High industrial chimney inclination monitoring and analysis is crucial from a stability point of view because, if not maintained, it can pose a great potential hazard for its surroundings. Various modern approaches of chimneys’ geometrical parameters determination have been proposed and are actively in use. However, little research regarding the applicability of the unmanned aerial system (UAS)-based photogrammetric approach of chimney structural monitoring has been conducted and a comprehensive analysis with validated methods is lacking. Therefore, this research is focused on the determination of geometrical structural parameters of a masonry chimney whereby two independent methods have been applied. Reference values of the chimney geometrical parameters have been determined by precise total station (TS) measurements and, in relation to them, the applicability of the UAS-based photogrammetric approach is evaluated. Methodologically, the reference and validation values of the chimney geometrical parameters have been determined based on double modeling of the chimney structure. Firstly, cross-sectional elliptical regression has been applied to determine the geometrical values of the chimney at predefined above-ground levels (AGLs). Secondly, the spatial chimney axis has been derived by polynomial regression to determine the inclination of the full chimney structure. Lastly, the structural stability of the chimney is validated based on its axis inclination whereby permitted deviations are determined according to the European Standard EN 1996-1-1:2005. Experimental results of our research show that consistently better results are gained by TS-based surveys and, although the determination of the chimney’s geometrical values by the UAS-based approach is certainly possible, great attention must be given to the accuracy of the UAS-generated point cloud (PC) if high accuracy results are needed.
In the last several years, the application of Unmanned Aerial Vehicles (UAV) undoubtedly has an ever-growing trend. What was previously limited to military use only, today is increasingly turning to civilian use. This paper analyses the possibility of using unmanned aerial systems in cadastral surveys. For that purpose, a survey has been conducted on a test field near the city of Novi Marof in the Republic of Croatia. Selected parcels were measured both with the GNSS RTK method, utilizing a receiver Stonex S9IIIN Plus and with a Topcon Falcon 8 UAV. The basis for the analysis and result interpretation represented the parcel boundaries break point coordinates obtained by the GNSS RTK measurements and the coordinates obtained from the Digital OrthoPhoto map (DOP) generated from UAV data. Furthermore, the analysis of the computed parcel areas was performed.
The significance of geodetic deformation monitoring during the construction of any type of civil engineering structure is a well-known matter. Many classical and sophisticated geodetic monitoring methods employing total station, GNSS, laser scanning, photogrammetric and other technologies have been developed and are actively in use. Nevertheless, precise geometric levelling is still one of the most accurate of all geodetic measurement methods. This paper presents a practical example of deformation analysis being applied to a monitoring levelling network established for the determination of vertical displacements of a residential building in Zagreb in the Republic of Croatia. Before the construction start, the stability of the monitoring network has been analyzed in two measurement epochs and vertical displacements of the network's benchmarks have been determined by applying the Karlsruhe deformation analysis method. All relevant results are presented.
Official cadastral maps of the Republic of Croatia were made in different historical time periods utilizing different surveying methods, under changing social and political structures and under rapid technological growth. It is estimated that 75% of all cadastral maps in Croatia are still based upon the 19th century graphic survey. Homogenization of Digital Cadastral Maps (DCMs) is one method of spatial accuracy improvement of existing maps without the need for new comprehensive cadastral surveys. Under the supervision of the State Geodetic Administration (SGA) of the Republic of Croatia, methodology and technical solutions for the homogenization of DCMs were developed. In this paper homogenization of the DCM of cadastral municipality Plomin in Croatia is presented.
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