Photogrammetric Engineering & Remote Sensing, PERS / American society for photogrammetry and remote sensing . vol 69 n° 7Paru le : 01/07/2003 |
[n° ou bulletin]
est un bulletin de Photogrammetric Engineering & Remote Sensing, PERS / American society for photogrammetry and remote sensing (1975 -)
[n° ou bulletin]
|
Dépouillements
Ajouter le résultat dans votre panierA fast algorithm for approximate viewshed computation / D. Izraelevitz in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 7 (July 2003)
[article]
Titre : A fast algorithm for approximate viewshed computation Type de document : Article/Communication Auteurs : D. Izraelevitz, Auteur Année de publication : 2003 Article en page(s) : pp 767 - 774 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] ligne de visée
[Termes IGN] modèle numérique de surface
[Termes IGN] paysage
[Termes IGN] traitement de donnéesRésumé : (Auteur) Given a terrain model, the viewshed from a viewpoint is computed as the set of X-Y positions of a point target such that the target is visible. We introduce a novel approach to the computation of accurate viewshed approximations. Our algorithm relies on the computation of an approximation to the so-called line-of-sight (LOS) function. This function is defined over target X-Y positions, and is the highest elevation of a target so that it is still occluded from the viewpoint. The LOS function summarizes intervisibility information and permits reuse of previous intervisibility computations, resulting in computational efficiencies, Our algorithm gives results very close to the traditional sightline ray method at a substantially smaller compututional cost, and is a generalization of the approach developed by Franklin and Ray for the same problem. We describe in detail the application to gridded terrain models, but the approach is similarly applicable to other elevation models. Numéro de notice : A2003-152 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.7.767 En ligne : https://doi.org/10.14358/PERS.69.7.767 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22448
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 7 (July 2003) . - pp 767 - 774[article]Urban subsidence monitoring using radar interferometry: algorithms and validation / M. Crosetto in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 7 (July 2003)
[article]
Titre : Urban subsidence monitoring using radar interferometry: algorithms and validation Type de document : Article/Communication Auteurs : M. Crosetto, Auteur ; M. Castillo, Auteur ; Roman Arbiol, Auteur Année de publication : 2003 Article en page(s) : pp 775 - 783 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] Catalogne (Espagne)
[Termes IGN] déformation de la croute terrestre
[Termes IGN] image radar moirée
[Termes IGN] interferométrie différentielle
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] milieu urbain
[Termes IGN] modèle géométrique de prise de vue
[Termes IGN] petite échelle
[Termes IGN] point d'appui
[Termes IGN] risque naturel
[Termes IGN] subsidence
[Termes IGN] surveillance géologiqueRésumé : (Auteur) The differential interferometric SAR (DInSAR) technique has proved its capability to detect small surface deformations in several types of applications. In this paper, its use as a quantitative subsidence monitoring tool is addressed to. A complete procedure is described, giving emphasis to the algorithms that have a major impact on the quality of the DInSAR results : the calibration of the InSAR geometry based on ground control points, which guarantees a high accuracy of the InSAR geometric model ; a filtering procedure suitable to reduce the atmospheric effects in small-scale subsidences; and a data fusion procedure for multiple observations, which represents a key step to improve the quality of the DInSAR products. The procedure was used in the analysis of a small-scale urban subsidence located in Catalonia, northeastern Spain. The validation of the results, which was based on the comparison with precise and independent reference data, is discussed in detail. Numéro de notice : A2003-153 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.7.775 En ligne : https://doi.org/10.14358/PERS.69.7.775 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22449
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 7 (July 2003) . - pp 775 - 783[article]Impact of topographic normalization on land-cover classification accuracy / S.R. Hale in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 7 (July 2003)
[article]
Titre : Impact of topographic normalization on land-cover classification accuracy Type de document : Article/Communication Auteurs : S.R. Hale, Auteur ; B.N. Rock, Auteur Année de publication : 2003 Article en page(s) : pp 785 - 791 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] classification dirigée
[Termes IGN] image Landsat-ETM+
[Termes IGN] modèle numérique de terrain
[Termes IGN] occupation du sol
