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 13 of 13 for “"RTK GPS"”.
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Navigation Control for Autonomous Tractor Guidance
… an agricultural tractor platform equipped with RTK-GPS and FOG posture sensors. The field tests showed that the root mean squared (RMS) offset error was less than 0.05 m and the maximum offset error was less than 0.1 m for a straight path at speeds of up to 3 m/s . The RMS offset error was less …
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Factors That Affect the Global Positioning System and Global Navigation Satellite System in an Urban and Forested Environment.
… accuracy in real time measurements acquired from GPS and GLONASS satellite observations using RTK techniques in an urban and forested environment. To determine this accuracy, 2 data sets of 3-dimensional coordinates were created and compared at 14 stations situated at East Tennessee State …
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Full season navigation and control of ultra-compact autonomous ag-bot in GPS denied environment
… using only a 2-D Hokuyo UST-10LX LiDAR and an RTK GPS as the primary sensors for navigation. Its purpose is to ensure that the robot can navigate through rows of crops without damaging the plants in narrow row-based and high-leaf-cover semi-structured crop plantations, such as corn (Zea mays), …
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Exactitude et précision de la mesure de superficie de parcelle de culture
… to suitable methods: (1) Total Station, (2) GPS (RTK GPS and DGPS) and (3) Topofil and Compass (forest instruments). These instruments are used in the field to confirm the three variance computation formulas. For all instruments used, approximate and observed variances are equivalent. Two …
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Depositional Model of a Late Cretaceous Dinosaur Fossil Concentration, Lance Formation
… observed and mapped using real time kinematic (RTK) GPS equipment. For 3D analysis of the bonebed, we unitized a large GPS dataset collected over 20 years of excavation. Displaying and manipulating the points in ArcGIS allowed investigation of bone arrangement vertically and laterally within the …
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Semi-Dense Stereo Reconstruction from Aerial Imagery for Improved Obstacle Detection
… the rigid transformation between frames. The RTK-GPS constrained pose estimate from the UAV is fused with the feature matched estimate to align the reconstruction and eliminate drift. The reconstruction was tested on both simulated and real data. The results indicate that this approach …
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Oceanographic considerations for the management and protection of surfing breaks
… echo sounding system was utilised and a RTK GPS water level correction and hydrographic GIS methodology developed. Including surfing in coastal management requires coastal engineering solutions that incorporate surfing. As an example, the efficacy of the artificial surfing reef (ASR) at …
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Spatio-temporal analysis of coastal sediment erosion in Cape Town through remote sensing and geoinformation science
… at the pixel level by comparison to an in-field RTK GPS survey used to capture the current state of the beaches. The results depict a sediment deficit in Kommetjie whilst accretion is prevalent along the Milnerton coastline. Shoreline propagation and coastal erosion quantification leads to a …
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Three-dimensional eolian bounding surface architecture of the Entrada sandstone, Utah: expanding our understanding of reservoir heterogeneity in wet eolian systems
… petrography) with advanced technologies (e.g, RTK GPS data, drone-derived digital outcrop models) to precisely resolve the kilometer-scale three-dimensional stratigraphic architecture of wet eolian Middle Jurassic Entrada Sandstone outcrops located ~60 km south of Moab, Utah at Rone Bailey Mesa …
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Three-dimensional eolian bounding surface architecture of the Entrada sandstone, Utah: expanding our understanding of reservoir heterogeneity in wet eolian systems
… petrography) with advanced technologies (e.g, RTK GPS data, drone-derived digital outcrop models) to precisely resolve the kilometer-scale three-dimensional stratigraphic architecture of wet eolian Middle Jurassic Entrada Sandstone outcrops located ~60 km south of Moab, Utah at Rone Bailey Mesa …
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A contextual AR model based system on-site construction planning
… Class (IFC) data model. Positioning data from RTK-GPS and an electronic compass enabled the geo-located 3D model to be registered in world coordinates and visualised using a head mounted display fitted with a ii forward facing video camera. The scheduling of construction tasks was achieved …
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Autonomous ground-based robotic navigation for an agricultural row crop environment
… ten field tests that utilizing highly accurate GPS systems results in the greatest navigation accuracy, with an average offset of 3.56-inches. During the agricultural growing season, many row crops produce a canopy that restricts the ability to observe and measure the various atmospheric and …
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Geo-referencing and mosaicing agricultural field images from a close-range sensing platform
… a Real-Time Kinematic Global Positioning System (RTK-GPS) to assure the accuracy. Since there are not enough features in the field, the algorithm of the image mosaic for the tower system is based on geographical information rather than features. Moreover, comparing to aerial and satellite systems, …