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Automated extraction of coastline from satellite imagery by integrating canny edge detection and locally adaptative thresholding methods / H. Liu in International Journal of Remote Sensing IJRS, vol 25 n° 5 (March 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 5 (March 2004) . - pp 937 - 958 Titre : Automated extraction of coastline from satellite imagery by integrating canny edge detection and locally adaptative thresholding methods Type de document : Article/Communication Auteurs : H. Liu, Auteur ; K.C. Jezek, Auteur Année de publication : 2004 Article en page(s) : pp 937 - 958 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] courbe de Gauss [Termes IGN] détection de contours [Termes IGN] extraction automatique [Termes IGN] image optique [Termes IGN] image radar [Termes IGN] image satellite [Termes IGN] littoral [Termes IGN] segmentation d'image [Termes IGN] seuillage d'image [Termes IGN] trait de côte Résumé : (Auteur) This paper presents a comprehensive approach to effectively and accurately extract coastlines from satellite imagery. It consists of a sequence of image processing algorithms, in which the key component is image segmentation based on a locally adaptive thresholding technique. Several technical innovations have been made to improve the accuracy and efficiency for determining the land/ water boundaries. The use of the Levenberg-Marquardt method and the Canny edge detector speeds up the convergence of iterative Gaussian curve fitting process and improves the accuracy of the bimodal Gaussian parameters. The result is increased reliability of local thresholds for image segmentation. A series of further image processing steps are applied to the segmented images. Particularly, grouping and labelling contiguous image regions into individual image objects enables us to utilize heuristic human knowledge about the size and continuity of the land and ocean masses to discriminate the true coastline from other object boundaries. The final product of our processing chain is a vector-based line coverage of the coastline, which can be readily incorporated into a GIS database. Our method has been applied to both radar and optical satellite images, and the positional precision of the resulting coastline is measured at the pixel level. Numéro de notice : A2004-077 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000139890 En ligne : https://doi.org/10.1080/0143116031000139890 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26605 [article]

Exemplaires(1)

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080-04051	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

Using Landsat 7 TM data acquired days after a flood event to delineate the maximum flood extent on a coastal floodplain / Y. Wang in International Journal of Remote Sensing IJRS, vol 25 n° 5 (March 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 5 (March 2004) . - pp 959 - 974 Titre : Using Landsat 7 TM data acquired days after a flood event to delineate the maximum flood extent on a coastal floodplain Type de document : Article/Communication Auteurs : Y. Wang, Auteur Année de publication : 2004 Article en page(s) : pp 959 - 974 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse diachronique [Termes IGN] contour [Termes IGN] détection de contours [Termes IGN] image Landsat-TM [Termes IGN] inondation [Termes IGN] zone inondable Résumé : (Auteur) In response to Hurricane Floyd, the Tar River crested at a record height of 4.30m above the flood stage at the river gauge station of Greenville (North Carolina, USA) on 21 September 1999. This resulted in a massive flooding in the area. To delineate the maximum flood extent, an area of 238.4 km2 along the Tar/Pamlico River, North Carolina, and within the overlapped area of Landsat 7 Thematic Mapper (TM) path 14/row 35 and path 15/row 35 scenes was studied. Three TM datasets of 28 July 1999 (path 15/row 35), 23 September 1999 (path 14/row 35) and 30 September 1999 (path 15/row 35) were analysed as preflood data, near peak data, and nine days after the peak data, respectively. The 23 and 30 September flood extent maps were derived by change detection and then verified by 85 nonflooded and flooded sites within the study area. The overall accuracies at the sites were between 82.599.3% on both inundation extent maps. Although the recorded river surface level fell 2.62 m from 23 to 30 September at the river gauge station of Greenville, comparison of the two flood extent maps on a pixel-by-pixel basis showed an agreement of 90.7% in terms of regular river channels and waterbodies, flooded areas and nonflooded areas. The 30 September map captured over 90% of the flood extent as identified on the 23 September map. These results suggest that it is possible to use remotely sensed data acquired days after a river's crest to capture most of the maximum extent of a flood occurring on a coastal floodplain. and should somewhat reduce the requirement to have concurrently remotely sensed data in mapping a flood extent on a coastal floodplain. Numéro de notice : A2004-078 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000150022 En ligne : https://doi.org/10.1080/0143116031000150022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26606 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04051	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

