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Estimating sub-pixel surface roughness using remotely sensed stereoscopic data / A. Mushkin in Remote sensing of environment, vol 99 n° 1-2 (15 November 2005)
[article]
Titre : Estimating sub-pixel surface roughness using remotely sensed stereoscopic data Type de document : Article/Communication Auteurs : A. Mushkin, Auteur ; A.R. Gillepsie, Auteur Année de publication : 2005 Article en page(s) : pp 75 - 83 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse infrapixellaire
[Termes IGN] Californie (Etats-Unis)
[Termes IGN] désert
[Termes IGN] image Terra-ASTER
[Termes IGN] Israël
[Termes IGN] modèle stéréoscopique
[Termes IGN] ombre
[Termes IGN] radiance
[Termes IGN] rugosité du solRésumé : (Auteur) Surface roughness at the scale of 10-2-10-1 m can be estimated using the ratio (RR) between surface-reflected solar radiance measured from two view angles at nearly the same time. As RR is primarily a function of the difference between effective sub-pixel shading observed from the two view-angles, the divergence from unity RR values, which are expected for smooth Lambertian surfaces (they have no shadows), was found to be proportional to roughness at the 10-2-10-1 m scale of geomorphic desert surfaces. Ground-based RR values at 1-m resolution, as well as remotely acquired RR values at 4-, 15- and 50-m resolutions, were compared with observed surface roughness in two hyperarid test sites, located in Death Valley, California, USA and the southem Negev Desert in Israel. The ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) 15-m stereoscopic capability is identified as an effective resource for obtaining relative subpixel surface-roughness estimates that are largely independent of surface composition and relatively insensitive to atmospheric effects. Numéro de notice : A2005-441 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2005.02.018 En ligne : https://doi.org/10.1016/j.rse.2005.02.018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27577
in Remote sensing of environment > vol 99 n° 1-2 (15 November 2005) . - pp 75 - 83[article]Visualization of the spatial patterns of inter-urban income disparities using coordinate transformations / R. Gluhih in International journal of geographical information science IJGIS, vol 18 n° 3 (april - may 2004)
[article]
Titre : Visualization of the spatial patterns of inter-urban income disparities using coordinate transformations Type de document : Article/Communication Auteurs : R. Gluhih, Auteur ; B.A. Portnov, Auteur Année de publication : 2004 Article en page(s) : pp 281 - 297 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique
[Termes IGN] carte thématique
[Termes IGN] disparité
[Termes IGN] Israël
[Termes IGN] milieu urbain
[Termes IGN] revenu
[Termes IGN] transformation de coordonnées
[Termes IGN] urbanisation
[Termes IGN] ville
[Termes IGN] visualisationRésumé : (Auteur) Inter-urban income disparities reflect differences between individual urban localities in the average incomes of their residents. The present paper discusses different ways of visualizing such disparities on thematic maps. The approach we propose is based on the transformation of distances between individual localities and a reference city (e.g. a major population centre of a country) in proportion to the actual differences in the income levels. The general principle of such a transformation is to bring closer to the reference city places with higher incomes, while moving away localities with low income levels. Three alternative approaches to the implementation of this transformation technique are discussed. According to the 'actual distance' method, the spatial 'shift' of a locality on the map is set proportional to both the relative difference in incomes and the aerial distance between a locality and the reference city. In the 'proportional increment' transformation, the distance between a locality and the reference city is adjusted by a parameter whose values are proportional to income disparities between the two. Lastly, according to the 'concentric circle' transformation, localities with identical levels of incomes are positioned at a certain distance from the reference city, forming concentric circles around it. Both advantages and disadvantages of these transformation techniques are discussed, and the 'proportional increment' method is chosen as the best-performing visualization technique. The performance of this technique is demonstrated using income data for urban localities in Israel in 1991 and 1999. As analysis indicates, the proposed method helps to illustrate both the existing patterns of inter-urban income disparities and their dynamics over time. Numéro de notice : A2004-161 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810310001620951 En ligne : https://doi.org/10.1080/13658810310001620951 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26688
