Results 181 to 190 of about 1,085,325 (248)

Digital Elevation Model

ACM SIGSPATIAL International Workshop on Advances in Geographic Information Systems, 2017
In principle, a digital elevation model (DEM) describes elevations of various points in a given area in digital format. In this chapter, only raster GIS based DEMs are discussed. Data for generating a DEM can be acquired from different sources such as: ground surveys, digitization of topographic contour maps, conventional aerial photographic ...
R. Gupta
semanticscholar   +4 more sources

Accuracy assessment of the global TanDEM-X digital elevation model in a mountain environment

, 2020
The past two decades have been prolific in production of global or near-global Digital Elevation Models (DEMs) derived from satellite data. The most recent addition to the family of global DEMs is the TanDEM-X DEM with resolution of 0.4 arc sec. DEMs are
Kateřina Gdulová, J. Marešová, Vítězslav Moudrý   +2 more
semanticscholar   +1 more source

Deep learning-based approach for landform classification from integrated data sources of digital elevation model and imagery

Geomorphology, 2020
Landform classification is one of the most important aspects in geomorphological research, dividing the Earth’s surface into diverse geomorphological types.
Sijin Li, Li-yang Xiong, G. Tang, J. Strobl   +3 more
semanticscholar   +1 more source

A digital elevation model based method for a rapid estimation of flood inundation depth

Journal of Flood Risk Management, 2019
In recent years, the acquisition of data from multiple sources, together with improvements in computational capabilities, has allowed to improve our understanding on natural hazard through new approaches based on machine learning and Big Data analytics ...
S. Manfreda, C. Samela
semanticscholar   +1 more source

Accuracy assessment of a low-cost UAV derived digital elevation model (DEM) in a highly broken and vegetated terrain

Measurement, 2019
Digital Elevation Models (DEMs) are frequently used in geology, environment, engineering and architecture related studies. Along with the technological advances, there are also improvements in the production techniques of these data.
Emre Akturk, A. Altunel
semanticscholar   +1 more source

Terrain Synthesis from Digital Elevation Models

IEEE Transactions on Visualization and Computer Graphics, 2007
In this paper, we present an example-based system for terrain synthesis. In our approach, patches from a sample terrain (represented by a height field) are used to generate a new terrain. The synthesis is guided by a user-sketched feature map that specifies where terrain features occur in the resulting synthetic terrain.
Howard, Zhou, Jie, Sun, Greg, Turk, James M, Rehg   +3 more
openaire   +2 more sources

Influence of digital elevation model resolution on rockfall modelling

Geomorphology, 2019
Spatial models are an effective tool for determining potential rockfall source, transit and deposit areas. The reliability of the final rockfall modelling results depends on the quality of the input data, which is mostly based on the digital elevation ...
B. Žabota, Blâz Repe, M. Kobal
semanticscholar   +1 more source

Digital Elevation Models By Laser Scanning

The Photogrammetric Record, 1998
The TopoSys laser scanner system is designed to produce digital elevation models (DEMs) at a maximum accuracy of 0.5 m in x and y and 0.1 m in z. The regular scan pattern and the measurement frequency of 80 000 measurements per second (on average 5 measurements per m2) form the basis for high quality DEMs.The mainly automated data processing makes it ...
openaire   +1 more source