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Novo Mesto, Slovenia

Petrovic D.,UL FGG
Geodetski Vestnik | Year: 2011

The most realistic way to represent the topography of the Earth is by using a globe; this fact was known as early as in ancient Greece. The biggest contribution to the making of these reduced models of our planet was made by Gerardus Mercator, who split the surface of the globe into zones in the 16th century. This gave rise to a revolution in the development of cartography, which also sparked the beginning of the mass production of globes. The principle for the production of this instrument has remained the same to this day; the only difference is that the major part of the process is now automated. However, globes of individual countries are still quite unusual and rare; this is why we decided to take on the project of designing the globe of Slovenia, which was performed within the Cartography III study course at the Faculty of Civil and Geodetic Engineering. The making of the globe of Slovenia includes the production of a general map of the country at the scale of 1: 1,000,000, the projection of a flat map on the globe and the pasting of printed zones on the supporting medium, in our case a table lamp. Source

Koler B.,UL FGG Oddelek za geodezijo | Urbancic T.,UL FGG Oddelek za geodezijo | Vidmar A.,UL FGG | Globevnik L.,Institute za vode Republike Slovenije
Geodetski Vestnik | Year: 2012

After the floods that hit Slovenia in September 2010, the Institute for Water of the Republic of Slovenia measured the heights of geodetic points (with the GNSS levelling method) used to determine the height of flood water on the Ljubljana moor and Ljubljana. The heights of these points were controlled by trigonometric levelling with connections to the benchmarks of the city levelling network of Ljubljana. An analysis of the accuracy of determining the heights of the points and the differences between the heights of the points, which were determined by GNSS and trigonometric levelling, are presented. Source

Ceh M.,UL FGG | Smole D.,DFG Consulting | Podobnikar T.,Institute of anthropological and spatial studies
Geodetski Vestnik | Year: 2012

Spatial data sources, like the geodetic reference system, administrative spatial units, addresses and topographic maps, serve as a base for geo-referencing to the most of dependant thematic spatial databases. The marketing strategy of the surveying profession towards the users of spatial data infrastructure should be in the design of an integrative semantic reference system to be used within the Semantic Web, or so-called Web 3.0. The main motivation for our research was the representation of possibilities to automate tool development for efficient and more sensible approaches to query information within web-published spatial data. In contemporary research there are several solutions offered as upgrades of basic GIS systems with the knowledge presented in the form of ontologies. Therefore, we are faced with the new generation of GIS technology, which has been named "inteligent GIS". In this article, we present method of modelling the semantic reference system as an application of the ontology of geographic space in the subset of first order predicate calculus. Such a semantic network of geographic space represents the foundation for semantic data analyses and data integration in distributed information systems. Our application is based on the methods of machine learning and use of the Prolog programming language. Source

Cekada M.T.,Geodetski Institute Slovenije | Crosilla F.,University of Udine | Fras M.K.,UL FGG
Geodetski Vestnik | Year: 2010

When ordering LiDAR data, LiDAR point density per surface unit is important information with decisive influence on the price of the LiDAR survey. Thepaper first deals with the theoretical calculation of the minimum LiDAR point density, necessary for the acquisition of topographic data of the largest scales. For this purpose the sampling theorem is used. However, since topographic objects (roads, water bodies, etc.) and phenomena represented on topographic maps and in topographic bases are in many cases located under vegetation, also the rate of laser beam penetration through vegetation for the area where the topographic data are to be gathered has to be known. In a research on a test case conducted in the area of the town Nova Gorica we calculated the rate of laser beam penetration for four different vegetation types: scarce Mediterranean vegetation, thick thermophilic deciduous forest, mixed vegetation (meadows, orchards and forest) and built-up area. By connecting the theoretic minimum LiDAR point density with the rate of penetration, we defined the minimum LiDAR point density for the needs of data acquisition on topographic maps of the largest scales or in topographic bases of comparable detail (from 1: 1000 to 1: 10,000). Source

Kuhar M.,UL FGG | Berk S.,Geodetski Institute Slovenije | Koler B.,UL FGG | Medved K.,Geodetska uprava RS | And 2 more authors.
Geodetski Vestnik | Year: 2011

This paper presents a quality analysis and comparison of two height reference surfaces. The first is the actual geoid model from the year 2000, and the second is the test geoid model determined in the frame of the project Establishment of the European Reference System in Slovenia. Quality analysis is based on the comparison of geoid heights determined from measured ellipsoidal and mean-sea-level heights and geoid heights interpolated from the model. A comparison was made on 352 GNSS/levelling points. Source

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