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Delineating lakes and enclosed islands in satellite imagery by geodesic active contour model / C. Shen in International Journal of Remote Sensing IJRS, vol 27 n°23-24 (December 2006)
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Titre : Delineating lakes and enclosed islands in satellite imagery by geodesic active contour model Type de document : Article/Communication Auteurs : C. Shen, Auteur ; J. Fan, Auteur ; F. Li, Auteur Année de publication : 2006 Article en page(s) : pp 5253 - 5268 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] calcul différentiel
[Termes IGN] Chine
[Termes IGN] classification non dirigée
[Termes IGN] couleur (variable spectrale)
[Termes IGN] détection de contours
[Termes IGN] image en couleur
[Termes IGN] image en couleur composée
[Termes IGN] image Landsat-ETM+
[Termes IGN] lac
[Termes IGN] MNS SRTM
[Termes IGN] modèle numérique de surfaceRésumé : (Auteur) The objective of the present paper is to develop a new method for delineating lakes and enclosed islands from shuttle radar topography mission (SRTM) digital elevation model (DEM). The Thousand-Island Lake in China is chosen as the study site. DEM may have missing values or be inaccurate over water bodies. Thus, it is not trivial to delineate the shorelines of lake directly from DEM. We achieve this objective by overlaying the boundary derived from the Landsat image of the same area. Unlike traditional water body delineation techniques, e.g. the band ratio method, which make use of physical quantities, we only use the colour information from Landsat ETM+ band 7, 4 and 2. The main reason is that the colour information is the only resource available for most publicly available satellite data such as the maps from Google Earth. Thus, it is necessary to develop a method depending on only colour information. In the Landsat image, a discrimination function to determine whether a pixel belongs to the lake area is obtained by studying sample pixels chosen from the lake area. The delineation of shorelines is an evolutionary process. The evolution equation is derived according to the active contour model and the discrimination function. The initial contour is inside the lake and expands according to the evolution equation. The evolving curve converges to the boundaries of the lake efficiently with a satisfactory result. Finally, the shorelines are overlaid on the DEM according to latitude and longitude. Our geodesic active contour method is a general one, and could be used to delineate objects of interest such as oil slicks and burn scars in satellite images. Copyright Taylor & Francis Numéro de notice : A2006-581 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600857444 En ligne : https://doi.org/10.1080/01431160600857444 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28304
in International Journal of Remote Sensing IJRS > vol 27 n°23-24 (December 2006) . - pp 5253 - 5268[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-06121 RAB Revue Centre de documentation En réserve L003 Disponible Evaluation of the horizontal resolution of SRTM elevation data / L. Pierce in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 11 (November 2006)
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Titre : Evaluation of the horizontal resolution of SRTM elevation data Type de document : Article/Communication Auteurs : L. Pierce, Auteur ; J. Kelindorf, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1235 - 1244 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie spatiale
[Termes IGN] lever topographique
[Termes IGN] limite de résolution géométrique
[Termes IGN] MNS SRTM
[Termes IGN] modèle numérique de surface
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] qualité géométrique (image)
[Termes IGN] raisonnement inductifRésumé : (Auteur) The SRTM dataset is available at the USGS seamless website with one arc-second pixel spacing for the U.S. Recently, the value for horizontal resolution has been questioned. One paper (Smith and Sandwell, 2003) suggests that 60 meters may be more accurate, implying that the resolution is twice the provided spacing. For users of this data, the horizontal resolution is very important for their analyses. Hence, this paper addresses this important question by using two different approaches: coherence spectra and step-response. The coherence spectra approach uses statistical techniques to compare the SRTM dataset against a more accurate one, while the step response approach uses the observed step response in many areas of the dataset to estimate the width of the averaging function used to produce the SRTM data. Results from this study show that the resolution is between 1 and 1.6 pixels, depending on the local variability of the elevation data; with higher resolution near sharp edges and corners, and lower resolution in smoother areas. Copyright ASPRS Numéro de notice : A2006-492 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.72.11.1235 En ligne : https://doi.org/10.14358/PERS.72.11.1235 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28216
in Photogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 11 (November 2006) . - pp 1235 - 1244[article]High-resolution land topography / Didier Massonnet in Comptes rendus : Géoscience, vol 338 n° 14-15 (November 2006)
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Titre : High-resolution land topography Titre original : Cartographie topographique à haute résolution Type de document : Article/Communication Auteurs : Didier Massonnet, Auteur ; Charles Elachi, Auteur Année de publication : 2006 Article en page(s) : pp 1029 - 1041 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] cartographie topographique
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] MNS SRTM
[Termes IGN] SRTMRésumé : (Auteur) Après avoir décrit le contexte, les méthodes de production et certains usages scientifiques des cartes topographiques à haute résolution, nous présentons la situation actuelle et les perspectives de l'interférométrie radar, considérée comme la meilleure solution en termes de compromis entre couverture globale et précision. Après une introduction sur les aspects théoriques de cette technique – principes, limites d'emploi et capacités variées –, nous développerons son application à la topographie dont a résulté la carte globale la plus précise à ce jour : la base de données SRTM. Après une présentation du système de roue interférométrique, nous nous appuierons sur ses performances attendues pour discuter des perspectives scientifiques d'une carte topographique globale, de précision meilleure que le mètre. Nous mentionnerons également les bénéfices que d'autres domaines de l'observation spatiale, tels que l'hydrologie, peuvent retirer des produits issus des systèmes d'interférométrie radar. Numéro de notice : A2006-646 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29468
in Comptes rendus : Géoscience > vol 338 n° 14-15 (November 2006) . - pp 1029 - 1041[article]Assessment of the processed SRTM-based elevation data by CGIAR using field from USA and Thailand and its relation to the terrain characteristics / Y. Gorokhovich in Remote sensing of environment, vol 104 n° 4 (30/10/2006)
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Titre : Assessment of the processed SRTM-based elevation data by CGIAR using field from USA and Thailand and its relation to the terrain characteristics Type de document : Article/Communication Auteurs : Y. Gorokhovich, Auteur ; A. Voustianiouk, Auteur Année de publication : 2006 Article en page(s) : pp 409 - 415 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse de données
[Termes IGN] MNS SRTM
[Termes IGN] modèle numérique de surface
[Termes IGN] New York (Etats-Unis ; état)
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] réalité de terrain
[Termes IGN] régression multiple
[Termes IGN] ThaïlandeRésumé : (Auteur) Shuttle radar topographic mission (SRTM) has created an unparalleled data set of global elevations that is freely available for modeling and environmental applications. The global availability (almost 80% of the Earth surface) of SRTM data provides baseline information for many types of the worldwide research. The processed SRTM 90 m digital elevation model (DEM) for the entire globe was compiled by Consultative Group for International Agriculture Research Consortium for Spatial Information (CGIAR-CSI) and made available to the public via internet mapping interface. This product presents a great value for scientists dealing with terrain analysis, thanks to its easy download procedure and ready-to-use format. However, overall assessment of the accuracy of this product requires additional regional studies involving ground truth control and accuracy verification methods with higher level of precision, such as the global positioning system (GPS).
The study presented in this paper is based on two independent datasets collected with the same GPS system in Catskill Mountains (New York, USA) and Phuket (Thailand). Both datasets were corrected with differential base station data. Statistical analysis included estimation of absolute errors and multiple regression analysis with slope and aspect variables. Data were analyzed for each location separately and in combination. Differences in terrain and geographical location allowed independent interpretation of results.
