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Geoscience and Remote Sensing Symposium, 1993. IGARSS '93. Better Understanding of Earth Environment., International

18-21 Aug. 1993

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Displaying Results 1 - 25 of 618
  • A simple cleaning procedure for improvement of training site statistics

    Publication Year: 1993, Page(s):2102 - 2104 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (185 KB)

    For improving the effectiveness of supervised training, a cleaning procedure which operates by selectively dropping training site pixels based on the Mahalanobis distance and class probability has been proposed. The method is iterative and takes into account the spectral overlap in all image hands. The procedure results in greater classification accuracy with a narrower confidence interval. The Bh... View full abstract»

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  • Preprocessing of multifrequency SAR images: application to geological study of karstic formations (Le Larzac-France)

    Publication Year: 1993, Page(s):2135 - 2137 vol.4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (543 KB)

    The usefulness of SAR images to detect geological features has been widely demonstrated by numerous studies. Nevertheless, when applied to SAR images, lithologies classification algorithms and pattern recognition tools intended for the extraction of features of interest are often unable to separate correctly actual geological features from artefacts due to speckle microtexture. The objective of th... View full abstract»

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  • Proceedings of IGARSS '93 - IEEE International Geoscience and Remote Sensing Symposium

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (866 KB)
    Freely Available from IEEE
  • Partially supervised classification with optimal significance testing

    Publication Year: 1993, Page(s):1370 - 1372 vol.3
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The paper addresses the problem of estimating an optimal acceptance probability to be used for significance testing as applied to partially supervised classification where the class definition and corresponding training samples are provided a priori only for one specific class of interest. Considering the effort in both time and man-power required for a well-defined, exhaustive list of classes wit... View full abstract»

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  • Modeling of three-dimensional magnetic fields of magnetized bodies

    Publication Year: 1993, Page(s):1373 - 1375 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Motivated by the growing importance of deposit explorations, the modeling of magnetic fields of permanent magnets and magnetic circuits, an algorithm is presented which allows one to compute efficiently the magnetic field components of magnetized three dimensional bodies. The algorithm is able to take homogeneous and inhomogeneous magnetization into account View full abstract»

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  • Pre- and after-sign detection of earthquake through ELF radiation

    Publication Year: 1993, Page(s):1376 - 1381 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A highly sensitive geomagnetic field detection system of order 0.01 pT at the ELF frequency of 225 Hz has been developed and set up in Ito city, Shizuoka prefecture, over four years and at Mt. Fugen, Nagasaki prefecture, over two years. From the ground ELF radiation, the authors detected precursors and after-signs of the advent of the tenth and eleventh lava domes and further even precursors of th... View full abstract»

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  • The three-dimensional structure of cumulus clouds over the ocean

    Publication Year: 1993, Page(s):1482 - 1484 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Thermal channel (channel 6, 10.4-12.5 μm) images of five LANDSAT Thematic Mapper (TM) cumulus scenes over the ocean are examined. A technique is developed to recognize individual cells within a cloud. It is found that unicellular clouds are generally smaller (⩽1 km) and have smaller fractal dimensions, while multicellular clouds are larger (⩾1 km) and have larger fractal dimensions, cel... View full abstract»

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  • Directional distribution of wind vectors observed by ERS-1/AMI scatterometer

    Publication Year: 1993, Page(s):1385 - 1387 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The frequency distribution of the wind directions observed by the ERS-1/AMI scatterometer is investigated to examine the effects of errors in the model function used to retrieve the wind vectors from backscattering measurements. It is found that scatterometer-derived wind vectors have some directivity relative to the antenna beams. This directivity is related to errors in the model function used t... View full abstract»

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  • The United Nations Environment Programme's (UNEP) global resource information database

    Publication Year: 1993, Page(s):1677 - 1678 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    Since the United Nations Environment Program (UNEP) was established in 1972. The world has seen an ever increasing need from decision makers, resource managers, school children, media and the public for getting access to information about the state of the global environment. To improve on this situation UNEP established the Global Resource Information Database GRID in 1985. GRID's main objective i... View full abstract»

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  • Critical review of aerosol optical thickness estimation with satellite data

    Publication Year: 1993, Page(s):1479 - 1481 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    With a data set of aerosol optical thickness derived from ground sunphotometers measurements on some sites in West Africa, the author evaluates some models devoted to the retrieval of aerosol optical thickness from remotely sensed radiances. This evaluation focuses on the potential of the satellite data for the monitoring of the aerosol optical thickness over land and sea on a global or at least r... View full abstract»

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  • Analysis of wind and wave fields associated with low pressure systems, using ERS-1 altimeter and scatterometer data

    Publication Year: 1993, Page(s):1388 - 1390 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The effect of surface waves on the momentum, latent and specific heat for the development of an atmospheric depression is a subject of major concern. Low pressure systems are associated with large gradients of wind speed and sea state, and therefore large gradient of surface fluxes. Because of the sparsity of the in situ data at sea, the spatial distribution of surface winds and sea-states is not ... View full abstract»

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  • Improvement in the accuracy of paddy field area estimation using the area ratio of each pixel derived from Landsat TM data

    Publication Year: 1993, Page(s):1699 - 1700 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    It is important to estimate paddy field areas accurately in order to evaluate the production of rice and the the emission flux of the greenhouse gas “methane”. Accordingly, the authors developed a method to estimate the area of paddy fields in pixels from the CCT count of the Landsat TM data. The authors applied their method to 8 cities and towns located in Ishikari plain of Hokkaido a... View full abstract»

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  • Remote sensing of surface sensible and latent heat fluxes

