Results 251 to 260 of about 369,559 (294)

Hamiltonian indices and rational spectral densities

1980 19th IEEE Conference on Decision and Control including the Symposium on Adaptive Processes, 1980
In this note we announce several (global) topological properties of various spaces of linear systems, particularly symmetric, lossless, and Hamiltonian systems and (for the first time) multivariable spectral densities of fixed McMillan degree. Such a study is motivated by a result asserting that on a connected but not simply connected manifold, one ...
Christopher Byrnes, Tyrone Duncan
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Spectral indices in N-Space

Remote Sensing of Environment, 1983
Linear combinations of n spectral bands form physically significant indices in n-dimensional space. The 2-dimensional (2-D) perpendicular vegetation index (PVI) of Richardson and Wiegand and the 4-D tasseled cap of Kauth and Thomas are special cases of n-space indices.
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Atmospheric effects and spectral vegetation indices

Remote Sensing of Environment, 1994
Abstract A vegetation / atmosphere radiative transfer method is employed to study atmospheric effects in spectral vegetation indices. A one-dimensional turbid medium model of a vegetation canopy that includes specular reflection and the hot spot effect is used to calculate canopy bidirectional reflectance factors.
R.B Myneni, G Asrar
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Functional equivalence of spectral vegetation indices

Remote Sensing of Environment, 1984
Abstract Numerous formulae, vegetation indices, have been developed to reduce multispectral scanner (MSS) data to a single number for assessing vegetation characteristics such as species, leaf area, stress, and biomass. Part I of this report gives the history and formulae of some four dozen vegetation indices.
Charles R. Perry, Lyle F. Lautenschlager
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Spectral quality indicators for hyperspectral data

2011 3rd Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS), 2011
A novel approach to estimating at-sensor hyperspectral (HRS) data quality Q/A of Q/I is proposed. As the HRS sensor's performance may vary in time and space, a method to assess at-sensor radiance values is necessary. In fact, vicarious calibration solutions usually rely on natural, well-known, bright and dark targets that are large in size and ...
Anna Brook, Eyal Ben Dor
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ADIABATIC SPECTRAL FLOW AND CHANGE OF MORSE INDICES

Modern Physics Letters A, 1994
The concept of the Morse index characterizes the behavior near the critical points of the action functional that governs physical systems. We study the specific feature of Morse indices for the case that there are several number of critical points; on each of these critical points the Morse indices are defined.
Ono, Hideki, Kuratsuji, Hiroshi
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Polarization - Spectral Indication of the Objects

2007 International Kharkiv Symposium Physics and Engrg. of Millimeter and Sub-Millimeter Waves (MSMW), 2007
The experimental study of the features of the polarization-spectral structure of the signals scattered from the sea surface, hydrometeors, lots covered of flora and above - sea objects allowed to ascertain that for the acquiring signals of the object the appreciably high level of the correlation at orthogonal polarizations than for the noise is typical.
V.I. Lutsenko, I.V. Popov
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Spectral indices for estimating ecological indicators of karst rocky desertification

International Journal of Remote Sensing, 2010
Karst rocky desertification is a process of land desertification associated with human disturbance of the fragile eco-geological setting of karst ecosystems. The fractional cover of photosynthetic vegetation (PV), non-photosynthetic vegetation (NPV), bare soil and exposed bedrock are key ecological indicators of the extent and degree of land ...
Yuemin Yue, Bing Zhang, Kelin Wang, Bo Liu, Ru Li, Quanjun Jiao, Qingqing Yang, Mingyang Zhang   +7 more
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Spectral Classification and Multiband Colour Indices

1977
P.C. Keenan (U.S.A.) discussed his revised spectral classification for the cooler stars, based on the original MK system with the addition of abundance indices for stars which differ from the sun in composition. The system is defined and illustrated in a forthcoming photographic atlas.
Edith A. Müller, Arnost Jappel
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Spectral entropy as a flow state indicator

International Journal of Heat and Fluid Flow, 2017
Abstract In many practical applications, the flow state (laminar, transitional, turbulent) might vary in space and/or in time for a given configuration. The aim of the current study is to show that the spectral entropy Sd, obtained from solving the eigenvalue problem for the temporal autocorrelation function, can be used in order to uniquely quantify
Abouelmagd Abdelsamie, Gábor Janiga, Dominique Thévenin   +2 more
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