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 76 for “"Vegetation Indices"”.
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Evaluation Of Selected Spectral Vegetation Indices In Senescent Rangeland Canopy Using Landsat Imagery
… species depends on the amount of nonproductive vegetation (NPV). To estimate NPV land managers are currently using the Robel pole visual obstruction reading methods. Researchers with the USDA Agricultural Research Service's (ARS) Northern Great Plains Research Laboratory in Mandan, ND, recently …
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From Hyperspectral Indices to Global Fluorescence: PACE Vegetation Indices as Predictors of Terrestrial Photosynthesis
… Color Instrument and globally distributed Land Vegetation Index (LANDVI) product suite. This study's primary contribution lies in demonstrating that PACE vegetation indices alone can reliably predict SIF from global retrievals obtained using data from the Copernicus Sentinel-5P Tropospheric …
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Spatial Patterns and Variations of Tornado Damage as Related to Southeastern Appalachian Forests and Terrain from the Franklin County, Virginia EF-3 Tornado
… areas, and this damage can be detected with vegetation indices derived from remotely sensed imagery. The objectives of this study were to 1) Classify forest damage from the April 19, 2019 EF-3 tornado in Franklin County, VA using remotely-sensed images, 2) Quantify the spatial patterns of …
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Arid land condition assessment and monitoring using mulitspectral and hyperspectral imagery.
… were four specific objectives: 1) to evaluate vegetation indices derived from multispectral satellite imagery for prediction of vegetation cover; 2) to compare vegetation indices and field measurements for detecting vegetation changes and assessing land condition; 3) to examine the potential of …
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Using GPS, GIS & remote sensing to understand Niagara Terroir
… data. Remote-sensing, through the calculation of vegetation indices, was particularly useful to predict vine vigor, yield, fruit maturity as well as berry monoterpene concentration; it could also clearly assist in making wines that are more representative ofthe cultivar used, and also wines that …
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Biosolids as a source of soil conditioning and fertility for turfgrass
… reflectance data to compare relationships of vegetation indices to soil and turfgrass parameters. We found that after an initial lag-time of one year, biosolids amendments increased turfgrass clipping biomass and aesthetic quality greater than did synthetic fertilizer. Repeated topdressing …
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Optimizing yield and crop nitrogen response characterization by integrating spectral reflectance and agronomic properties in sugarcane and rice
… but this effect was not carried over when vegetation indices were computed. Use of red-edge based vegetation indices improved the estimation of biomass and grain yield in rice. The effect of variety on the accuracy of the yield prediction model varied depending on the transformation of …
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Site-Specific In-Season Nitrogen Management Using Drone Multispectral Imagery And Proximal Sensing
… for their efficiency at producing corn grain. Vegetation indices from UAV-based multispectral sensing were compared to indices from other platforms and they were found to be comparable. The third chapter is a continuation of the second chapter but focuses on the VRN aspect of the four site-year …
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Application of optical and infrared remote sensing to the retrieval of selected land and sea features
… the test plots is predicted using a selection of vegetation indices, and multispectral reflectances. The results confirm the widely-held view that vegetation indices are not applicable to New Zealand pastures. Noticeably better results are achieved using the multispectral test plot reflectance in …
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Agricultural Crop Monitoring with Computer Vision
… Basic thresholding on pixel intensities and vegetation indices result in accuracies below 75% . Neural networks (NNs) and support vector machines (SVMs) label correctly at 89% and 79%, respectively, when given only visual information, and final accuracies of 97% when the near infrared is …
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Soil Respiration and Related Abiotic and Remotely Sensed Variables in Different Overstories and Understories in a High Elevation Southern Appalachian Forest
… of Rs under a natural hardwood system. The four vegetation types under consideration were an eastern hemlock (Tsuga canadensis L. Carriere) dominated overstory, a hardwood overstory with little to no understory, a mountain laurel (Kalmia latifolia L.) dominated understory, and a cinnamon fern …
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Factors affecting recent vegetation change in north-east Libya
… have led to changes and deterioration in natural vegetation across the world. The Al Jabal Al Akhdar, in north east Libya, is one of those areas that have experienced changes in land cover. This region has environmental and economic importance in providing suitable habitat for wildlife and …
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Multi-scale Remote Assessment of Phenology of Photosynthesis and Productivity of Northern Forests
… scale. However, traditional “greenness” based vegetation indices, like the normalized difference vegetation index (NDVI) which is sensitive to chlorophyll content, are often limited in monitoring the phenology of evergreen conifers due to the retention of green foliage year-round. Therefore, …
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Ecological Sustainability of Winter Harvesting in the Duck Mountain Provincial Park, SK: The Effects of Skidder Traffic, Slash Loading, and Cumulative Effects on Soils and Aspen Regeneration
… Skidder traffic intensity, slash coverage, and vegetation indices were calculated for six harvested blocks using Global Positioning Systems (GPS), Unoccupied Aerial Vehicles (UAVs) and Geographic Information Systems (GIS). Based on this information, soil bulk density and early sucker growth was …
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Remote sensing-based assessment of Gross Primary Production (GPP) in agricultural ecosystems
… of carbon gain, and satellite remotely-sensed vegetation indices (VIs). The data is brought together synthetically for major crops found in agricultural landscapes of Gwangwon Province, South Korea, e.g., rice, soybean, maize, potato, and sugar beet as a surrogate for radish. The long term goal …
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Intra-field Nitrogen Estimation for Wheat and Corn using Unmanned Aerial Vehicle-based and Satellite Multispectral Imagery, Plant Biophysical Variables, Field Properties, and Machine Learning Methods
… imagery, PlanetScope satellite imagery, vegetation indices (VI), crop height, leaf area index (LAI), field topographic metrics, and soil properties to predict canopy nitrogen weight (g/m2) of corn and wheat fields in southwestern Ontario, Canada. Random Forests (RF) and Support Vector …
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Mapping urban forest extent and modeling sequestered carbon across Chattanooga, TN using GIS and remote sensing
… Chattanooga’s urban trees using field data and vegetation indices, and finally 3) developed the first city-wide high-resolution land cover map across Chattanooga using SkySat imagery and object-based classification. Results found that Chattanooga has lost up to 43% of its urban tree canopy and …
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Synoptic Comparison of Salt Marsh Spatial Structure Using Hyperspectral Imagery at NOAA National Estuarine Research Reserves.
… overview and site comparisons of salt marsh vegetation for seven NERRs, within their respective growing seasons, using three remote sensing vegetation indices. Additionally, within and between site geospatial patterns were examined using two landscape metrics. The seven sites were located in …
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Mapping desertification: towards an approach for mapping regional land degradation in drylands
… were determined for the project area. Five vegetation indices (NDVI, EVI, SAVI, OSAVI, MSAVI), as well as spectral mixture analysis (SMA) cover estimates for perennial vegetation, bare ground and bare rock were calculated using both Landsat 8 and Sentinel-2A data. These variables were used …
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