Wall traverse with GPSSIT and 3D positioning of urban details

Abstract

In an urban environment, sometimes surveying becomes a very hard task, especially measuring some certain points or details on the ground that are surrounded by obstacles such as trees, fences or buildings. On the other hand, in such areas, survey points installed as references on the ground can easily be lost because of city activities. Wall traverse supported by GPSSIT (GPS Sanal Istasyon Teknigi - GPS Virtual Point Technique) and relying on freely chosen Sanal Istasyon Noktalari (SINs) or - virtual points (VIPs) without worrying about installing any control point on the ground provide a reliable resolution. In this study, establishment of wall traverse points by the support of GPSSIT and TS (GPSSIT and total station) and a detail measurement technique with 3D coordinates using these wall points were introduced and applied in a sample area. As a conclusion, standard deviations were found as m(p) = +/- 4.53 cm and m(H) = +/- 3.85 cm in position and height respectively for details.