in International journal of geographical information science IJGIS > vol 18 n° 3 (april - may 2004) . - pp 281 - 297[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-04031 RAB Revue Centre de documentation En réserve L003 Disponible 079-04032 RAB Revue Centre de documentation En réserve L003 Disponible A hemispherical-directional reflectance model as a tool for understanding image distinctions between cultivated and uncultivated bare surfaces / J. Cierniewski in Remote sensing of environment, vol 90 n° 4 (30/04/2004)
[article]
Titre : A hemispherical-directional reflectance model as a tool for understanding image distinctions between cultivated and uncultivated bare surfaces Type de document : Article/Communication Auteurs : J. Cierniewski, Auteur ; T. Gdala, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 505 - 523 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] éclairement lumineux
[Termes IGN] Israël
[Termes IGN] loess
[Termes IGN] photo-identification
[Termes IGN] réflectance de surface
[Termes IGN] réflectance directionnelle
[Termes IGN] réflectance du sol
[Termes IGN] rocher
[Termes IGN] sol nu
[Termes IGN] surface cultivéeRésumé : (Auteur) This paper discusses a model to predict the normalized hemispherical -directional reflectance function for soil or rocky surfaces of a given roughness under conditions of outdoor illumination. These surfaces are simulated by geometrical shapes similar to beads merging into each other, characterized by three parameters. In addition, the shape of the surface is characterized by the directivity factor DR, expressing the differences between the maximum and the minimum deviations of its height, calculated along all possible directions. The surface is illuminated by a hemispherical light source created by a number of point sources of given light intensities. The light energy is scattered from the surface, in accordance the quasi-Lambertian function. The distribution of the surface reflectance, as viewed from all the possible directions, can be described for all the possible illumination conditions expressed by the solar zenith and the horizontal angles for a given hemisphere light distribution of a definite optical thickness. This represents the hemispherical -directional reflectance distribution function, HDRDF, of the surface. The HDRDF function is normalized to the nadir viewpoint and visualized for a given illumination condition. The model assumes that the HDRDF of a surface contains information about the directivity of the surface shape, as described by the directivity factor of the surface hemispherical -directional reflectance function DHDRDF. This factor, expressing the asymmetry of the HDRDF with respect to the solar principal plane (SPP), is strongly correlated with the DR. The use of both factors, the DR and DHDRDF, enables us to understand the distinctions between soil surface images with height irregularities of directional character that create a furrow microrelief, and irregularities spread non-directly, randomly, depending on whether the soil has been cultivated or not. The model was tested on directional reflectance data measured in the visible, the near and the middle infrared spectra for cultivated surface with furrows, as well as for three uncultivated desert loess and rocky surfaces situated in Israel. Numéro de notice : A2004-192 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.01.004 En ligne : https://doi.org/10.1016/j.rse.2004.01.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26719
in Remote sensing of environment > vol 90 n° 4 (30/04/2004) . - pp 505 - 523[article]Topographic information of sand dunes as extracted from shading effects using Landsat images / N. Levin in Remote sensing of environment, vol 90 n° 2 (30/03/2004)
[article]
Titre : Topographic information of sand dunes as extracted from shading effects using Landsat images Type de document : Article/Communication Auteurs : N. Levin, Auteur ; Eyal Ben-Dor, Auteur ; A. Karnieli, Auteur Année de publication : 2004 Article en page(s) : pp 190 - 209 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] analyse comparative
[Termes IGN] angle azimutal
[Termes IGN] appariement d'histogramme
[Termes IGN] dénivelée
[Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF
[Termes IGN] dune
