During the last years, in many developed countries, administrations and private companies have devoted considerable amounts\r\nof money to obtain mapping data using airborne LiDAR. For many civil activities, we can take advantage of it, since those data\r\nare available with no cost. Some important questions arise: Are those data good enough to be used for determining the heights\r\nof the civil constructions with the accuracy we need in some civil work? What accuracy can we expect when using low-density\r\nLiDAR data (0.5 pts/m2)? In order to answer those questions, we have developed a speci??c methodology based on establishing a\r\nset of control points on the top of several constructions and calculating the elevation of each one using postprocessing GPS. ?ose\r\nresults have been taken as correct values and the comparison between those values and the elevations obtained, assigning values\r\nto the control points by the interpolation of the LiDAR dataset, has been carried out. ?is paper shows the results obtained using\r\nlow-density airborne LiDAR data and the accuracy obtained. Results have shown that LiDAR can be accurate enough (10ââ?¬â??25 cm)\r\nto determine the height of civil constructions and apply those data in many civil engineering activities.
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