    Publication Year: 1993, Page(s):1476 - 1478 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    The potential for radar/lidar remote sensing of the surface sensible and latent heat fluxes is discussed, and some preliminary results are given. The method utilizes a parameterization scheme involving observables measured by radar/lidar in the convective boundary layer View full abstract»

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  • A ERS-1 scatterometer wind vector model function based on buoys data

    Publication Year: 1993
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (32 KB)

    Norwegian Sea buoy observations are used to validate the ERS-1 satellite radar remote sensing method. The buoy observations were made between October 1991 and February 1992. Mesoscale wind fields from the Norwegian Meteorological Institute have been used for validation of the scatterometer winds. The second source of in-situ data used is the network of NOAA buoys near the USA east and west coasts.... View full abstract»

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  • Analysis and simulation for a spotlight-mode aircraft SAR in circular flight path

    Publication Year: 1993, Page(s):1777 - 1780 vol.4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A spotlight-mode aircraft SAR in a circular flight path can efficiently obtain an image with very high azimuth resolution or a wider azimuth viewing angle. An analysis of this spotlight-mode SAR is made regarding the required PRF, the predicted resolution, and the computation complexity as a function of the aircraft altitude and the distance between the target and the center of the flight path pro... View full abstract»

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  • On the application of land information system for the land management

    Publication Year: 1993, Page(s):924 - 926 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    The accuracy of data, the structure of the cross reference file of data and the perpetual preservation of data [Bmanagement through map computerization and the implementation of a database, when land and utility informations are computerized and databased on the computer by the land information system. It is shown that the general systems for the land management are inadequate in various contexts,... View full abstract»

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  • Real-time SAR activities at TNO Physics and Electronics Laboratory

    Publication Year: 1993, Page(s):1413 - 1415 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    At TNO Physics and Electronics Laboratory a novel algorithm has been developed for real-time SAR processing, it is referred to as the subband algorithm. The algorithm is based on the theory of multirate filter banks. From the subband algorithm a fast convolution algorithm and an autofocus algorithm are derived. Using the fast convolution algorithm a high performance hardware architecture for real-... View full abstract»

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  • Estimation of the air temperature over the ground using AVHRR/NOAA 11

    Publication Year: 1993, Page(s):1473 - 1475 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    Using locally received AVHRR thermal infrared data, the air-temperature (Ta) in Japan is estimated. The 566 coupled data sets of Ta at 1.5 m and AVHRR observation are produced. The truth data are classified into three groups (forest, fields, and city) according to the ground component, and the relation between the AVHRR temperature and the truth temperature is examined. Regression relations using ... View full abstract»

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  • Promising selection using factor approximate method in the remote sensing interpretation

    Publication Year: 1993, Page(s):2096 - 2098 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The information contained in remote sensing images is represented by various image signatures. How to analyse, extract and utilize these features to select a promising area is an important research subject in remote sensing geological interpretation. The paper discusses how to determine remote sensing interpretation factors based on the analysis of the metallogenetic mechanism and how to establish... View full abstract»

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  • Large scale radar signatures of the land surface measured by the ERS-1 scatterometer

    Publication Year: 1993, Page(s):1392 - 1394 vol.3
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A C-band scatterometer is presently flying aboard the First European Remote Sensing Satellite (ERS-1) which is capable of measuring the normalized radar cross section (NRCS) of the Earth's surface globally. The scatterometer data are primarily used for determining the surface wind over the ocean. Up to now, minor attention was given to the scatterometer data over land. In this investigation ERS-1 ... View full abstract»

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  • Comparing holographic synthetic aperture radar images obtained from multifacet computer models with chamber measurements

    Publication Year: 1993, Page(s):1781 - 1782 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    The Houston Advanced Research Center (HARC) has been working to bring together three areas of investigation to advance the understanding of the wave scattering process and extend the limits of image processing from received radar data. Those areas include real vegetation and computer modeling of various vegetation environments, constructing computer facet models of various objects of interest and ... View full abstract»

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  • Hyperspectral technology for geologic applications

    Publication Year: 1993, Page(s):917 - 920 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Hyperspectral radiometers were developed and flown in aircraft and spacecraft early in the decade of the 1980s. Laboratory, field and aircraft experiments with hyperspectral remote sensing instruments at moderate ground spatial resolutions during the decade of the 1980s have now established the basis for hyperspectral imaging spectrometers with ground spatial resolutions of 5 metres or better and ... View full abstract»

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  • A multi-sensor digital SAR processor for PC or workstation computer platforms

    Publication Year: 1993, Page(s):1410 - 1412 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    A new SAR digital processor has been designed and coded to process signal data acquired by the spaceborne JERS-1 (L band), EERS-1 (C band), and SEASAT (L band), as well as the airborne CCRS (C/X band) SAR sensors. Its features include: automatic configuration for standard products; users' flexibility for SAR research; range-Doppler algorithm with secondary range compression; resampling on complex ... View full abstract»

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  • Analysis of cloud optical thickness and effective radius retrievals for broken cloud fields

    Publication Year: 1993, Page(s):1470 - 1472 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Radiative transfer model results at two wavelengths (i.e., visible and near IR) can be applied to satellite imagery to infer optical properties of clouds. In this study, the authors examine several types of cloud fields to gain an understanding of the effect of broken cloudiness on cloud property retrievals. Reliable estimates of cloud properties can be obtained for large scale, stratiform cloud f... View full abstract»

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  • Monitoring the AVHRR calibration

    Publication Year: 1993, Page(s):885 - 887 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    Over the years growing consideration has been given to the use of remote sensing data to absolute calibration problems and gain drift monitoring. Although most of the satellites have on-board calibration devices, their use, especially in then shortwave bands, remains difficult because of their uncontrolled ageing. In order to solve such a problem, some experiments are periodically held to quantify... View full abstract»

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