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Scale and texture in digital image classification / J.S. Ferro in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 1 (January 2002)
[article]
Titre : Scale and texture in digital image classification Type de document : Article/Communication Auteurs : J.S. Ferro, Auteur ; T.A. Warner, Auteur Année de publication : 2002 Article en page(s) : pp 51 - 63 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] accentuation de contours
[Termes IGN] analyse d'image numérique
[Termes IGN] classification dirigée
[Termes IGN] classification multidimensionnelle
[Termes IGN] classification non dirigée
[Termes IGN] classification par maximum de vraisemblance
[Termes IGN] image ADAR
[Termes IGN] image multibande
[Termes IGN] incertitude des données
[Termes IGN] qualité d'image
[Termes IGN] superposition d'imagesRésumé : (Auteur) Classification errors using texture are most likely associated with class edges, but investigators often avoid edges when evaluating textures for classification. The large window needed to produce a stable texture measure produce large edge effects. Small windows minimize edge effects, but often do not provide stable texture measures. Simulated data experiments showed that class separability increased when texture was used in addition to spectral information. Texture separability improved with larger windows. This improvement was over estimated when pixels were chosen away from class edges. Airborne Data Acquisition and Registration (ADAR) data showed that separability of class interiors improved with the addition of texture, but that, for the whole class, separability fell. Maximum-likelihood classification of the ADAR data demonstrated the effect of edges and multiple scales in reducing the accuracy of classification incorporating texture. Numéro de notice : A2002-010 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/january/2002_jan_51-63 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21927
in Photogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 1 (January 2002) . - pp 51 - 63[article]A synergic automatic clustering technique (syneract) for multispectral image analysis / K.Y. Huang in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 1 (January 2002)
[article]
Titre : A synergic automatic clustering technique (syneract) for multispectral image analysis Type de document : Article/Communication Auteurs : K.Y. Huang, Auteur Année de publication : 2002 Article en page(s) : pp 33 - 40 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse d'image numérique
[Termes IGN] analyse de groupement
[Termes IGN] classification dirigée
[Termes IGN] classification ISODATA
[Termes IGN] classification non dirigée
[Termes IGN] image multibandeRésumé : (Auteur) The Iterative Self-Organizing Data Analysis Technique (ISODATA) has been widely used in unsupervised and supervised classification. However, ISODATA suffers from several limitations. The user often spends much analyst time on specifying input parameters by trial and error, particularly initial cluster centers. Of more importance, an inapropriate choice of initial clusters may cause poor classification results. ISODATA is computationally intensive because of its iterative process . This study aimed to develop a synergistic automatic clustering technique (SYNERACT) that combined the hierachical descending and ISODATA clustering procedures to avoid those limitations. The two methods were compared using multispectral digitized video images. An inappropriate choice of initial seeds for SODATA was shown to reduce accuracies significantly. In contrast, SYNERACT was capable of determining the suitable locations for the initial clusters automatically from the data, therby avoiding those limitations. Owing to this capability, SYNERACT was not so heavily dependent on the iterative process as was ISODATA, and thus was much faster than ISODATA. SYNERACT also matched ISODATA in accuracy. Accordingly, SYNERACT could serve as an alternative to ISODATA for multispectral image analysis. Numéro de notice : A2002-008 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/january/2002_jan_33-40 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21925
in Photogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 1 (January 2002) . - pp 33 - 40[article]Trois approches pour la construction automatique de modèles 3D de bâtiments en imagerie aérienne haute résolution / Frank Fuchs (2002)
contenu dans 11ièmes Journées de la recherche de l'IGN, Saint-Mandé, 14 et 15 mars 2002 / IGN (2002)
Titre : Trois approches pour la construction automatique de modèles 3D de bâtiments en imagerie aérienne haute résolution Type de document : Article/Communication Auteurs : Frank Fuchs , Auteur ; Hassan Jibrini , Auteur ; Franck Taillandier , Auteur Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 2002 Conférence : Journées Recherche de l'IGN 2002, 11ièmes journées 14/03/2002 15/03/2002 Saint-Mandé France Importance : 9 p. ; pp 2 - 11 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] bati
[Termes IGN] détection du bâti
[Termes IGN] extraction automatique
[Termes IGN] image à haute résolution
[Termes IGN] modèle numérique de surface
[Termes IGN] modélisation 3D
[Termes IGN] multiscopie
[Termes IGN] photographie aérienne
[Termes IGN] photographie numérique
[Termes IGN] primitive volumique
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] restitution automatiqueRésumé : (Auteur) Le problème de la construction automatique de modèles 3D grande échelle de bâtiment par photogrammétrie aérienne est un des axes de recherche majeurs du laboratoire MATIS. Il est considéré comme suffisamment important pour que trois approches, correspondant à trois configurations opérationnelles différentes, aient été développées : une approche grammaticale partant d'un seul couple stéréoscopique, une approche par extraction de primitive 3D multi-stéréoscopique en utilisant la redondance des points de vue multiples et une approche par calcul de surface polyédrique optimale utilisant un couple stéréoscopique et une base de données cadastrale. Cet article présente ces trois approches de manière indépendante et évoque les possibilités futures de fusion de ces approches. Numéro de notice : C2002-001 Affiliation des auteurs : MATIS (1993-2011) Thématique : IMAGERIE Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64960 Use of contour-based DEM for deriving and mapping topographic attributes / H. Mizukoshi in Photogrammetric Engineering & Remote Sensing, PERS, vol 68 n° 1 (January 2002)
[article]
Titre : Use of contour-based DEM for deriving and mapping topographic attributes Type de document : Article/Communication Auteurs : H. Mizukoshi, Auteur ; M. Aniya, Auteur Année de publication : 2002 Article en page(s) : pp 83 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse d'image numérique
[Termes IGN] détection de contours
[Termes IGN] gradient de pente
[Termes IGN] modèle hydrographique
