An Evaluation of Lidar, EU-DEM and SRTM-Derived Terrain Parameters for Hydrologic Applications in Țibleș and Rodnei Mountains (Romania)

• DOI: 10.24193/rcj2023_1
• Publication Date: 2023-05-25T09:18:16Z
• Authors: CARINA STRAPAZAN; ; ISTVÁN KOCSIS; ; IOAN-AUREL IRIMUȘ
• Keywords: Geography (General); accuracy; r; srtm; geospatial analysis; eu-dem; rstudio; G; resample; Geography. Anthropology. Recreation; G1-922; lidar; morphometry; digital elevation models

An Evaluation of Lidar, EU-DEM and SRTM-Derived Terrain Parameters for Hydrologic Applications in Țibleș Rodnei Mountains (Romania).Over the years numerous geospatial data sets have become accessible to users form various types digital elevation models (DEMs) at different resolutions.DEMs are often used study behavior hydrological response watersheds, so came be considered as a reflection their physiographic characteristics.Accurate determination catchment's morphometric parameters plays crucial role distributed modelling river flow estimation.This is divided into two parts objectives; first part examines accuracy DEMs from sources (EU-DEM, SRTM LIDAR) deriving terrain attributes by comparison, second one investigates ability resampling 3 m LIDAR DEM coarser cell resolutions, accurately represent extracted features.In order evaluate quality precision EU-DEM, high-resolution was reference set due its higher degree accuracy.Firstly, this resampled 25 30 match size, all them were re-projected same Stereo 70 coordinate system Romania.A comparison has been carried out between derived hydrologic variables DEMs.For research, also 10 subsequently, another similar evaluation made, but time with regards resolutions (3 m, m).Several catchments drainage areas (Țibleș, Runc, Sălăuța Valea Caselor) located chosen research.Several techniques available ArcMap evaluated, comparative analyzes using R software.Results revealed not only LiDAR's superior compared other sets, possibilities offered latter characteristics mountainous area, contingent upon what user aims achieve.