Analysis of the accuracy of horizontals estimated by different mapping methods
Keywords: elevation errors, GIS, accuracy of horizontals, LIDAR, mapping, model, relief
AbstractThe objective of this research is to analyse the accuracy of horizontals which are formed by different mapping methods and to create an accuracy analysis model of surface elevation formed by different methods. The research was carried out in three stages: 1) Choosing the territory and collecting spatial data; 2) Data processing; 3) Analysis of data. The research object is the relief of some part of the Pypliai Village which is in the Kaunas District. In respect of the relief it is a varied place of different expressiveness situated by the Nemunas River. After the comparison of elevation data got by geodetic and analogical methods it was estimated that the total intersect area was 0.9581 ha (32% of all investigative territory). When comparing the elevation model made by the geodetic method and the LiDAR method, it was estimated that elevation intersected in 1.2762 ha of the territory (43% of all investigative territory). In comparison of the elevation data of all three methods it was measured that the area of intersection was 0.5926 ha (only 20% of all investigative territory). It can be confirmed that the data is accurate in this territory – it intersects in all three mapping methods. The LiDAR elevation data is more accurate than the analogical model data. Nevertheless, the utmost 10 meters error is considerable while comparing to the geodetic model data, it occurs 10 times of 74 cases of comparison.
Environmental Engineering and Landscape Management