Surveillance et cartographie des plans d'eau et des zones humides et inondables en régions arides avec l'instrument Végétation embarqué sur SPOT-4 / Valéry Gond in International Journal of Remote Sensing IJRS, vol 25 n° 5 (March 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 5 (March 2004) . - pp 987 - 1004 Titre : Surveillance et cartographie des plans d'eau et des zones humides et inondables en régions arides avec l'instrument Végétation embarqué sur SPOT-4 Type de document : Article/Communication Auteurs : Valéry Gond, Auteur Année de publication : 2004 Article en page(s) : pp 987 - 1004 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Burkina Faso [Termes IGN] cartographie thématique [Termes IGN] composition colorée [Termes IGN] données multitemporelles [Termes IGN] image SPOT-Végétation [Termes IGN] lac [Termes IGN] plan d'eau [Termes IGN] prise en compte du contexte [Termes IGN] signature spectrale [Termes IGN] surveillance hydrologique [Termes IGN] zone aride [Termes IGN] zone humide Résumé : (Auteur) L'observation régulière de l'état des petits plans d'eau et des zones humides est très utile dans les régions arides et semi-arides, car leur existence est entièrement contrôlée par le rythme des pluies. Sur les images en composition colorée des données VEGETATION, les plans d'eau et les bas-fonds sont clairement identifiables. Une simple classification de la signature spectrale des zones observées ne suffit pas à les repérer, car les conditions écologiques varient énormément de même que le comportement radiométrique. Dans cette étude, une méthode contextuelle basée sur le contraste local a été élaborée et testée. Une validation systématique a été menée et une carte des plans d'eau et des zones humides a été produite pour le Burkina Faso et les régions voisines. Numéro de notice : A2004-079 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000139908 En ligne : https://doi.org/10.1080/0143116031000139908 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26607 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04051	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

G-WMAP: a statistical speckle filter operating in the wavelet domain / S. Solbo in International Journal of Remote Sensing IJRS, vol 25 n° 5 (March 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 5 (March 2004) . - pp 1019 - 1036 Titre : G-WMAP: a statistical speckle filter operating in the wavelet domain Type de document : Article/Communication Auteurs : S. Solbo, Auteur ; T. Eltoft, Auteur Année de publication : 2004 Article en page(s) : pp 1019 - 1036 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] analyse comparative [Termes IGN] filtrage du rayonnement [Termes IGN] filtre de déchatoiement [Termes IGN] image Radarsat [Termes IGN] ondelette [Termes IGN] radar à antenne synthétique Résumé : (Auteur) In this paper we introduce the g-WMAP filter. a wa~elet based equivalent to the classical g-MAP filter. We model speckle as additive signaldependent noise, and propose to use the normal inverse Gaussian (NIG) distribution as a statistical model for the wavelet coefficients of both the reflectance image and the noise image. A method for estimating the parameters of the proposed statistical models is presented, and we show that the NIG distribution makes excellent fits to the distributions of the wavelet coefficients of single-look synthetic aperture radar (SAR) images. The performance of the g-WMAP filter is tested on three single-look SAR images. We find that when the filter is used in a global mode it may severely blur the image. However, when applied in a local, adaptive mode the new algorithm has excellent de-speckling performance. Visual comparisons with the g-MAP filter show that g-WMAP tends to give better de-speckling. Quantitative comparisons in homogeneous regions using both the equivalent number of looks and the log standard deviation as measures definitely show that the g-WMAP gives better speckle filtering. Numéro de notice : A2004-080 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000150040 En ligne : https://doi.org/10.1080/0143116031000150040 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26608 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04051	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt

Accuracy analysis of remote sensing change detection by rule-based rationality evaluation with post-classification comparison / H. Liu in International Journal of Remote Sensing IJRS, vol 25 n° 5 (March 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 5 (March 2004) . - pp 1037 - 1050 Titre : Accuracy analysis of remote sensing change detection by rule-based rationality evaluation with post-classification comparison Type de document : Article/Communication Auteurs : H. Liu, Auteur ; Q. Zhou, Auteur Année de publication : 2004 Article en page(s) : pp 1037 - 1050 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] classification [Termes IGN] détection de changement [Termes IGN] estimation de précision [Termes IGN] image multitemporelle [Termes IGN] Kappa de Cohen [Termes IGN] zone urbaine Résumé : (Auteur) Accuracy assessment for remote sensing classification is commonly based on using an error matrix, or confusion table, which needs reference, or 'ground truthing', data to support. When undertaking change detection using numerous multi-temporal images, it is often difficult to make the accuracy assessment by the 'traditional' method, which typically requires simultaneous collection of reference data. In this study, we propose a new approach by arguing change rationality with post-classification comparison. Multitemporal Landsat TM images were classified for land use in an urban fringe area of Beijing, China and the post-classification comparison of these classified images shows change trajectories through the time series. These change trajectories were then analysed by assessing their rationality against a set of logical rules to separate cases of 'real land use change' and possible classification errors. The analvsis results show that the overall accuracy for land use change in the urban fringe area was 86%, with a fuzziness of 7%. Although it is argued that the uncertainty, still exists on classification accuracy assessed by this method. It nevertheless provides an alternative approach for more reasonable assessment when ideal simultaneous 'ground truthing' is not available. Numéro de notice : A2004-081 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000150004 En ligne : https://doi.org/10.1080/0143116031000150004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26609 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-04051	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt