Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 119 for “"Digital Elevation Model"”.
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Global Digital Elevation Model Accuracy Assessment in the Himalaya, Nepal
<p>Digital Elevation Models (DEMs) are digital representations of surface topography or terrain. Collection of DEM data can be done directly through surveying and taking ground control point (GCP) data in the field or indirectly with remote sensing using a variety of techniques. The accuracies of …
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The Effect of Digital Elevation Model Resolution on Wave Propagation Predictions at 24Ghz
Digital Elevation Models (DEMs) are computer-generated representations of the earth's surface. These surfaces can be used to predicted Line-of-Sight (LOS) radio propagation. DEM resolution can affect the results of this prediction. This study examines the effect of DEM resolution on accuracy by …
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On the development of a digital elevation model over South Africa using ground and satellite data
A digital elevation model (DEM) represents the bare land surface of the Earth. DEMs are used in a wide range of applications, including geological studies, geomorphology, water resources and hydrology, evaluation of natural hazards, and vegetation surveys. In recent years, DEMs have increasingly …
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An investigation into the geomorphology of the Hebron Fault, Namibia, using a satellite-derived, high-resolution digital elevation model (DEM)
… events. This study produces a high-resolution Digital Elevation Model (DEM) via stereophotogrammetry using pan-sharpened Worldview-3 satellite imagery (0.31 m resolution). The DEM was used for several geomorphological analyses. These included measuring the scarp height at 160 locations along …
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Synthetic aperture radar image simulator for interferometry
… form a synthetic image and requires inputs of a digital elevation model (DEM), flight path, description, radar parameters, a terrain classification map and temporal decorrelation factors. Output images include the following images: radar cross section, power, total coherence, temporal cohernece …
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Incipient continental rifting: insights from the Okavango Rift Zone, northwestern Botswana
… gravity, and Shuttle Radar Topography Mission Digital Elevation Model (SRTM DEM) data from the Okavango Rift Zone in northwest Botswana are used to map the distribution of rift and basement structures. The distribution of these structures provide useful insights into the early stages of …
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Mule Deer Habitat Modeling With the Use of Existing Government Data
… data: Gap Analysis Project (GAP) data, Digital Elevation Model (DEM) data and Digital Line Graph (DLG) data in a GIS mule deer habitat model. The study area was the Oglala National Grasslands and surrounding area of Northwest Nebraska. A GIS model of the study area was constructed and …
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Birds along a transect across KwaZulu-Natal: altitudinal preference and altitudinal migration
… Project (SABAP2), and altitudinal data from a Digital Elevation Model to try to understand altitudinal migration in a band of KwaZulu-Natal between 29°S and 30°S. The bird atlas provides data on a five minute grid, grid cells with sides of c. 9km, known as pentads. The Digital Elevation Model …
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Análise espacial das perdas de solo no Estado da Paraíba
… data such as time series of rainfall, soil map, digital elevation model and satellite image classification for the use and occupation, obtained in a GIS environment. The estimated loss of soil through USLE presented spatially as a result large loss of soil in the western portion of the state …
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Arc Hydro data model for Ethiopian watersheds
… of Ethiopia (MoWR) planned to develop a digital hydrologic data model that supports management of the country’s water resources. The purpose of this project is to use the Arc Hydro data model organize and manage water resource data in Ethiopia. To accomplish this, raw Shuttle Radar …
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Test of a method for recognizing unmapped seismogenic faults.
… quadrangle to define their intersection with a digital elevation model (DEM) of the ground surface. The intersection of a nodal plane with the ground surface is termed a seismo-lineament. Mapping seismo-lineaments onto a DEM yielded specific fault-location hypotheses that can be tested in the …
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GIS Modeling of Wetlands Elevation Change in Response to Projected Sea Level Rise, Trinity Bay, Texas
… is a test of a methodology to predict changes in elevation and shoreline position of coastal wetlands in Trinity Bay, Texas, in response to projected sea level rise. The study combines numerical modeling and a geographic information system. A smoothing technique is used on a United States …
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Development of HEC-HMS and HEC-RAS models for urban floodplain mapping and flood damage reduction in Brownsville, Texas
… project was to develop hydrologic and hydraulic models for the floodplain analysis for Brownsville, Texas and analyze mitigation alternatives within a Geographic Information Systems (GIS) and digital data framework. This framework allowed for flexible manipulation of data and easy interpretation …
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Dam break risk assessment in Baker Valley (Chilean Patagonia)
… of Rome - La Sapienza (Italy), a computational model was performed to simulate the flood wave propagation associated with a dam break failure scenario. The areas subject to flooding were mapped on the digital elevation model (DEM) of the surface topography.
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A comparison of slope estimation methods
… obtained by each, the accuracy of methods in modelling actual slope, and the suitability of these methods for site-specific and non-site specific applications. The data used in the study comprise of 24 artificial surfaces generated from mathematical equations and a natural surface represented …
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Gravitational Study of the Hastings Salt Dome and Associated Faults in Brazoria and Galveston Counties,Texas
… with the aid of a Trimble NOMAD GPS unit. A Digital Elevation Model over the study area was generated from LiDAR data and this provided elevation values for each gravity stations. These elevation values were used for elevation corrections (free-air correction and Bouguer correction), which is …
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Modeling sandbar effects on nearshore waves and morphological change using SWAN
Numerical model simulations (Delft3D SWAN) are used to examine the impact of small alongshore variations in the bathymetry of an outer sandbar (in about 5-m water depth) on the nearshore wave field as the shallow (< 3 m) bathymetry changes from near alongshore uniform to strongly spatially variable …
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Examining Residents' Vulnerability from the Flood Hazard in the Onion Creek Neighborhood of Austin Texas: Who is At-Risk and Why?
… falls within the base floodplains where Base elevations are provided. As a result, it is a high-intensity flood zone. Demographically speaking, the region is occupied by residents of which the majority live above the poverty line and have an average Household Income of over $90,000. The aim of …
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Identifying Locations Of Highly Eroded Agricultural Land In The Devils Lake Basin, ND Using GIS Terrain Analysis Modeling
<p>Soil erosion modeling using terrain analysis holds great potential due to the simplicity of the models, and the ease in running the analysis in a GIS. Terrain analysis of the upper Devils Lake basin was conducted using a 3-meter Light Detection and Ranging-derived digital elevation model. …
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Modeling Sandbar Effects on Nearshore Waves and Morphological Change using SWAN
Numerical model simulations (Delft3D SWAN) are used to examine the impact of small alongshore variations in the bathymetry of an outer sandbar (in about 5-m water depth) on the nearshore wave field as the shallow (< 3 m) bathymetry changes from near alongshore uniform to strongly spatially variable …
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