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] profil topographiqueRésumé : (Auteur) Algorithms using contour-based DEMs to calculate slope gradient and aspect, and to classify and map slope profile and plan forms, were developed, which we call C-BATM (Contour-Based Automatic Terrain Mapping). These are important topographic attributes for various analyses and terrain-related hazard mapping. As a first step, a fall line, the line of the maximum gradients or a flow path, was generated from all data points of all contours. Then, using the fall line segment (between adjacent contours), slope gradient and aspect were calculated. The change in, slope gradients in three consecutives contours are the basis for classifying slope profile from into concave, planar and convex. Slope plan form was classified from the contour crenulation, using a point of inflection by examining the directional change of contour segments (line between two consecutive data points). In the process of classifying slope morphologies, the profile and plans curvatures were also calculated and recorded. Test results of these methods in mountainous areas indicate the advantage of using contour-based DEMs over the use of the grid-based DEM or TIN. These methods have a potential of much wider applications to terrain analyses and hydrological modeling. Numéro de notice : A2002-011 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/2002journal/january/2002_jan_83-93 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21928
in Photogrammetric Engineering & Remote Sensing, PERS > vol 68 n° 1 (January 2002) . - pp 83 - 93[article]Use of knowledge based systems for the detection and monitoring of unplanned developments / Faith Njoki Karanja (2002)
Titre : Use of knowledge based systems for the detection and monitoring of unplanned developments Type de document : Thèse/HDR Auteurs : Faith Njoki Karanja, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2002 Collection : DGK - C Sous-collection : Dissertationen num. 558 Importance : 107 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9597-7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] aide à la décision
[Termes IGN] base de connaissances
[Termes IGN] classification non dirigée
[Termes IGN] détection de changement
[Termes IGN] image satellite
[Termes IGN] interprétation automatique
[Termes IGN] modélisation
[Termes IGN] photo-interprétation
[Termes IGN] prospective
[Termes IGN] représentation graphique
[Termes IGN] simulation
[Termes IGN] surveillance de l'urbanisation
[Termes IGN] système à base de connaissances
[Termes IGN] système d'information géographique
[Termes IGN] traitement d'image
[Termes IGN] zone urbaineRésumé : (Auteur) Within the context of an urban land use, two general status can be distinguished namely developed land (residential, industrial area, construction area, etc), and reserved land (forest, water bodies, garden, parks, open area etc). However, not all developed land is legal or formal a phenomena prevalent in developing countries. For the planners it is important to have the capacity to detect, localise and predict the trend of this phenomenon in order to facilitate reaction planning. In this regard, the main objective of this study is to develop a methodology that exploits existing planning data and urban land use drivers in combination with remotely sensed imagery for the detection and quantification of unplanned developments and subsequently facilitate in monitoring their trends. Since planning is a continuous process, remotely sensed data lends itself to a good source of information pertaining to the extent of developed and reserved areas at any given epoch. The methodology has been subdivided into four modules, namely the interpretation, detection, trend prediction and the evaluation.
Knowledge based image interpretation, namely rule based system was employed in the extraction of developed and reserved areas from multispectral image data. As input into the interpretation process four images cues i.e. NDVI, Texture, Edge Density, and unsupervised classification have been tested. Experience has shown that data reduction and refinement prior to its incorporation in the knowledge base enables few rules to be established and thereby minimising rule correlation. However, knowledge representation is a challenge and especially when it involves rules association. Acceptable results have been obtained which imply that such a technique is promising. Additional information e.g. GIS data would nevertheless be useful as a guide in the extraction of objects like parking areas and some complex built up areas (e.g. buildings), roads, etc thus improving the results.
For the detection of unplanned developments, the constraints of planning data have been exploited. Specifically, planning data has been used in combination with remotely sensed data depicting As It Were situation to generate As It Should Be scenario with specific emphasis on the new legal/allowable developments. This formed a backdrop for the detection of unplanned developments, which essentially translates to the difference between the As It Should Be situation and As It IS within the planning and implementation time frame. Prototype experiments carried out show that this is a feasible technique and can easily be implemented for fast detection in comparison to the current ad hoc field techniques.
In the trend prediction of unplanned developments, land use drivers based on compatibility of land uses, transport network, and hydrography sources are used to establish their influence on the new developed areas. Results show that existing land uses influence highly new developed areas. A combination effect of these influences (land use drivers) when employed results in stratification of pressure zones into fuzzy blocks ranging from those which are likely to undergo extensions of unplanned developments to those which are unlikely. Such information could enable planners develop a program in preparation for such eventualities and priorities areas that require urgent reaction planning.
For the evaluation of the results, both qualitative and quantitative evaluation techniques have been tested namely visual comparison, polygonpixel count and kappa index. Comparable results have been obtained based on these three techniques for the interpretation and detection modules. The choice of which technique to apply depends on the application and the level of detail required.
In conclusion, this study has demonstrated that a 'complete package' that will enable planners to detect and predict the trend of unplanned developments is feasible. In order to ensure success, planning should be viewed as a collective responsibility, where all stakeholders are participants. Further, sound land law system that ensures land accessibility and security of tenure as well as promotes transparency in land allocation issues should be implemented and enforced.Numéro de notice : 15027 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère En ligne : https://d-nb.info/966084659/34 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55045 Réservation
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