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.
Results
Showing 1 to 20 of 33 for “"spectral indices"”.
-
Hyperspectral and Thermal Remote Sensing of Plant Stress Reponses to Oil Pollution.
This study investigates the potential use of hyperspectral and thermal remote sensing for the early pre-visual detection and quantification of plant stress caused by oil pollution. Further, it examines the potential for these techniques to discriminate between oil pollution and two typically …
-
Evaluating the suitability of UAV data for mapping dominant plant species in a heterogenous fynbos seep wetland
… has not been explored. This study used multispectral UAV photography from Parrot Sequoia and Micasense RedEdge- M multispectral cameras to discriminate eleven wetland Fynbos plant species in a seep wetland located in the Steenbras Nature Reserve in the Western Cape province of South Africa. …
-
Assessing the Effectiveness of Louisiana's Freshwater Diversion Projects Using Remote Sensing
… 1974 to 2006 were analyzed by computing several spectral indices including NDVI, VI, IR/R, Sqrt IR/R, T-NDVI, and NDWI, as well as principle component analysis. The resulting enhanced images were classified into two classes, vegetation or open water. The ratios of vegetation to open water were …
-
RADIO STUDY OF SUPERNOVA REMNANTS: UNDERSTANDING THE MISSING SUPERNOVA REMNANT PROBLEM
… 390 SNRs, investigating their diameters, ages, spectral indices, Galactic heights, and spherical symmetries. The accuracy of distance estimation using the Σ-D relation was also examined. The average diameter of Galactic SNRs was determined to be 30.5 pc, with a standard error of 1.7 pc and a …
-
Multifrequency monitoring of blazars
… for each source with a discussion of the spectral indices. A statistical analysis has been performed on these indices in an attempt to differentiate any differences between the two classes of object under study. Finally, two existing models are discussed and data from the 1988 flare of the …
-
Multiwavelength Studies of Rotating Radio Transients
… show evidence for an additional power-law tail. Spectral indices are calculated for the seven RRATs which were detected at multiple frequencies. These RRATs have a mean spectral index of ⟨alpha SI⟩ = -3.2(7), or ⟨alphaSI ln> = -3.1(1) when using mean flux densities derived from …
-
Irrigator Responses to Changes in Water Availability in Idaho's Snake River Plain
… were used to compare the performance of three spectral indices, three compositing algorithms and two sensors for 2002 and 2007 for distinguishing between irrigated and non-irrigated parcels. We demonstrate that, on average, the seasonal-maximum algorithm yields a 60% reduction in county scale …
-
Baroreflex sensitivity and developmental coordination disorder
… and RR interval were recorded (standard ECG). Spectral indices were computed using Fast Fourier Transform and transfer function analysis was used to compute BRS. High frequency and low frequency power spectral areas were set to 0.15-0.6 Hz and 0.04-0.15 Hz, respectively. BRS was compared …
-
Sustainable Intensification of Agriculture: Opportunities and Challenges for Food Security and Agrarian Adaptation to Environmental Change in Bangladesh
… the combination of a harmonic time series model, spectral indices, and rice phenology can produce relatively accurate predictions of dry season rice in Bangladesh compared to district-level reference information. Overall, the findings from this investigation of SAI support continued efforts to …
-
Monte Carlo study of pebble bed reactor fuel reactivity and isotopics
… models were then used to calculate reactivity, spectral indices, and bumup isotopics for a cold 100 MWD/kgU burnup scenario. The results of these calculations showed that the methods employed in this thesis are in good agreement with work previously published regarding benchmarking of codes on …
-
Remote sensing of grassland with contaminated soil using the spectral red-edge
… soil contaminants were detected<br/>using the spectral red-edge to indicate vegetation stress caused by the presence of<br/>the contaminants. An improved red-edge position (REP) was developed and gave a<br/>slight improvement in the predictive capability over existing indices and an …
-
MeerKAT observations of novalike cataclysmic variables
… novalikes. In-band (0.9–1.7 GHz) radio spectral indices are measured, and are found to be consistent with reports from earlier work. I construct broad spectral energy distributions for this sample from published multi-wavelength data, and use them to place constraints on the mass …
-
Effects of Excessive Soil Phosphorus on Pinus taeda L. Nutrient Uptake, Survival, and Growth
… was used to derive NDVI, GNDVI, NDRE, and RECI indices. Seedling mortality increased with higher P application rates, and chlorophyll concentrations declined under conditions of elevated P. Of the spectral indices, NDVI explained the greatest proportion of variation in chlorophyll content, while …
-
Turbulence and transport phenomena in edge and scrape-off-layer plasmas
… The analysis of the physical scale includes spectral analysis, yielding robust spectral indices beta= ~4.5 for larger wavenumbers and a sensitive spectral shape for lower wavenumbers, and the first spectral transfer measurement of turbulence on C-Mod, showing that the critical scale feeds …
-
An object-based image analysis approach for detecting urban impervious surfaces
… for automated classification because of its high spectral variability and complex land covers in urban areas. Accurate and rapid classification of impervious surfaces would help in emergency management after extreme events like flooding, earthquakes, fires, tsunami, and hurricanes, by providing …
-
Spatio-temporal analysis of coastal sediment erosion in Cape Town through remote sensing and geoinformation science
… to the high-water mark and on reclaimed land. Spectral indices and classification techniques are explored to accommodate the complex bio-optical properties of coastal zones. This allows for the segmentation of land and ocean components to extract shorelines from multispectral Landsat imagery …
-
Analysis of Reconstructed Mine Soils on Reclaimed Coal and Mineral Sands Mined Lands in Virginia
… for soybean in 2020. Coloration and Fe-oxide spectral indices had weak to moderate negative correlations with yield. Berm positions supported better soybean growth (three out of five sites), while pit positions were redder/darker (one out of five sites). Current Soil Taxonomy conveys …
-
High-Throughput Phenotyping and Genomic Prediction in Multi-Environment Plant Breeding Field Trials
… 2020 and 2021 growing seasons. UAV-based multispectral imaging was conducted at 10-15 timepoints throughout phenological development and spectral summary statistics, spectral indices, and texture features were extracted at each timepoint. LASSO regression models trained on image feature sets …
-
Quantifying nutrient cycling and fate within an abandoned feedlot and adjacent wetlands
… Operations. It is also hypothesized that a spectral vegetation index can be used as an effective indicator of plant-available soil nutrients and optimum soil conditions for precise decision-making in fertilizer application. To test these hypotheses, analysis of soils, graminoid tissues, …
-
Quantification and propagation of nuclear data uncertainties
… effective multiplication factor, leakage, and spectral indices of the Lady Godiva and Jezebel critical assemblies are quantified. Using principal component analysis on the PFNS covariance matrices results in needing only 2-3 principal components to retain the PFNS uncertainties. Then, using the …
Page 1 of 2