## 2 Materials and Methods
### Digital Relief Model Specification
_Integrity_--comparison of the set of surveyed points (the result of the local survey) with the third-generation digital model--DMR 3.5 with a resolution 10 m. Requirements for maintaining the representation of objects have been met. The legislation is not specified. 2. _Logical continuity/consistency_--creation of the descriptive database, in which the connection between the geometry and descriptive component of each geo-object was maintained. The legislation is not specified. 3. _Positional accuracy_--is considered one of the most important indicators of spatial data quality. The ISO 19157:2013 standard defines the absolute and relative accuracy of spatial data. Absolute positional accuracy is the mean value of positional uncertainty defined as the distance between a measured position and what is considered to be the corresponding true position [59]. This may be assessed in terms of each dimension individually or also in combinations. It represents the evaluated absolute horizontal/vertical error in spatial data. For the process of quality evaluation of DMR, the absolute vertical error is one of the most important characteristics. The evaluation of the vertical component of position error is performed according to the following formula for mean absolute error (MAE) Equation (2), standard deviation (SD) Equation (3), and mean error (ME): Equation (4). Through application of the referred procedure, the vertical component of position error was calculated for a certainty interval of 90%: Equation (5). \[d_{z}=\frac{\sum_{i=1}^{n}\lvert\varepsilon_{DMRi}-z_{Si}\rvert}{n} \tag{2}\]where:  
\(d_{z}\)**--mean absolute error [m],  
\(Z_{DMRI}\)**--value of height of the point in DMR,  
\(Z_{Si}\)**--value of height in the point control measurement,  
\(n\)**--number of terrain points  
\[\delta_{z}=\sqrt{\frac{1}{n-1}\sum_{i=1}^{n}(z_{DMRI}-z_{Si})^{2}} \tag{3}\]  
where:  
\(\delta_{z}\)**--standard deviation [m]  
\[\hat{\mu}_{z}=\frac{\sum_{i=1}^{n}\Delta z_{i}}{n} \tag{4}\]  
where:  
\(\hat{\mu}_{z}\)**--mean error [m]  
\[z_{t}\pm Q,\text{ where }Q=1645\delta_{z} \tag{5}\]  
The calculation of the relative vertical errors is not in this study applicate. _Temporal accuracy_--the temporal aspect reflects the realization of the local survey regarding the creation and updating the Fundamental Base of Geographic Data. The territory concerned lies within the area where data collection was implemented in 2008-2010, as the last stage of the local survey of the whole territory of Slovakia. The older the creation of the database, the greater should be the importance of its update. In terms of the actual time information, this condition was satisfied. _Thematic accuracy_--objects were not completely cataloged according to the catalog of object classes in the Fundamental Base of Geographic Data and catalog of the landscape, the ecological basis for integrated land management. The next level of assessment was based on the results from the needs of DMR quality and classic surveying (GNSS-RTK) assessment supplemented with other additional quality assessments of spatial information (legislative aspects, recommendations of water management practice), which regulate the qualitative aspect of parameters of hydrodynamic modeling. More detailed of assessment approach of suitability for use geomatics methods for hydraulic analysis is introduced in [PERSON], et al. [60].