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Proceedings of the IEEE

Issue 6 • Date June 1985

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Displaying Results 1 - 25 of 33
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1985, Page(s):947 - 949
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • Optical remote sensing of the earth

    Publication Year: 1985, Page(s):950 - 969
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2832 KB)

    Optical remote sensing of the earth from aircraft and from orbit has made unique contributions to understanding the dynamics of the atmosphere, oceans, and the vegetation cover of the land, as well as provided new perspectives in the study of the solid earth. This paper encompasses optical remote sensing of the earth's surface in the region of 0.4 to 15 µm and is divided into four areas: prin... View full abstract»

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  • Microwave remote sensing from space

    Publication Year: 1985, Page(s):970 - 996
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5305 KB)

    Spaceborne microwave remote sensors provide perspectives of the earth surface and atmosphere which are of unique value in scientific studies of geomorphology, oceanic waves and topography, atmospheric water vapor and temperatures, vegetation classification and stress, ice types and dynamics, and hydrological characteristics. Microwave radars and radiometers offer enhanced sensitivities to the geom... View full abstract»

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  • Radiometric considerations in remote sensing

    Publication Year: 1985, Page(s):997 - 1011
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1519 KB)

    The need for accurate radiometric data for the verification and use of scene radiation models is emphasized. The radiometric problems associated with reflectance and atmospheric correction field measurements and sensor calibration are reviewed. Estimates are made of the attainable accuracy in each case under favorable conditions. The loss in radiometric accuracy by resampling procedures in digital... View full abstract»

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  • Polarization of light scattered by vegetation

    Publication Year: 1985, Page(s):1012 - 1024
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1516 KB)

    The potential information in polarization data of both single leaves and plant canopies is investigated. Measurements demonstrate the relationship between polarization data and various optical and botanical properties of both pieces of foliage and plant canopies. The results provide a basis for gaining fundamental understanding of how light is scattered and polarized by a plant canopy. The results... View full abstract»

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  • Eos: The earth observing system of the 1990s

    Publication Year: 1985, Page(s):1025 - 1030
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    In this paper the recent considerations of NASA's Earth Observing System Science and Mission Requirements Working Group are summarized. The Working Group was chartered to consider the broad Earth Science objectives that could be addressed from a low-earth orbital perspective in the 1990s, together with consideration of the specific observations and instrument packages that would be needed to meet ... View full abstract»

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  • Advanced interpretation techniques for earth data information systems

    Publication Year: 1985, Page(s):1031 - 1039
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Advanced interpretation techniques used in remote sensing are surveyed in the context of earth data information systems. Included are methods for extracting information from the spectral, temporal, and spatial domains. The many types of data contained in modern earth data information systems constitute a generalized scene context which current research seeks to exploit more fully. Initial efforts ... View full abstract»

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  • Automatic inference of elevation and drainage models from a satellite image

    Publication Year: 1985, Page(s):1040 - 1053
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2756 KB)

    Oblique illumination of irregular topography generates a pattern of highlighting and shadow, as the solar beam directly illuminates those slopes that face the sun while those on opposite sides of ridgelines are shadowed. On remotely sensed images these patterns appear as alternating dark and bright regions that reveal approximate positions of ridges and valleys. Knowledge of scene-specific variabl... View full abstract»

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  • A hierarchical expert system for updating forestry maps with Landsat data

    Publication Year: 1985, Page(s):1054 - 1063
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1029 KB)

    This paper reports upon the design of an expert system at the Canada Centre for Remote Sensing for updating maps of forested areas using Landsat imagery. The system is decomposed into a number of specialist experts organized in a hierarchical fashion around a series of blackboards which are used for communications between the different levels. At the lowest level in the hierarchy, is an expert whi... View full abstract»

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  • Image processing on the IBM personal computer

    Publication Year: 1985, Page(s):1064 - 1070
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1043 KB)

    The Palo Alto Scientific Center has developed an experimental image processing system based upon the IBM Personal Computer. It provides a variety of commonly used image processing functions in an environment that connects the programs through a menu convenient for both casual and experienced users. The System is implemented using a compiled BASIC program coupled with assembly language subroutines.... View full abstract»

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  • Spectral inputs to crop identification and condition assessment

    Publication Year: 1985, Page(s):1071 - 1085
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1555 KB)

    This review discusses, from an agronomic perspective, contemporary remote sensing research on crop identification and condition assessment. The paper begins with a review of the basic relationships of reflectance and biophysical properties of crop canopies. Leaf area index is shown to be a key parameter linking multispectral reflectance and crop physiology. Major advancements in capability, partic... View full abstract»

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  • Evaluating evapotranspiration at local and regional scales

    Publication Year: 1985, Page(s):1086 - 1096
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1023 KB)

