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 10 of 10 for “"digital surface model"”.
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A new technique for 3D modeling of water surfaces using a Geiger mode receiver
… and quickly (i.e in real time) create a digital surface model of a water surface using bathymetric lidar when presented with water turbidity. Accurate and consistent modeling of the water surface is required in order to correct for the surface’s volatility when imaging the sea floor. …
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Informal settlement modeling using digital small-format aerial imagery
… include: (1) the use of color orthoimagery and digital surface model (DSM) generated from high-resoltion small-format digitial aerial imagery, (2) the separation of the shack reconstruction task into automated shack detection and interactive shack delineation, (3) the integration of multiple …
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Analysis of photogrammetrically-derived digital surface and terrain models for building recognition
… of three-dimensional CAD (computer aided design) models, is very important to many users such as architects, town planners and telecommunications and environmental engineers. This thesis examines the role of digital terrain and surface models in supporting this reconstruction process. The thesis …
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A Combined Method for Vegetation Classification Based on Visible Bands from UAV Images: A Case Study for Invasive Wild Parsnip Plants
… parsnip classification workflow based on UHR digital UAV imagery. The challenge is that all processing options are based only on visible bands information (RGB) of the digital cameras on UAV, which means there is no infrared spectral information to use. The UAV image processing flow included …
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Analysis of Viewshed Accuracy with Variable Resolution LIDAR Digital Surface Models and Photogrammetrically-Derived Digital Elevation Models
… Viewsheds are often generated using "bare-earth" Digital Elevation Models (DEMs) derived from the process of photogrammetry. More detailed models, known as Digital Surface Models (DSMs), are often generated using Light Detection and Ranging (LIDAR) which uses an airborne laser to scan the terrain. …
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Real-Time Realization of Lidar – Based Digital Surface Models for Airborne Safe Landing Zone Identification in Challenging Environments
… demand over the last two decades for generating digital surface models (DSMs) in real-time. One of the important applications for real-time DSMs is aircraft landing, especially in a degraded visual environment. In such a challenging environment, no clear visual conditions exist, which can …
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Unmanned Aerial Vehicle (UAV) navigation and image processing techniques for underground tunnel infrastructure assessment
… assessment. The Proximity Move-Pause-Photo for Surface Defect Inspection (PMPP-SDI) methodology is a technique for UAV tunnel inspection. The method uses flexible flight routines to follow the tunnel lining, enabling comprehensive coverage of the tunnel surface. This real-time reactive control …
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Accumulator-based three dimensional building boundary reconstruction framework for satellite images
… applications in computer vision such as 3D city modelling, radio network planning, urban planning, mapping, and navigation. Traditionally, 3D building models have been produced from multiview satellite images using dense pixel matching. The point clouds or Digital Surface Model (DSM)s produced …
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Contributions to Big Geospatial Data Rendering and Visualisations
… novel adjacency matrix extraction technique, 3D model mesh objects can be generated using both LiDAR and OSM information. The generation of model mesh objects created from OSM data utilises procedural content generation techniques, enabling the generation of GIS based 3D real-world scenes. …
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Examining UAV-based LiDAR, Multispectral, Hyperspectral and Precision Photogrammetry Approaches for Tidal Salt Marsh Environments
… under scenarios of sea level rise (SLR). Surface elevation relative to mean sea level is critical for the performance of salt marsh plants, as differences of a couple of tens of centimetres can lead to a shift in dominant species. Thus, achieving maximum vertical precision when studying …