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 64 for “"spectral reflectance"”.
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Spectral reflectance curves of the planet Mercury.
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Relating size and spectral reflectance properties of S-type asteroids
The spectral slopes of 701 S-type asteroids have been statistically shown to depend on asteroid size. The spectral reflectance data were taken during the second phase of the Small Main-belt Asteroid Spectroscopic Survey. It was concluded that larger S-type asteroids have a higher spectral slope …
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Expanding the Application of Spectral Reflectance Measurement in Turfgrass Systems
Light reflectance from plants can be used as a non-invasive predictor of health and yield for many cropping systems, and has been investigated to a lesser extent with managed turfgrass systems. The frequent agronomic inputs associated with maintaining golf course grasses allow for exceptional stand …
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Visible spectral reflectance measurements of the Galilean satellites of Jupiter (MORE)
Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Spectral Reflectance as an Indicator of Water Quality in Streams Impacted by Mine Drainage
… sulfate concentrations were estimated from the spectral reflectance of the resident mine drainage sediments. Mine drainage sediments were collected from sites in the anthracite coal region of eastern Pennsylvania,representing acid to near neutral pH. Sediment color was determined using chroma …
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Assessment of Spectral Reflectance as Part of a Variable-Rate Nitrogen Management Strategy for Corn
Spectral reflectance-based, remote sensing technology has been used to adjust in-season nitrogen (N) fertilizer rates for wheat to account for spatial variability in grain yield potential at a sub-meter resolution. The objective of this study was to examine the relationships among spectral …
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Optimizing yield and crop nitrogen response characterization by integrating spectral reflectance and agronomic properties in sugarcane and rice
… turbidity and depth on red and red-edge reflectance based prediction models for biomass and grain yield in rice, 2) evaluate agronomic parameters of different sugar cane varieties in response to variable levels of nitrogen supply, and 3) determine the effect of sugarcane varieties on the …
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Tailoring the angular and spectral reflectance characteristics of color-dynamic films by modifying their photonic texture and topcoat roughness
… Texture of the photonic structure affects the spectral signature and angular distribution of reflected light. Surface roughness of the topcoat affects the angular distribution of incident and reflected light. Fourier optics concepts are harnessed for modeling and predicting the optical …
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The determination of Dyers' perceived components of colour difference (depth, brightness and hue) between twp similar colours from theor spectral reflectance values
… ΔD, brightness, ΔB, and hue, ΔH*) from the reflectance values of a pair of dyeings, enabling the dyer to take full advantage of colorimetric analysis. The algorithm was based on extensive experimental work to map surfaces of constant visual depth throughout the colour space and the thesis …
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Advances in the Hyperspectral Imaging Microscope Spectrometer Method, and Application for Measuring the Spectral Reflectance of Light Absorbing Aerosols from the South Cascades, Colorado Rockies, and Iceland
… properties (Kaspari et al., 2014). A new hyperspectral imaging microscope spectrometer (HIMS) method was recently developed to measure LAA spectral reflectance at the particle scale. The objectives for this study are to do the following: 1. Advance the HIMS method by determining the …
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Using Leaf Spectra to Elucidate the Taxonomy and Ecology of Living and Dried Plants
… and management of nature. The shortwave spectral reflectance of leaves is a promising tool for rapidly identifying species at different taxonomic ranks and predicting important plant functional traits. However, the spectral reflectance of leaves changes in response to biotic and abiotic …
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Remote Sensing for Precision Agriculture: Within -Field Spatial Variability Analysis and Mapping With Aerial Digital Multispectral Images
… mapping units with an average accuracy of 76%. Spectral reflectance from a crop field was highly correlated to the chlorophyll reading. A regression model developed to predict nitrogen stress in corn identified nitrogen-stressed areas from nitrogen-sufficient areas with a high accuracy (R2 = …
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Development of an optical sensor for real-time weed detection using laser based spectroscopy
… plant species can be performed based on the spectral reflectance of the leaves. This thesis describes the development of a sensor for automatic spot spraying of weeds within crop rows. The sensor records the relative intensity of reflected light in three narrow wavebands using lasers as an …
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A Methodology For Using Thematic Mapper Landsat Remotely Sensed Data to Determine Environmental Quality
… Mapper remotely sensed digital data and the spectral reflectance of an ecosystem. This relationship can be used to infer environmental quality of a pristine wilderness area, such as Piney Creek Wilderness. The environmental variables studied were geology, topography, soils, hydrology, …
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Winter Barley as a Commodity Cover Crop in the Mid-Atlantic Coastal Plain and Evaluation of Soft Red Winter Wheat Nitrogen Use Efficiency by Genotype, and its Prediction of Nitrogen Use Efficiency through Canopy Spectral Reflectance in the Eastern US
… by characterizing genotypes for NUE using canopy spectral reflectance [(CSR), a cheap, rapid and non-destructive remote sensing tool]. The other objectives of this study were to evaluate the predictive potential of vegetative reflection indices for wheat nitrogen use efficiency (NUE) by genotype …
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Biosolids as a source of soil conditioning and fertility for turfgrass
… risk of P loss in a field study; and 2) to use spectral 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 …
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Soil Moisture Estimation From Soil Spectral Characteristics in a Precision Farming Environment
Spectral reflectance data were analyzed in conjunction with surface moisture data to determine the nature of the relationship between the two. For one of the fields, the strongest relationship between reflectance and surface moisture was between 550 and 620 nm. For the other, the strongest …
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Special Reflectance of Hydrophytes
… of wetlands on remotely sensed imagery. Spectral reflectance measurements of 10 species of hydrophytes were made with an Exotach radiometer during three phenological stages, flowering and early seed, senescence, and early emergent. Reflectance data were analyzed to determine significant …
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Multi-wavelength, multi-beam, photonic based sensor for object discrimination and positioning
… materials are discriminated by measuring their reflectance characteristics at specific wavelengths and matching them with their spectral reflectance curves. With the recent advances in the development of high-speed sensors and high-speed data processors, the implementation of multi-wavelength …
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A trainable image pattern classification system for detection of damaged soybean seeds
… a means of identifying that differences in spectral reflectance existed which could be used for discriminating among asymptomatic soybean seeds and seeds discolored by a pathogen. This knowledge also aided in identifying the feasibility of using color filters as a means for separation of …
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