Civil Engineering and Building Service Topographic Permanent Landmarks Network. Spatial Coordinate Optimization

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Sustainable development is a modern concept of adaptation conditions for achieving objectives that respond simultaneously to at least three major requirements: economic, social and environmental. Achieving sustainable development cannot be accomplished without a change of mentality of people and without communities able to use resources rationally and efficiently. For an efficient application programs surveying topography discipline the students have imagined and created a network of local topographic permanent terminals required for reporting the rectangular coordinates of applications. In order to obtain more accurate values of these coordinates we have made several types of measurements that will be presented in detail in this work.

The aim of this paper is to optimize the locating terminals coordinates of the points of our faculty, initially determined using GPS technology. Additional measurements were performed in an interval of one year using a total station. Considering that four previously determined terminal network points were placed between the relatively tall buildings, it was decided that it could be better to determine their spatial coordinates using the classical planimetric surveying method. To this end, the coordinates of the two reference points were located and determined near this network with the help of GPS technology in an area with good visibility. In order to determine the coordinates of the two reference points GNSS Permanent Stations National Network was used through the RTK method: RTCM (Radio Technical Commission for Maritime Services). The measurements were using GPS SOUTH S82T, whose field book has the implemented software transcomputation real-time geographic coordinates in STEREO-70 coordinate system. The network of permanent GNSS stations used the fixed station IASI_2.3 and the virtual station RO_MAC_3.1_GG. The solutions for the new determined points were fixed, the determination’s accuracy ranging between 0.034-0.010 meters. Following these two rounds of measurements of the locating terminals coordinates of the network points of the faculty using GPS technology combined with the classical planimetric surveying method, we got a new set of coordinates with a higher degree of determination accuracy after averaging the results.

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