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 21 for “"Digital Terrain Model"”.
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The theory and application of the digital terrain model
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1958.
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The application of the digital terrain model principle to the problem of highway location
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1959
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Hydraulic and geospatial analyses of stream engineering and habitat restoration near Los Lunas, NM
… goals. These procedures include adjustment of a digital terrain model for hydraulic accuracy, the use of the digital terrain model and aerial imagery for the digitization of features used in hydraulic modeling, and the geospatial analyses of the resulting hydraulic model parameters of depth, …
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Caracterização geomorfológica e tectônica da carta Conde 1:25.000.
… thematic maps (hypsometric and slope) and the Digital Terrain Model (DTM), generated from the vectorization of the topographic abovementioned chart. The comprised area, is located on the eastern edge of the Paraíba state in Brazilian northeast, which is superimposed in the coastal trays. During …
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DTM Generation in Forested Areas from Full-Waveform Airborne LiDAR Data
… study was aimed at improving overall quality of Digital Terrain Model (DTM) extraction from full-waveform LiDAR data. Specifically, the primary goal was to develop a novel method to improve DTM extraction by utilizing low amplitude pulses that are generated by terrain under vegetation, but …
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Computational methods for the shape from shading problem
… ranging from simple smooth surfaces to complex digital terrain model data. We consider three different approaches. The first approach revisits the method of characteristic strips with a view to using more stable integration schemes than had been used in earlier works. Stable schemes, coupled …
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A Deep Learning Study on the Retrieval of Forest Parameters from Spaceborne Earth Observation Sensors
… The design and the understanding of the model is driven by explainable AI principles and by considerations on large-scale forest dynamics, with a great emphasis set on the challenges related to the variable acquisition geometry of the TanDEM-X mission, and by relying on the use of …
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Integrating Digital Aerial Photography and Lidar-Derived Information For Object-Based Coastal Tidal Marsh Classification Using Tree-Based Ensemble Algorithms
… and juncus roemerianus. A high-resolution Digital Terrain Model (DTM) was first developed from LiDAR bare earth data, based on which topographic features including slope and aspect were extracted. All the LiDAR-derived altimetry and intensity data were then combined with CIR spectral bands …
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Using a ground-based lidar instrument (Echidna ®) to reconstruct three-dimensional forest structure for biophysical and ecological studies
… lidar data. I generate a fine-resolution digital terrain model (DTM) and canopy height model (CHM) at each site, to measure individual DBH and tree height more accurately. In an ecological application, I reconstruct three-dimensional bat flight trajectories using imaging data from thermal …
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Modellierung von Flächendatensätzen der Oberflächentemperatur, Strahlungsbilanz und Kaltluftproduktion in windschwachen Strahlungsnächten
… by a relief analysis based on data from a digital terrain model, while data on landuse were likewise considered. Based on a fuzzy -cluster algorithm approach, the correlation between the synthetic pattern derived from a DTM in combination with the landuse and the surface temperature of the …
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Exploiting Signals of Opportunity for High-Precision PNT: Optimized Bayesian Estimation Across 5G and LEO Networks
… architectures are severely corrupted by the unmodeled, asynchronous clock drifts inherent in LEO communication constellations. This thesis makes four main contributions. First, a data-driven covariance adaptation framework is developed for terrestrial 5G positioning, enabling Bayesian …
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Digital Terrain Models for Radio Path Loss Calculations
This work addresses the problem of digital terrain modelling for estimating radio path propagation within a mobile communication system. The ideal requirements are for a data structure which is storage efficient and computationally efficient for calculating profiles, whilst elevation errors should …
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Estimating pre-fire forest structure with stereo imagery and post-fire lidar
… used as inputs for fire behavior and effects modelling. However, lidar is rarely available to document pre-fire conditions due to its sparse availability. In contrast, aerial imagery is regularly collected in many regions, and advances in stereo image matching have enabled the creation of …
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Remote Sensing For An Improved Geospatial Flash Flood Susceptibility Modeling Over An Arid Environment
… measurements. Moreover, statistical error models were employed to quantify the uncertainties in the daily GSPEs. Accurate digital terrain model (DTM) and channel network/orders with fine spatial details are mandatory for flood extent modeling. The DTM and its derived channel network have …
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Estimating Plot-Level Forest Biophysical Parameters Using Small-Footprint Airborne Lidar Measurements
… lidar surface. This study derived the digital terrain model from lidar data using an iterative slope-based algorithm and developed processing methods for directly measuring tree height, crown diameter, and stand density. The lidar system used for this study recorded up to four returns …
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EnogisAI: An Artificial Intelligence Framework for Predictive Agronomics
… from the data integration processes through model definition, training, and validation to the development of Decision Support Systems (DSSs) for farmers and agronomists. EnogisAI outputs are integrated within the Enogis agronomic management web platform, used to manage one-fourth of the total …
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FUSING GEDI LIDAR AND TANDEM-X INSAR OBSERVATIONS FOR IMPROVED FOREST STRUCTURE AND BIOMASS MAPPING
… investigated. First, a simulated GEDI-derived digital terrain model (DTM) was utilized to improve height estimation from TDX. Forest heights were initially derived from TDX coherence alone as a baseline using the widely used Random Volume over Ground (RVoG) scattering model. Here, assumptions …
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Large-scale 3D environmental modelling and visualisation for flood hazard warning.
… warning. The work consists of three main parts: digital terrain modelling; 3D environmental reconstruction and system development; flood simulation models. The digital terrain model is constructed using real world measurement data of GIS, in terms of digital elevation data and satellite image …
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Object-based image analysis for detecting landforms diagnostic of natural hazards
… such as roughness, which can be captured from digital elevation data, can reveal landforms diagnostic of natural hazards, such as gullies, dunes, lava fields, landslides and snow avalanches, as these landforms tend to be more heterogeneous than the surrounding landscape. A single roughness …
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