ИСТИНА

Nowadays the number of victims of natural hazards and their influence on technological systems unfortunately doesn’t decrease. The GIS analysis plays a big role nowadays in natural hazard management and it can be wildly used in different researches of natural hazard impact. But for GIS analysis the data should be georefernced. The mapping in large scale can be done easily. But speaking about medium and small scales we always face the problem of precision. We have to place exact geographic coordinates of each natural disaster if we want to conduct an investigation based on space distribution of natural disasters. But in small and medium scales the “dot” or “point” is conventional – so it doesn’t show the exact place where disaster happened, but shows an area. In urban territories the number of natural disasters is bigger than in uninhabited areas. So there will be the concentration of “dots” of disasters and the overlapping is inevitable. That is a real mapping problem not only because of deformed visualization, but also for different possibilities of GIS analyses. For different kinds of linear objects (such as pipes, roads etc) and for other conventional objects, which can be affected by the natural disaster it is very important to be in the mapping area of natural disaster. There are some different ways of solving that kind of situations – for example, the different kinds of natural disaster can be shown in different ways depending on their graveness, but in general the strict rules of georeferencing of natural disasters in medium and small scales should be invented depending on the nature phenomena, the influence on area and the user of the map.