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The validity of the results obtained within different permanent GNSS reference station networks (GNSS Network) must be periodically controlled using criteria that are generally known from statistical analyzes or prescribed by International Standards. Procedures for evaluating the uncertainty of measurements are defined in accordance with the purpose of the GNSS Network. The authors of this paper want to point out the need to establish requirements for periodical and systematical control of GNSS coordinates within the same permanent GNSS Network and control of GNSS coordinates between different permanent GNSS Networks measured on the same/unique point on the ground. This paper presents control procedures for three permanent GNSS reference station Networks established and operating in the Republic of Serbia. Special attention is on the analysis of data consistency within one permanent GNSS Network and the mutual consistency of GNSS data between different networks. The paper aims to promote reliance on the different GNSS Networks and contains suggestions on how GNSS Networks may prove that they are performing competently and that they can provide valid results for field measurements. Particularly highlighted is the need to plan and implement measures related to increasing the effectiveness of the GNSS system, achieving improved results, and preventing negative effects while performing field measurements. The paper presents the results for comparison, selected according to the rules for creating a Digital Cadastral Map features, i.e., points, lines, and polygon. The results for comparing point features are the GNSS coordinates. The results for comparing line features are the lengths of the line, i.e., distances, and the results for comparing polygon features are the areas of the polygons.

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Water is the greatest natural treasure of Serbia. However, this natural treasure is not only for the benefit of the citizens, but it has caused and continues to cause the greatest natural disasters with significant material damage in the country. This paper deals with the methodology of using an unmanned aerial vehicle with an integrated RTK GNSS module, for the purpose of field surveilance by Unmanned Aerial Vehicle (UAV) photogrammetry. Gradually and in detail, the procedures are explained, as well as the use of programs for processing Pix4D, Global Mapper and creating 3D terrain models. A control and presentation of obtained resuls is performed. Based on digital elevation models, for the research area, a flood zone simulation for different levels of the Tisa River is presented.

On the territory of the former Yugoslavia, the issue of property relations has often changed. In the post-World War II period, private property was taken away by various economic and political measures, and transformed into a social one. In this way, the parcels were taken from the rich layers of society, distributed to the poor, but also significantly fragmented in a way that limited the agricultural benefit. Later, former owners of taken property sought compensation, where the term restitution appeared for the first time, as a process of returning the taken property. In Serbia, in 2011, as the last country in the region, the supreme law regulating restitution-The Law on Restitution of Taken Property and Compensation was carried. The research subject of this paper is the restitution and the manner of registration of the legal consequences in public books, using examples of restitution of construction аnd nonconstruction areas.