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A comparative analysis of scanned maps and imagery for mapping applications / Costas Armenakis in ISPRS Journal of photogrammetry and remote sensing, vol 57 n° 5-6 (April - May 2003)
[article]
Titre : A comparative analysis of scanned maps and imagery for mapping applications Type de document : Article/Communication Auteurs : Costas Armenakis, Auteur ; F. Leduc, Auteur ; I. Cyr, Auteur ; F. Savopol, Auteur ; François Cavayas, Auteur Année de publication : 2003 Article en page(s) : pp 304 - 314 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] analyse comparative
[Termes IGN] analyse d'image numérique
[Termes IGN] analyse diachronique
[Termes IGN] analyse en composantes principales
[Termes IGN] analyse texturale
[Termes IGN] Canada
[Termes IGN] carte numérisée
[Termes IGN] carte topographique
[Termes IGN] cartographie automatique
[Termes IGN] classification
[Termes IGN] détection de changement
[Termes IGN] détection de contours
[Termes IGN] données maillées
[Termes IGN] extraction automatique
[Termes IGN] fusion d'images
[Termes IGN] image Landsat
[Termes IGN] image Landsat-ETM+
[Termes IGN] lac
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] objet géographique zonal
[Termes IGN] seuillage d'imageRésumé : (Auteur) In mapping organizations, the implementation of more automation coupled with the availability of heterogeneous data requires the investigation, adaptation and evaluation of new approaches and techniques. The demand for rapid mapping operations such as database generation and updating is continuously increasing. Due to the rising use of raster data, image analysis techniques have been investigated and tested in this study to introduce automation in the assessment of scanned topographic monochrome maps and Landsat 7 ETM+ imagery for feature separation and extraction in northern Canada. The work focuses on the detection and extraction of lakes predominant features in the North as well as on to their spatiotemporal comparison. Various approaches using digital image processing techniques were implemented and evaluated. Thresholding and texture measures were used to evaluate the potential of rapid extraction of certain topographic elements from scanned monochrome maps of northern Canada. A raster to vector approach (R> V) followed for the vectorization of these extracted features. The extraction of features from Landsat 7 ETM+ imagery involved image and theme enhancement by applying various image fusion and spectral transformations (e.g., Brovey, PC1IMGFUSE, intensity hue saturation (IHS), principal component analysis (PCA), Tasseled Cap, Normalized Difference Vegetation Index (NDVI)), followed by image classification and thresholding. Tests showed that the approaches were more or less featuredependent, while, at the same time, they can augment and significantly enhance the conventional topographic mapping methods. Following the analysis of the map and image data, change detection between two lake datasets was performed both interactively and in an automated mode based on the nonintersection of old and new features. The various approaches and methodology developed and implemented within a GIS environment along with examples, results and limitations are presented and discussed. Copyright ISPRS Numéro de notice : A2003-062 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(02)00160-0 En ligne : https://doi.org/10.1016/S0924-2716(02)00160-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22358
in ISPRS Journal of photogrammetry and remote sensing > vol 57 n° 5-6 (April - May 2003) . - pp 304 - 314[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-03021 RAB Revue Centre de documentation En réserve L003 Disponible 081-03022 RAB Revue Centre de documentation En réserve L003 Disponible An algorithm for the generation of Voronoi diagrams on the sphere based on QTM [quaternary triangular mesh] / Jun Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 1 (January 2003)
[article]
Titre : An algorithm for the generation of Voronoi diagrams on the sphere based on QTM [quaternary triangular mesh] Type de document : Article/Communication Auteurs : Jun Chen, Auteur ; X. Zhao, Auteur ; Z. Li, Auteur Année de publication : 2003 Article en page(s) : pp 79 - 89 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] diagramme de Voronoï
[Termes IGN] maille triangulaire
[Termes IGN] objet géographique linéaire
[Termes IGN] objet géographique ponctuel
[Termes IGN] objet géographique zonal
[Termes IGN] sphèreRésumé : (Auteur) In order to efficiently store and analyze spatial data on a global scale, the digital expression of Earth data in a data model must be global, continuous, and conjugate, i.e., a spherical dynamic data model is needed. The Voronoi data structure is the only published attempt (Wright and Goodchild, 1997) and the only possible solution currently available (Li et al., 1999) for a dynamic Gis. However, the complexity of the Voronoi algorithm for line sets and area sets in vector mode limits its application in a dynamic GIS. So far, there is no raster-based Voronoi algorithm for objects (including points, arcs, and regions) on a spherical surface. To overcome this serious deficiency, an algorithm for generating u spherical Voronoi diagram is presented, based on the O-QTM (Octahedral Quaternary Triangular Mesh). The principle of the dilation operation in mathematical morphology is extended to the spherical surface. A method is developed for a spherical distance transformation based on the QTM. A detailed algorithm is also presented. This algorithm can handle points, arcs, and area features on a spherical surface. Tests have shown that the computational time consumption of this algorithm with points, arcs, and areas is equal and proportionate to the levels of the spherical surface tessellation; and the difference (distortion) between the great circle distance and the QTm cells distance is slightly related to spherical distance (not as the roster dilation on a planar surface), and is mainly related to the locations of the generating points. Numéro de notice : A2003-004 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.14358/PERS.69.1.79 En ligne : https://doi.org/10.14358/PERS.69.1.79 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22302
in Photogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 1 (January 2003) . - pp 79 - 89[article]
Titre : Automatische Extraktion von Bäumen aus Fernerkundungsdaten Titre original : [Extraction automatique des arbres à partir des données de télédétection] Type de document : Thèse/HDR Auteurs : B.M. Straub, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 572 Importance : 97 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5011-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] arbre (flore)
[Termes IGN] classification floue
[Termes IGN] extraction automatique
[Termes IGN] objet géographique zonal
[Termes IGN] photo-interprétation assistée par ordinateur
[Termes IGN] reconnaissance de formes
[Termes IGN] segmentation d'imageIndex. décimale : 35.20 Traitement d'image Résumé : (Auteur) A new approach for automatic extraction of trees from remote sensing data - aerial imagery and surface models - is introduced in this thesis. A detailed description of the most important considerations, leading to the development of the approach, is given: for the model of an individual tree, which is the base of the approach and for the strategy for low-level feature extraction and generation of hypotheses. In addition to that, the extraction of individual trees is discussed in relation to other topographic objects. The aim of this discussion is showing possibilities for the integration of the approach for trees into a system for automatic interpretation of remote sensing data. Here, extraction should be understood as the cognitive recognition of objects and their identification and reconstruction. The process of object extraction from images and/or surface models generally depends on an object model as well as a strategy for extraction of image features, their combination, and their relation to the model. A generic geometric model of a tree is used which basically consists of a function describing the tree top. Based on this model features are identified, which are used to recognise single trees from the image data. The basic idea for this strategy consists of two steps. At first, the often very complex fine structures are removed from the surface model by using various scale levels in linear scale space. As a result of scale-space transformation the tree top can be identified in the surface model based on the coarse structure. Here, the main problem is, that on the one hand the diameter of a single tree continuously varies in reality, but also strongly influences the choice of filter parameters. To overcome this difficulty, the image data was examined at different scale levels of linear scale-space. The extraction of the trees is performed using an algorithm: Firstly, segmentation of each scale-level with the watershed transformation is carried out. The resulting segments, which are potential candidates for tree tops, are evaluated with the help of fuzzy functions and based on the resulting membership values hypotheses are generated. The last step is the reconstruction of the crown's outline using a snake-algorithm. The procedure, developed for the extraction of trees from images and surface models in the context of this thesis, is applied in various small test areas. The positive as well as the negative results of these projects are presented, and the problems are discussed based on subsets of the test areas. An evaluation of the approach, and proposals for further development and research are given at the end of the thesis. Numéro de notice : 13202 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Thèse étrangère DOI : sans En ligne : https://dgk.badw.de/fileadmin/user_upload/Files/DGK/docs/c-572.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54912 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13202-01 35.20 Livre Centre de documentation Télédétection Disponible 13202-02 35.20 Livre Centre de documentation Télédétection Disponible
Titre : Automatische Georeferenzierung von Fernerkundungsdaten Titre original : [Géoréférencement automatique de données de télédétection] Type de document : Thèse/HDR Auteurs : Heiner Hild, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2003 Collection : DGK - C Sous-collection : Dissertationen num. 562 Importance : 132 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5001-3 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique
[Termes IGN] arbre (mathématique)
[Termes IGN] base de données ATKIS
[Termes IGN] classe d'objets
[Termes IGN] détection de contours
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] extraction automatique
[Termes IGN] géoréférencement
[Termes IGN] méthode robuste
[Termes IGN] objet géographique zonal
[Termes IGN] points homologues