The results of this study showed that absolute average vertical errors from CGIAR dataset can range from 7.58 1 0.60 m in Phuket to 4.07 1 0.47 m in Catskills (mean 1 S.E.M.). This is significantly better than a standard SRTM accuracy value indicated in its specification (i.e. 16 m). The error values have strong correlation with slope and certain aspect values. Taking into account slope and aspect considerably improved the accuracy of the CGIAR DEM product for terrain with slope values greater than 10°; however, for the terrain with slope values less than 10°, this improvement was found to be negligible. Copyright ElsevierNuméro de notice : A2006-495 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.05.012 En ligne : https://doi.org/10.1016/j.rse.2006.05.012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28219
in Remote sensing of environment > vol 104 n° 4 (30/10/2006) . - pp 409 - 415[article]Extraction of ground control points (GCPs) from synthetic aperture radar images and SRTM DEM / S.H. Hong in International Journal of Remote Sensing IJRS, vol 27 n°18 - 19 - 20 (October 2006)
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Titre : Extraction of ground control points (GCPs) from synthetic aperture radar images and SRTM DEM Type de document : Article/Communication Auteurs : S.H. Hong, Auteur ; Hyung-Sup Jung, Auteur ; J.S. Won, Auteur Année de publication : 2006 Article en page(s) : pp 3813 - 3829 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] écart type
[Termes IGN] extraction
[Termes IGN] image ERS-SAR
[Termes IGN] image IRS
[Termes IGN] MNS SRTM
[Termes IGN] modèle numérique de surface
[Termes IGN] point d'appui
[Termes IGN] radargrammétrieRésumé : (Auteur) Qualified ground control points (GCPs) are crucial in the geolocation of a remotely sensed image. If a region has no published map, the geographical coordinates of GCPs must be obtained indirectly. Although these can be re-constructed from a synthetic aperture radar (SAR) image using sensor position and velocity, this conventional method does not provide accurate GCPs owing to the variable elevations of actual topography. We propose an inverse geolocation method for GCPs by SAR simulation. This improves the accuracy of extracted GCPs by accommodating topographic effects, and requires a high-resolution digital elevation model (DEM) and SAR with precise orbit data. The errors in the northing derive mainly from the imaging pulse time, and were improved by applying an azimuth time correction. In this study ERS SAR data with precise Delft orbit and shuttle radar topography mission (SRTM) DEM were used. Mean values for the planimetric distance error in the GCPs were 4.1 and 5.4 m with standard deviations of 10.6 and 16.9 m in northing and easting, respectively. The obtained GCPs were applied to an IRS image for geo-rectification, and the result was mean image positional errors of 3.6 and 2.7 m with standard deviations of 8.4 and 15.4 m in northing and easting, respectively. The root mean square errors are 9.0 and 15.3 m in northing and easting, respectively. Copyright Taylor & Francis Numéro de notice : A2006-457 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600658115 En ligne : https://doi.org/10.1080/01431160600658115 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28181
in International Journal of Remote Sensing IJRS > vol 27 n°18 - 19 - 20 (October 2006) . - pp 3813 - 3829[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-06101 RAB Revue Centre de documentation En réserve L003 Disponible Groundwater assessment through an integrated approach using remote sensing, GIS and resistivity techniques: a case study from a hard rock terrain / P.K. Srivastava in International Journal of Remote Sensing IJRS, vol 27 n°18 - 19 - 20 (October 2006)
PermalinkPhoto-interprétation du modèle numérique de terrain SRTM, pour l'étude des directions privilégiées de percolation (site de Bursa, Turquie) / F. Kaveh in Photo interprétation, vol 42 n° 3 (Septembre 2006)
PermalinkA three dimensional scatterer map extends the DEM information in urban areas / Nico Adam in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)
PermalinkDEM generation using Quickbird stereo data without ground controls, using tie points only / Penggen Cheng in Geoinformatics, vol 9 n° 2 (01/03/2006)
PermalinkDetection of ancient settlement mounds: archaeological survey based on the STRM terrain model / B.H. Menze in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 3 (March 2006)
PermalinkThe STRM data "finishing" process and products / J.A. Slater in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 3 (March 2006)
PermalinkA strategy for determining the regional geoid by combining limited ground data with satellite-based global geopotential and topographical models: a case study of Iran / R. Kiamehr in Journal of geodesy, vol 79 n° 10-11 (February 2006)
PermalinkApports de la télédétection et des SIG à la définition de la sensibilité des sols à l'érosion et au suivi de l'occupation du sol sur l'ile d'Anjouan / A. Amir (2006)
PermalinkShuttle Radar Topography Mission elevation data error and its relationship to land cover / A. Shortridge in Cartography and Geographic Information Science, vol 33 n° 1 (January 2006)
PermalinkEffect of the STRM global DEM on the determination of a high-resolution geoid model: A case study in Iran / R. Kiamehr in Journal of geodesy, vol 79 n° 9 (December 2005)
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