POSSIBILITIES OF APPLICATION OF DIGITAL RELIEF MODEL IN CADASTRAL SURVEYING OF LAND

Cadastral surveying of land is the determination, establishment, and survey of the legal boundaries of a land unit. Cadastral surveying of land is performed that it is necessary to divide a unit of land, merge land units or rearrange the boundaries, if it is necessary to update the situation or encumbrance plan. In the process of cadastral surveying of land, an area plan is prepared. Sometimes the terrain situation is complicated, and it is difficult for a surveyor to access the object. When the terrain situation is difficult, a digital terrain model can be used in the surveyor's work. The digital relief model is a set of points with a step between points of 20 meters. Each point has known plane coordinates (X, Y) and altitude (Z). The points cover the area in the form of a regular network. In Latvia the digital relief model is linked to the LKS-92 TM coordinate system, the normal height system LAS-2000.5 [1]. In the digital relief model, it is possible to see such elements of the situation as ditches, rivers, roads. The main result of research is, if the object is in a place with thick overgrowth, such as a forest, then the digital relief model has well-visible ditches or other elements of the situation, which greatly facilitates the surveyor's work. Thus, the surveyor can draw this ditch from the model, not many measurements are required, the surveyor's time is saved. Very often these types of objects are difficult to access. Digital relief model is a good helper in daily work.