Analysis of the condition of the Agila dune is presented in this Article. The analysis is based on data collected during accurate geodetic measurements using LIDAR technology. The current state of the Agila dune was compared to the data of the previous year's LIDAR points in order to ensure the reliability and value of the research. In the course of the study, eleven cross sections were compared by height differences with previous year‘s measurements. The condition of the Agila dune was found to be the worst in three cross sections. First cross section‘s erosion measured at 13,98 meters, erosion in the fifth cross section – 9.90 meters, and erosion in the eighth cross section - 11.34 meters. The main reasons for the deterioration of the natural values of the Kursiu Nerija National Park are climate, wind, high visitor flows and the persistent failure to carry out comprehensive research. Therefore, in order to preserve these unique natural values, it is important to collect large-scale and high-precision data on the status of these values, to systematize, analyze and take appropriate protective measures.
Recently, cartographic products obtained by the use of photogrammetric methods have been increasingly applied in digital public spaces. The aim of the research was to analyse the properties of photographic images in relation to the developed technical specification for aerial photography project realization to obtain the most efficient, accurate, and high quality aerial cartographic products. Based on photogrammetric data from two aerial photography projects, where the terrain was aerial photographed from different types of unmanned aerial vehicles (TRIMBLE UX5, DJI MATRICE 600 PRO) and cameras (Zenmuse X5, Nex-5T), the properties of the photographic images were analysed, and their correlation with the accuracy requirements for the aerial mapping processes is presented. In order to fulfil accuracy requirements for terrain mapping by the use of UAV-photogrammetry technology, a ground sample distance (GSD) of 5-20 cm is recommended when aerial photography mission is executed from a low-flying vehicle.
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