On the Accuracy of Cadastral Marks: Statistical Analyses to Assess the Congruence among GNSS-Based Positioning and Official Maps

Cadastral marks constitute a dense source of information for topographical surveys required to update cadastral maps. Historically, in Italy, have been the cartographic network implementation mapping updates. Different sources can be used by surveyors. In recent years, cadastre is moving toward digital world, and with advancement surveying technology, GNSS CORS technology has emerged positioning marks. An analysis congruence among using official maps missing. Thus, this work aims analyze positional accuracy some marks, located Palermo, regard produced bureau, local cartography, Google Earth A survey 60 was carried out conventional NRTK procedures, lateral offset method due their materialization (mostly building edges), which not always directly detectable. The marks’ obtained from different maps: related monographic files, numerical technical maps, check coordinate congruence. statistical approach performed whether distribution frequencies coordinate’s differences belonged bivariate normal planimetric coordinates univariate altimetric component. results show that hypothesis confirmed most pairs, specifically, analyses indicate highest congruencies seem characterize determined those deduced experimentally centimetric accuracies survey, both components, while georeferencing order 0.4–0.8 m. Meanwhile, resulting comparing cartography authority greater criticalities, metric magnitude.