Flood hazard and risk analysis in developing countries is a difficult task due to the absence or scarce availability of flow data digital elevation models (DEMs) with necessary quality. Up eight DEMs (ALOS Palsar, Aster GDEM, Bare Earth DEM, SRTM Merit TanDEM-X NASA Copernicus DEM) different acquisition, spatial resolution, processing were used reconstruct January 2015 flood event. The systemat...

Fractional tree cover (Fcover) is an important biophysical variable for measuring forest degradation and characterizing land cover. Recently, atmospherically corrected Landsat data have become available, providing opportunities for high-resolution mapping of forest attributes at global-scale. However, topographic correction is a pre-processing step that remains to be addressed. While several me...

An approach to generate river cross-sections from the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM) is discussed. The low resolution and the inadequate vertical accuracy of such global data present difficulties in differentiating features of hydraulic importance, which necessitate pre-processing of the DEMs before they are used. A ver...

The main aim of this research was to improve risk mapping of heavy metals by taking account of erosion effects. A new spatiotemporal index, namely the G2met index, is introduced, with integration of pre-existing methodologies (Hakanson, EPM, and G2). The G2met index is depicted as a series of risk maps for each heavy metal on a month-time step. The southern part of Cyprus Island was selected as...

The article analyzes changes in steppe agricultural landscapes the central part of Azov-Kuban Plain over period 2000–2020 using satellite imagery and DEM ASTER GDEM data. terms changing structure land use hydrographic characteristics. Most Krasnodar territory, occupying 61.4 % region’s is located on plain river basins. territory under consideration with an area 6268 km², covering basins Chelbas...

Recent Digital Surface, Elevation, and Bathymetric Models (DSM/DEM/DBM) aim to provide high-resolution accurate height depth information needed for a variety of surveying, geodetic, geophysical, other applications. In this study, first we validate in two test areas some the most used models, i.e., ASTER GDEM; AW3D30 DSM; Copernicus DEM; EU-DEM; GEBCO 2020; NASADEM HGT; SRTM15+ SRTM Global, usin...

The negative U wave has been studied in 200 electrocardiograms. Six different types of negativity of the U wave are recognized; a seventh type includes the alterations of the T-U segment. Electro-cardiographic and clinical data are correlated with these changes. Two hypotheses to explain the vairing morphology of the negative U wave are discussed. U NTIL quite recently neither the genesis of th...