By John Steventon
The growing to be marketplace penetration of web mapping, satellite tv for pc imaging and private navigation has unfolded nice study and enterprise possibilities to geospatial groups. Multi-platform and multi-sensor built-in mapping expertise has basically verified a pattern in the direction of quickly geospatial info acquisition. Sensors may be fastened on quite a few structures, reminiscent of satellites, aircrafts or helicopters, terrestrial cars, water-based vessels, and will also be hand-carried by way of contributors. cellular mapping refers to a method of accumulating geospatial info utilizing mapping sensors fastened on a cellular platform. Its improvement used to be basically 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 reasonably cheap and conveyable sensors, cellular mapping has develop into extra dynamic, or even pervasive. The ebook addresses a large choice of analysis matters within the cellular mapping neighborhood, starting from approach improvement to sensor integration, imaging algorithms and cellular GIS functions. This booklet will supply researchers and practitioners an excellent total view of what's being built during this topical quarter.
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28 Figure 13. 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.
Post-mission processing, when compared to real-time filtering, has the advantage that data of the whole mission can be used to estimate the trajectory. This is not possible when filtering is used, because only part of the data is available at each trajectory point, except the last. When filtering has been used in a first step, one of the optimal smoothing methods, such as the Rauch et al. (1965) algorithm can be applied. It uses the filtered results and their covariances as a first approximation.
E. ), identifiable both on the ground and on the frames, have been selected on the road (Fig. 10). A topographic survey has been then performed, using a Nikon DTM 851 Total Station. Semidiameters of the error ellipses are about 1 cm, corresponding to 1 pixel on the rectified frames. On the georeferenced mosaic, the coordinates of the control points have been measured, and the differences respect to the coordinates obtained by the Total Station surveying have been evaluated. In Figure 11, the arrows indicate the direction and the value of position differences for the road of Figure 8 (the deviation vector scale is arbitrary).