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 47 for “"Surface Reflectance"”.
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Surface reflectance characteristics of Langjökull, Iceland
… ETM+ and MODIS radiance data collected for the surface of Langjokull during August 2007. Radiance data from the three different instruments was then converted to surface broadband albedo using a number of different methods. The differences between the methods used to derive the surface albedo …
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Surface reflectance recognition and real-world illumination statistics
… cannot solve this problem at all. Recognizing surface reflectance properties from a single photograph is difficult because the observed image depends heavily on the amount of light incident from every direction. A mirrored sphere, for example, produces a different image in every environment. To …
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Image statistics and the perception of surface reflectance
Humans are surprisingly good at judging the reflectance of complex surfaces even when the surfaces are viewed in isolation, contrary to the Gelb effect. We argue that textural cues are important for this task. Traditional machine vision systems, on the other hand, are incapable of recognizing …
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Surface Reflectance Studies of Rare Gases Adsorbed on Metal and Oxide Surfaces
Made available in DSpace on 2015-05-13T15:22:17Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8009047.PDF: 5058317 bytes, checksum: a4f6e346c65fb9ed905f1f38e26c6273 (MD5) Previous issue date: 1979
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Surface reflectance core spectroscopy of halogens, rare gases, alkalis and CO on metal surfaces
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-28T15:03:36Z No. of bitstreams: 1 1980_cunningham.pdf: 5039429 bytes, checksum: 6a907df332d48a6816d0e9530d260918 (MD5)
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Surface Reflectance Core Spectroscopy of Halogens, Rare Gases, Alkalis and Carbon-Monoxide on Metal Surfaces
… the CO molecule adsorbed on metal and insulating surfaces are described. This research employed synchrotron radiation in the energy range from 4 to 20 eV, using both s and p polarized light. Results for adsorbates in three neighboring columns of the Periodic Table principally reveal charge …
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Aerosol optical depth retrievals from high-resolution commercial satellite imagery over areas of high surface reflectance
… methods typically fail over areas with high surface reflectance, such as urban areas and deserts, since the upwelling radiance due to scattering by aerosols is small compared to the radiance resulting from surface reflection. The method proposed here uses shadows cast on the surface to …
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Development of a multispectral albedometer and deployment on an unmanned aircraft for evaluating satellite retrieved surface reflectance over Nevada's Black Rock Desert
… measurements areneeded over a variety of land surfaces. Inhomogeneous and bright surface reflectanceacross California and Nevada may be a contributing factor in the discrepancies observedbetween ground based and satellite-retrieved atmospheric aerosol optical depth (AOD).We developed and …
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Human visual perception under real-world illumination
… the visual system achieve stable estimates of surface properties - such as reflectance and 3D shape - across changes in the illumination? Under arbitrary patterns of illumination this problem is ill-posed. However, in the real world, illumination is not arbitrary. Here I argue that the visual …
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A data-driven reflectance model
… a data-driven model for isotropic bidirectional reflectance distribution functions (BRDFs) based on acquired reflectance data. Instead of using analytic reflectance models, each BRDF is represented as a dense set of measurements. This representation allows interpolation and extrapolation in the …
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Variations in modelled and measured hyperspectral remote sensing reflectance
Measurements of hyperspectral surface reflectance, with a spectral range of 350-800nm and sampling interval of 3.3nm, were made in Scottish coastal waters, the Bristol Channel and the Atlantic Ocean. Analysis of the shape of these spectra by normalisation and differentiation revealed three …
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Surface Prior Information Reflectance Estimation (SPIRE) algorithms
… we address the problem of estimating changes in surface reflectance in hyperspectral image cubes, under unknown multiplicative and additive illumination noise. Rather than using the Empirical Line Method (ELM) or physics-based approaches, we assumed the presence of a prior reflectance image cube …
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CHARACTERIZATION OF CERAMIC MATRIX COMPOSITE MATERIALS USING MILLIMETER-WAVE TECHNIQUES
… for the Oxide/Oxide material, and the front surface reflectance was determined for the SiC/SiNC material. A discussion of changes in sample optical properties due to material fatiguing will be included. This document will conclude with the complete spectra and statistical analyses of the …
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Robust and efficient image-based 3D modeling
… the relationships between illuminants, surface reflection and shape to increase the robustness of stereo vision. I first present a new image transform for matching low-textured regions and then a robust solution for illumination chromaticity estimation based on a new correspondence …
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Remote measurement of aerosol optical properties using the NOAA POES AVHRR during ACE-1, TARFOX and ACE-2
… theory with an estimate of bi-directional surface reflectance. Phase functions are parameterized using an aerosol distribution model and the ratio of radiance values measured in channels 1 and 2 of the AVHRR. Automated cloud screening and sun glint removal is included. Retrieved satellite …
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Atmospheric Pressure Chemical Vapor Deposition of Functional Oxide Materials for Crystalline Silicon Solar Cells
… the following purposes: (1) to minimize front surface reflectance without increasing parasitic absorption within the anti-reflection coating(s); (2) to maximize internal back reflectance of rear passivated cells, thereby increasing optical absorption of weakly absorbed long wavelength photons …
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Accelerating Bayesian Computation in Earth Remote Sensing Problems
… remote sensing is an inverse problem that fits surface and atmospheric models to imaging spectrometer data and is critical to the analysis of the composition and biodiversity of the Earth surface. Current methods for remote sensing generally involve retrieving a point estimate of the surface …
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A new technique to find both real and imaginary index of refraction of atmospheric aerosols from clear sky radiance measurements.
… Rayleigh optical depth, aerosol optical depth, surface albedo, and preferably the surface anisotropic characteristics be known from correlative measurements. The calculated optimal radiance ratio, which is the ratio of maximum sensitivity to the index being retrieved with minimum sensitivity to …
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Improving satellite data interoperability: Large-scale data integration and agricultural applications in the US Midwest
… presents a complete pipeline to derive reliable surface reflectance data from the PlanetScope CubeSat constellation; the third study introduces a method of real-time crop stress monitoring enabled by predicting the Green Chlorophyll Vegetation Index (GCVI) with a neural network. The algorithms …
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