| Abstract [eng] |
Recently, the three-dimensional geographical information about the earth's surface is being collected by effectively applicable area scanning (probing) with aerial laser method LIDAR (Light Detection and Ranging). Scanning derives irregular very dense three-dimensional ground dot object that simulates geometric layout information. This information has extremely wide adaption range for applications - terrain analysis (e.g.: gradients, slope exposure) geomorphological surveys, hydrological measurements and topographical data acquisition, as well as, new buildings modeling, updating and maintaining cadastral data, tree register, etc. Regardless of the use of spatial data that was obtained by the laser scanning in three dimensions, in the field or the submission the geometric objects simulating the earth's surface are too large for simple display. For this reason, not all of the map objects are shown but just a selection of objects or events. The following objects are dependent on cartographic generalisation. Currently one of the main parts of the map in geographic information systems is mapping the terrain. On the other hand, creation process of the terrain isolines isn't as simple as they appear. In order to create isolines, ArcGIS software tools complexity causes the most problems. Another problem is that nowadays it is not difficult to collect accurate and quality data such as LIDAR dot cloud, but this data must be processed with powerful computer equipment. |