[Termes IGN] extraction du relief
[Termes IGN] image Landsat-ETM+
[Termes IGN] image Landsat-TM
[Termes IGN] image multitemporelle
[Termes IGN] image Terra-ASTER
[Termes IGN] Israël
[Termes IGN] ombre
[Termes IGN] pente
[Termes IGN] réflectanceRésumé : (Auteur) Topographic variations affect the reflectance properties of the Earth's surface and are often removed in remote sensing studies. especially when significant terrain variations exist. In this study, however, we show that shading effects assessed by Landsat can be treated as a signal that stores important topographic information, especially when the spectral characteristics of a surface are homogenous. The coastal transverse dunes of the Ashdod area, and the desert linear dunes of Nizzana (both located in Israel), were selected to investigate the above-mentioned idea. The dune heights in these areas are 10 m on average (relative to their surroundings) and have maximum slopes of 33°. An innovative method for extracting slope, aspect, and height data for sand dunes using Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) images was developed, based on the regularity and periodicity of dunes landscapes. Using two Landsat images representing different sun zenith and azimuth angles, reflectance values of each image were converted to cos(i) values (i =incident angle between the surface normal and the solar beam radiation), applying histogram matching methods. The slope and aspect of each pixel were determined as those that give the best prediction of the observed value of cos(i). Height profiles were then extracted, using simple trigonometric relationships. The accuracies of heights and slopes along selected profile lines were to the order of 1 m and 3°, respectively (at a spatial resolution of 15 m). Best results were obtained when the images included one from the summer and the other from the winter, corresponding to maximum difference in solar zenith and azimuth angles. Errors in heights were attributed to surface heterogeneity (e.g., presence of biogenic soil crusts in the rainy season), geometric correction errors, cast shadows, and Bidirectional Reflectance Distribution Function (BRDF) effects. Comparison to Advanced Thermal Emission and Reflection Radiometer (ASTER) 3D information showed that the proposed method is better in representing the topographic variation of the area than the digital elevation model (DEM) produced by ASTER. Numéro de notice : A2004-141 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2003.12.008 En ligne : https://doi.org/10.1016/j.rse.2003.12.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26668
in Remote sensing of environment > vol 90 n° 2 (30/03/2004) . - pp 190 - 209[article]High-resolution imaging from space: a world-wide survey (part 2 Asia) / Gordon Petrie in Geoinformatics, vol 7 n° 2 (01/03/2004)
[article]
Titre : High-resolution imaging from space: a world-wide survey (part 2 Asia) Type de document : Article/Communication Auteurs : Gordon Petrie, Auteur Année de publication : 2004 Article en page(s) : pp 22 - 27 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] ADEOS
[Termes IGN] ALOS
[Termes IGN] Corée du sud
[Termes IGN] EROS
[Termes IGN] Inde
[Termes IGN] IRS
[Termes IGN] Israël
[Termes IGN] Japon
[Termes IGN] KOMPSAT
[Termes IGN] ROCSAT
[Termes IGN] satellite d'observation de la Terre
[Termes IGN] Taïwan
[Termes IGN] TESRésumé : (Auteur) Asia is an area where currently there is a huge activity in terms of building and launching satellites with a high-resotution imaging capabitity. Already six high-resolution satellites have been built in Asiatic countries and are operational, including two each from Israel, India and Japan. Another high-resotution satellite belonging to Taiwan is due to be launched within the next month or so. A further five are scheduled to be launched within the period 2004-2005 and still more are planned to be orbited during the rest of the decade. As will be seen, the vast majority of these satellites are being launched with national security considerations in mind. Numéro de notice : A2004-547 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27063
in Geoinformatics > vol 7 n° 2 (01/03/2004) . - pp 22 - 27[article]Voir aussi
- High-resolution imaging from space: a world-wide survey (part 1 North America) / Gordon Petrie in Geoinformatics, vol 7 n° 1 (01/01/2004)
- High-resolution imaging from space: a world-wide survey (part 3 Europe and part 4 ISS [international space station]) / Gordon Petrie in Geoinformatics, vol 7 n° 3 (01/04/2004)
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