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Even with technological development, small formats have been introduced with a photogrammetry technology that offers numerous benefits. The digital imagery for the small-format camera, installed on the lightweight platform, such as Unmanaged Aerial Vehicles (UAV), currently can be extracted from digital maps. The geometry of the Georeferenced Digital Surface Model (DSM), obtained from UAVs, is a multiplex of factors such as flight configuration, camera performance, camera calibration, and SfM algorism. The overlap...

In this paper we present a case study regarding a desert dust intrusion over Central and Eastern Europe in 5th of April 2021, observed using a multi-wavelength Raman and depolarization LIDAR system operated in Cluj-Napoca, Romania. This type of system meets the requirements of the European Aerosol Research Lidar Network – EARLINET and is suitable to provide reliable data on optical parameters for aerosol characterization. While mineral aerosols are the second largest source of aerosol and are the subject of long r...

Urban areas are very dynamic environments, subject to continuous expansion and growing population, with land use changes influenced by the needs and dynamics of the population. Using remote sensing techniques applied to Sentinel-1 GRD images, some change detection patterns could be revealed for Bucharest city, for a period of three years (2016-2019). As the largest city in Romania, the main university center and the most important industrial and commercial center, Bucharest offers a wide range of educational, inve...

The focus of this study is detection of the deformations of the Earth's surface caused by March 3 2021 earthquake using Differential Interferometric Radar Synthetic Aperture technique. This method takes advantage of the remotely sensed SAR data provided at no cost by ESAs’ Sentinel-1 mission which are often used for creation of topographic maps as well as for detection of ground motions. The final results of this processing deliver reliable information about the displacements caused by the mentioned events with ce...

The presented paper deals with the issue of assessing the condition of winter wheat (Triticum aestivum L.) stand during its development in the spring period. The field experiment was established in 2020; two plots sized 25 ha and 16 ha were selected with a model plant of winter wheat. In the spring period (BBCH 35 and BBCH 51), both plots were monitored using an unmanned aerial vehicle (UAV) and Sentinel 2 satellites. After the end of the monitoring, spectral analysis of pictures taken was made and a basic NDVI ve...

Modern space complexes are designed to solve a wide range of tasks, including remote sensing of the Earth in order to assess the geoecological state of territories. The transmission of super-resolution images obtained as a result of sensing to ground-based control systems is traditionally carried out by space telecommunications systems, the requirements for technical characteristics and parameters of which in terms of the speed of information exchange and the reliability of communication are constantly being tight...

Flood events, as well as the channel and floodplain landforms are crucial for the transport and spatial distribution of heavy metals and metalloids in soils in the river valleys. The paper outlines the results of obtained preliminary indications about the flood proneness of two study areas located in the valleys of Ogosta River near the village of Gorna Kovachitsa and Lom River near the village of Vasilovtsi (NW Bulgaria) based on hydro-geomorphological indices. The detection of flood-prone areas has been done usi...

The intensive development of remote sensing and unmanned aerial vehicles, and the accessibility of small drones, provide excellent opportunities for shallow water bathymetric surveys on the northern Bulgarian Black Sea coast. The combination of erosional/abrasional and depositional natural coastal types allows testing and assessing the efficiency of aerial surveys for bathymetric mapping. The Bay of Chernomorets is an excellent opportunity to combine data from single-beam sonar, multi-beam sounding and shooting wi...

This article aims to present the process of obtaining the modern photogrammetric products such as orthophotomap, digital terrain model, regarding surface mining in open pit mining and quarries. The authors also want to present current technologies in photogrammetry, data processing using graphics stations and digital processing of data obtained by using UAV systems with a fully integrated RTK module that provides real-time centimetric position information to achieve very high accuracy of meta-information in images...

Precision management of the crop production, implemented in the precision farming system, implies a spatially differentiated, based on spectral measurements, implementation of agrotechnical measures provided for by the technology of their cultivation. The study of the spectral characteristics of spring wheat crops under changing agricultural conditions was carried out in a multi-factor micro field experiment at the Menkovskaya experimental station of the Agrophysical Research Institute (Russia, Leningrad Region). ...

The aim of the study is the evaluation of multispectral imaging by unmanned aerial vehicles (UAV) and free available satellite data (Sentinel — 2) for the diagnosis of the nutritional status of winter wheat. For this purpose, a field trial was established in 2020 (28 ha of winter wheat), both on the fields of farm enterprise ZD Kojcice (Pelhrimov, Czech Republic). The observation of the fields was performed in two vegetation phases important for the application of nitrogen fertilizers to cereals by topdressing (BB...

Over 30% of the Bulgarian Black Sea shoreline is characterized as a depositional type of coast. A significant portion of it represents well-formed sandy beaches and dune fields, falling under the protection of the European ecological network NATURA 2000. The coastal sector of the Lower Kamchia Depression hosts the longest beach-dune system on the Bulgarian Black Sea coast called Kamchia-Shkorpilovtsi beach. The main task of the project "Mapping and monitoring of depositional areas along the Northern Bulgarian Blac...

Assessment of the nutritional status of crop stand and other plant biophysical parameters can be a suitable source of information for the application of nitrogen fertilizers in precision agriculture, especially in conditions of high spatial heterogeneity of farm fields. Determination of the application rate of nitrogen fertilizers can be performed based on the plant diagnosis and estimation of plant biophysical parameters, such as nitrogen content, total amount of aboveground biomass and nitrogen uptake (Nupt), or...

Soil erosion is one of the most widely dispersed adverse geomorphological processes in a global scale. If it is not limited, it can change the topographic surface, reduce the slope stability and water retention capability, and thus increase the disposition for geomorphological hazards. Heavy rainfalls or intensive snowmelt are the main triggering factors for erosion, but the processes strongly depend on the topography, slope gradient, soil properties, vegetation cover and land use. The aim of the current research ...