Results 31 to 40 of about 245,568 (297)

TERRA: Terrain Extraction from elevation Rasters through Repetitive Anisotropic filtering

open access: yesInternational Journal of Applied Earth Observations and Geoinformation, 2020
Over the past decades, several filters have been developed to derive a Digital Terrain Model (DTM) from a Digital Surface Model (DSM), by means of filtering out aboveground objects such as vegetation.
Anton Pijl   +5 more
doaj   +1 more source

The first ultra-high resolution Digital Terrain Model of the shallow-water sector around Lipari Island (Aeolian Islands, Italy) [PDF]

open access: yes, 2015
Very high resolution bathymetric map obtained through multibeam echosounders data are crucial to generate accurate Digital Terrain Models from which the morphological setting of active volcanic areas can be analyzed in detail. Here we show and discuss
Anzidei, M   +5 more
core   +2 more sources

Analysis of methods for generation of digital relief model and accuracy evaluation using digital photogrammetry technology

open access: yesGeodesy and Cartography, 2012
Digital photogrammetry methods are applied for generation of orthophotographic maps. For this purpose, orientation of aerial photographs has been carried out and generated a digital terrain model of the Earth’s surface (DEM), digital orthophotographic ...
Birutė Ruzgienė
doaj   +1 more source

Inner zone terrain correction calculation using interpolated heights

open access: yesContributions to Geophysics and Geodesy, 2015
The discrepancy between real heights of gravity points and the elevation model has a significant impact on the terrain corrections calculation especially within the inner zone.
Pavol ZAHOREC
doaj   +1 more source

DEM in quantitative analysis of structural geomorphology: application and prospect

open access: yesDizhi lixue xuebao, 2021
Digital elevation model (DEM) is used to realize the digital simulation of terrain surface (i.e. the digital representation of terrain surface shape) through the limited terrain elevation data.
CAO Pengju   +5 more
doaj   +1 more source

Influence of micro-topography and crown characteristics on tree height estimations in tropical forests based on LiDAR canopy height models. [PDF]

open access: yes, 2017
Tree or canopy height is an important attribute for carbon stock estimation, forest management and habitat quality assessment. Airborne Laser Scanning (ALS) based on Light Detection and Ranging (LiDAR) has advantages over other remote sensing techniques ...
Alexander, Cici   +2 more
core   +1 more source

VISUALISATION OF THE 3D GEODATA MODELS AND THEIR APPLICATION [PDF]

open access: yesGeodetski Glasnik, 2014
This paper describes the 3D geodata models and their application. On geodetic plans and topographic maps commonly applied methods of terrain (relief) by spots elevation and contour lines.
Mirko Borisov   +2 more
doaj   +1 more source

Improvement of Terrain Entropy Calculation for Grid Digital Elevation Models Considering Spatial Structural Features

open access: yesApplied Sciences
Existing methods for calculating terrain entropy in grid digital elevation models (DEMs) often face computational anomalies in specific topographies within small windows.
Fangbin Zhou   +3 more
doaj   +1 more source

Spectral filtering as a method of visualising and removing striped artefacts in digital elevation data [PDF]

open access: yes, 2008
Spectral filtering was compared with traditional mean spatial filters to assess their ability to identify and remove striped artefacts in digital elevation data. The techniques were applied to two datasets: a 100 m contour derived digital elevation model
Albani   +51 more
core   +1 more source

Terrain correction computations using digital density model of topographic masses [PDF]

open access: yesGeodetski Vestnik, 2018
This paper presents the determination of terrain correction by the means of the Digital Density Model (DDM) of topographic masses (Earth’s crust mass above the geoid) for the territory of Serbia. The DDM is determined using the Digital Terrain Model (DTM)
Oleg R. Odalović   +5 more
doaj   +1 more source

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