

However, the main drawbacks for terrestrial navigation are the presence of obstacles on the road, like bridges or tunnels, which totally or partially interrupt the acquisition of GPS observations during a time interval, and the existence of areas where most of the GPS satellite signals are blocked by terrain conditions, such as urban areas with high buildings, forest zones, etc. In these areas without GPS coverage or with a very poor constellation, position and velocity are calculated from IMU observations, whose errors, with the help of the observations provided by the DMI, do not grow according to the duration of the GPS signal outage, but depend on the distance traveled.

The absolute accuracies of the Backpack DMMS in a variety of configurations are shown Table 4. From the tables, it can be seen that with as few 14 Table 3. Accuracy of the iMAR®iNAV-RQH INS system in stand-alone mode. 30 Straight line Circle Curve Static Static Straight line Table 4. Backpack MMS system absolute accuracy (20 m camera-to-object distance). 11 as five image point measurements at a 20 m camera-to-object distance it is possible to achieve accuracies that satisfy many mapping applications, for more details see ibid.

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