[Termes IGN] précision de la classificationRésumé : (Auteur) For pixel classifying algorithms to perform effectively, effects of topographic relief must be minimized or removed. In areas of high topographic relief, problems arise when spectral variations in ground target illumination and radiance, owing to differences in incident radiation and nonLambertian reflectance behavior, respectively, cause identical landcover types to reflect differently, or different cover types to reflect similarly. A Landsat Enhanced Thematic Mapper image was processed using band ratios, the Minnaert Correction, aspect partitioning, and combinations of these treatments to generate independent landcover classifications. Treatment classification accuracy was determined using error matrices and the Kappa statistic. Producer's and User's Accuracies were examined to determine if treatments were superior at producing greater class specific accuracy. None of the treatments produced a significantly more accurate classification; however, assessment of classspecific accuracies indicated accuracy gains using aspect partitioning alone or in combination with the Minnaert Correction. Numéro de notice : A2003-154 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.7.785 En ligne : https://doi.org/10.14358/PERS.69.7.785 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22450
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 7 (July 2003) . - pp 785 - 791[article]Land-cover change monitoring with classification trees using Landsat TM and ancillary data / J. Rogan in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 7 (July 2003)
[article]
Titre : Land-cover change monitoring with classification trees using Landsat TM and ancillary data Type de document : Article/Communication Auteurs : J. Rogan, Auteur ; D. Stow, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 793 - 804 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] classification ascendante hiérarchique
[Termes IGN] couvert végétal
[Termes IGN] détection de changement
[Termes IGN] données auxiliaires
[Termes IGN] flore locale
[Termes IGN] image Landsat-TM
[Termes IGN] occupation du sol
[Termes IGN] San DiegoRésumé : (Auteur) We monitored land-cover change in San Diego County (1990-1996) using multitemporal Landsat TM data. Change vectors of Knuth Thomas features were combined with stable multitemporal Knuth Thomas features and a suite of ancillary variables within a classification tree classifier. A combination of aerial photo-interpretation and field measurements yielded training and validation data. Maps of land-cover change were generated for three hierarchical levels of change classification of increasing detail: change vs. no-change; four classes representing broad increase and decrease classes; and nine classes distinguishing increases or decreases in tree canopy cover, shrub cover, and urban change, The multitemporal Kauth Thomas (both stable and change features representing brightness, greenness, and wetness) provided information for magnitude and direction of land-cover change. Overall accuracies of the land-cover change maps were high (72 to 92 percent). Ancillary variables representing elevation, fire history, and slope were most significant in mapping the most complicated level of land-cover change, contributing 15 percent to overall accuracy. Glassification trees have not previously been used operationally with -remotely sensed and ancillary data to map land-cover change at this level of thematic detail. Numéro de notice : A2003-155 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.7.793 En ligne : https://doi.org/10.14358/PERS.69.7.793 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22451
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 7 (July 2003) . - pp 793 - 804[article]Settlement design, forest fragmentation, and landscape change in Rondônia, Amazonia / M. Batistella in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 7 (July 2003)
[article]
Titre : Settlement design, forest fragmentation, and landscape change in Rondônia, Amazonia Type de document : Article/Communication Auteurs : M. Batistella, Auteur ; S. Robeson, Auteur ; E.F. Moran, Auteur Année de publication : 2003 Article en page(s) : pp 805 - 812 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Amazonie
[Termes IGN] analyse diachronique
[Termes IGN] Brésil
[Termes IGN] déboisement
[Termes IGN] détection de changement
[Termes IGN] écologie
[Termes IGN] écosystème
[Termes IGN] image Landsat-TMRésumé : (Auteur) Deforestation and colonization in Amazonia have attracted substantial attention. This article focuses on an area of 3,000 km within the Brazilian State of Rondonia. Two adjacent settlements were compared to assess the role of their different designs in landscape change. Anari was planned following an orthogonal road network. Machadinho was designed with attention to topography in laying out roads and farm properties, while including communal reserves. Field research was undertaken in conjunction with multi-temporal classifications of remotely sensed data (1988, 1994, and 1998) and landscape ecology methods. The results indicate that large patches of communal reserves play an important role in maintaining lower levels of fragmentation. Analyses of landscape structure confirmed that forest patches in Machadinho are less fragmented, more complex, and preserve more interior habitat. By comparing the effects of different settlement designs on landscape change and forest fragmentation, this article contributes to the debate about colonization strategies in Amazonia. Numéro de notice : A2003-156 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.69.7.805 En ligne : https://doi.org/10.14358/PERS.69.7.805 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22452
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 7 (July 2003) . - pp 805 - 812[article]