    Combining remotely sensed data with ground-based meteorological data allows the evaluation of evapotranspiration (the evaporation of water from soil and plant surfaces) at local and regional scales. Remote sensors can provide information on reflected solar radiation and surface temperatures. The remaining variables in the energy balance equations must be measured at ground level, estimated, modele... View full abstract»

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  • Geographic applications of remotely sensed data

    Publication Year: 1985, Page(s):1097 - 1107
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1900 KB)

    The application of remote sensing to the study of geography as spatially distributed phenomena began in the late 1800s when German foresters used photography taken from a balloon to produce forest maps. Since this early beginning researchers and professionals in government, industry, and educational institutions have become increasingly aware of the ability of remote sensing to provide geographic ... View full abstract»

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  • Evaluation of Landsat thematic mapper imagery for geologic applications

    Publication Year: 1985, Page(s):1108 - 1117
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2082 KB)

    Landsat-4 Thematic Mapper (TM) imagery were enhanced and evaluated for geologic applications in both heavily and sparsely vegetated areas of the San Francisco Bay Region. False color composites of contrast-stretched spectral bands and principal component combinations were found to provide the most lithologic and structural information for geologic interpretation. The 30-m spatial resolution and se... View full abstract»

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  • Earth system science and remote sensing

    Publication Year: 1985, Page(s):1118 - 1127
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1119 KB)

    A conceptual model is presented of the Earth System appropriate to global change on timescales of decades to centuries. This is used as a framework for discussion of the processes and feedbacks involved in the physical climate system and in biogeochemical cycles, and the expected role of remote sensing in understanding them. Demonstrated and potential opportunities for space-related observations a... View full abstract»

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  • Realizations of two-parameter functions using Markov parameters and moments

    Publication Year: 1985, Page(s):1134 - 1135
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (181 KB)

    An algorithm for determining a minimal state variable realization for two-variable transfer functions using a combination of newly defined Markov parameters and moments of impulse response matrix has been described. View full abstract»

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  • Explicit formula for the coefficients of maximally flat nonrecursive digital filter transfer functions expressed in powers of cos w

    Publication Year: 1985, Page(s):1135 - 1137
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    An explicit formula for the coefficients of the transfer function of a maximally flat nonrecursive digital filter, expressed in powers of cos w, is derived by exploiting the properties of the Kaiser-Hamming [1] amplitude change function polynomial. Transfer functions expressed in this form are convenient for implementing variable cutoff filters [2]. View full abstract»

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  • A frequency-weighted block LMS algorithm and its application to speech processing

    Publication Year: 1985, Page(s):1137 - 1138
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (197 KB)

    In this letter, we propose a frequency-weighted block LMS (FWBLMS) algorithm that is based on minimization of the frequency-weighted block mean-squared error. The FWBLMS algorithm has an important advantage over the time-domain LMS algorithm in that it can be designed with different frequency weighting on error signal depending on the relative significance of various frequency bands. Application o... View full abstract»

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  • The observation of individual natural-frequency resonances of radar targets through the scattering of long pulses

    Publication Year: 1985, Page(s):1138 - 1140
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (301 KB)

    The Singularity Expansion Method has shown the transient echo amplitude of radar targets to be characterized by complex-frequency poles and their residues. We note that the use of pulsed signals of long duration permits identification of individual pole resonances by the observation of their ringing. View full abstract»

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  • Iterative reconstruction-reprojection in projection space

    Publication Year: 1985, Page(s):1140 - 1141
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    An iterative reconstruction-reprojection in projection space (IRRP) algorithm is proposed to eliminate the interpolation errors of iterative reconstruction-reprojection (IRR) algorithm in computed tomography (CT). Through computer simulations, IRRP is shown to have better convergence for the limited view problems. View full abstract»

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  • An upper bound on run-length coding entropy

    Publication Year: 1985, Page(s):1141 - 1142
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    A method of calculating the maximum entropy per run in binary run-length coding is given when run length is limited to a maximum of M. It is also shown that Huang's bound [1] can be obtained from the present result as M tends to infinity. View full abstract»

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  • A boolean content addressable memory and its applications

    Publication Year: 1985, Page(s):1142 - 1144
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A memory called the Boolean Content Addressable Memory integrates the content-based address identification logic into the RAM comprising 1-bit words. This memory is suitable for on-chip VLSI implementation and compatible with the RAM for on-board implementation. Its application includes list management and graph traversal. View full abstract»

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  • Comment on "Digital optical computing"

    Publication Year: 1985, Page(s): 1144
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  • Simultaneous resolution of unambiguous range and doppler in a pulse-doppler radar using multiple PRFs

    Publication Year: 1985, Page(s):1144 - 1145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB)

    A method of simultaneously resolving both range and doppler ambiguities in a pulse-doppler radar is presented. The improvements over previous techniques are that only two PRFs are required and that the same number of doppler filters in each PRF is permitted. View full abstract»

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North Carolina State University