## 1 Introduction
### Overview of Spatial Data Quality Aspects
At the national level in the conditions of the Slovak Republic the Spatial Data Registry ([[https://rpi.gov.sk/en](https://rpi.gov.sk/en)]([https://rpi.gov.sk/en](https://rpi.gov.sk/en))), operates, which contains the created Database of Spatial Data on Topography, also available through the map services of the National Geoportal ([[http://geoportal.gov.sk/sk/map](http://geoportal.gov.sk/sk/map)]([http://geoportal.gov.sk/sk/map](http://geoportal.gov.sk/sk/map))) Last but not least the Database on Flood Situation is available through the Slovak Water Management Company ([[https://mpompr.svp.sk/](https://mpompr.svp.sk/)]([https://mpompr.svp.sk/](https://mpompr.svp.sk/))) portal. Bearing in mind the complexity of the flood scenario modeling solution at the national level, there is a persistent lack of data with high resolution. This situation threatens the entire modeling process [39]. Flood modeling involving the collection of topographic data with high resolution currently depends on LiDAR technology [40; 41]. Figure 1: Basic elements and sub-elements of spatial data quality (based on the ISO19157:2013). Currently a comprehensive database of LiDAR data is not available for the territory of Slovakia. The main providers of LiDAR data include national authorities such as the National Forest Centre ([[http://www.nlcsk.org/](http://www.nlcsk.org/)]([http://www.nlcsk.org/](http://www.nlcsk.org/))) and the Geodetic and Cartographic Institute ([[http://www.gku.sk/gku/](http://www.gku.sk/gku/)]([http://www.gku.sk/gku/](http://www.gku.sk/gku/))) and also several commercial companies. For this reason, other available technological solutions are also applied for data collection (e.g., ground survey). Even though several innovative approaches to collecting topographical and hydrological data are available, some confusion and uncertainties exist which, according to [PERSON], et al. [38] have an influence on the quality of hydraulic/hydrodynamic analyses, and according to [PERSON] [40] and [PERSON] [42] also on hydrodynamic modeling, as well as on modeling the extent of flood inundation [43; 44]. The qualitative level of topographical parameters derived from Digital Terrain Model (DTM)/DEM and subsequently entered into hydrodynamic models results in the associated uncertainties of these models (DEM), as confirmed in the work of [PERSON] [45] and [PERSON] [46]. In connection with the examining of uncertainties in topographic data and their impact on the modeling of flood scenarios in built-up areas, is in work [PERSON] et al. [47] an important aspect of model selection and its parameters specific to the problem and input data. The current opportunities for water management practice available in spatial data collection for flood modeling are applied in our study for data collection using the Global Navigation Satellite System (GNSS) technology [48]. [PERSON] [40] further claims that the geometric description has a direct effect on the hydraulic model (cross-sections and the topography in the model through elevations). The current opportunities for water management practice available in spatial data collection for flood modeling are applied in our study for data collection using the GNSS technology. The above overview of information related to the flood scenario modeling process could not be fully implemented without the application of GIS. [PERSON] [45] shows that GIS significantly supports hydrodynamic modeling by presenting topographic features of the observed phenomenon. GIS is not only a flexible system for flood modeling, collecting different types of spatial and structured data, but also a supporting tool in various decision-making processes [49; 50]. This support is also evident in the observation of spatio-temporal changes in flood events [51]. The contribution by [PERSON], et al. [52] points out the possibility of creating false confidence from the results obtained from the modeling process as a result of the use of high-resolution data, especially among the non-expert public.