[Termes IGN] polygoneIndex. décimale : 33.30 Photogrammétrie numérique Résumé : (Auteur) In photogrammetry and remote sensing, the processing of image based information within a GIS is based on georeferenced data. The methods of direct georeferencing naturally have a high level of automation where indirect methods still need manual interaction. Within this thesis, a completely implemented system for automatic indirect georeferencing is presented. The developed procedure is based on features of polygons being extracted in the data sets to be matched. Where image data are in raster form by nature, reference data for the outlined system can be in raster or in vector form. There do not exist any limitations in form of approximate values. The extraction of polygonal objects from image data is carried out by multiple segmentation. In order to evaluate the results of the chosen region-growing algorithm, several examinations are carried out. Merging of neighboured polygons with the same object class does the extraction of suitable polygons from GIS reference data. Within the framework of this thesis, German ATKIS data are used exclusively. Based on the theory of affine invariants of algebraic forms, features are developed which can be computed from geometric moments of raster and vector polygons. Alternatively, polygon features are derived from cross-weighted moment's invariants that can be obtained from geometric moments of raster and vector polygons in a similar way. Studies on the robustness of the features and their ability to discriminate similar objects are carried out by the use of synthetic and real data. A backtracking-depht-first tree search algorithm with unary and binary constraints obtains the matching of image and reference data. In order to formulate the constraints, an affine transformation is computed from the geometric moments for each pair. The procedure is based on the theory of standard positions. A closing verification step leads to a global affine transformation between image and reference system. The approximate transformation is individually refined with the IterativeClosestPoint algorithm. Based on the optimised affine transformation for each polygon pair, tie points are generated automatically on the borderline of the polygons. Based on a theoretical consideration, extensive studies on the achievable tie point accuracy were carried out with three synthetic and real data sets. The performance and robustness of the developed system under various input data is demonstrated by controlled application of disturbances. Numéro de notice : 15029 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : sans En ligne : https://www.ifp.uni-stuttgart.de/dokumente/Dissertationen/hild_c-562.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55047 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15029-02 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible 15029-01 33.30 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Extracting 3D free-form surface boundaries of man-made objects from multiple calibrated images : a robust, accurate and high resolving power edgel matching and chaining approach / Franck Jung (2003)
contenu dans Proceedings of the ISPRS conference IC II/IV, WG III/4, III/5, III/6 Photogrammetric image analysis, 17-19 September, 2003, Munich, Germany / Heinrich Ebner (2003)
Titre : Extracting 3D free-form surface boundaries of man-made objects from multiple calibrated images : a robust, accurate and high resolving power edgel matching and chaining approach Type de document : Article/Communication Auteurs : Franck Jung , Auteur ; Nicolas Paparoditis , Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2003 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 38-3/W8 Conférence : PIA 2003, ISPRS Conference on Photogrammetric image analysis 17/09/2003 19/09/2003 Munich Allemagne OA ISPRS Archives Importance : 5 p. Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] appariement de lignes
[Termes IGN] cohérence des données
[Termes IGN] compensation par faisceaux
[Termes IGN] détail topographique artificiel
[Termes IGN] détection de contours
[Termes IGN] méthode robuste
[Termes IGN] modèle numérique de surface
[Termes IGN] objet cartographique
[Termes IGN] objet géographique zonal
[Termes IGN] pixel de contour
[Termes IGN] reconstruction 3D
[Termes IGN] reconstruction d'objet
[Termes IGN] zone urbaineRésumé : (Auteur) This paper describes a purely geometrical approach for matching and chaining edgels, i.e. contours points with their tangent direction, to reconstruct in a general way 3D rectilinear or curved surface boundaries from multiple calibrated images. Results show that the 3D reconstructed edgels are highly reliable and accurate, and correctly reproduce the 3D limits of very small image structures thus demonstrating the high resolving power of this technique and enabling a finer description and understanding of urban scenes. 3D Edgels are a key feature for reconstructing man-made objects. Practical examples of edgels reconstruction are given on various type ot 3D objects (roundabouts, zebra crossings, cars, classical and odd shape buildings, dormer Windows) in surveys at a ground pixel size of 25 cm. Practical examples of edgels integration within a surface reconstruction or 3D pattern recognition and object extraction processes are also provided. Indeed 3D edgels can be used as characteristic and constraining lines for the surface topography reconstruction and used to build the limits of cartographic objects thus ensuring a natural geometrical and topological coherence between Digital Surface Models and Digital Object Models. Numéro de notice : C2003-034 Affiliation des auteurs : MATIS (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : http://www.isprs.org/proceedings/XXXIV/3-W8/papers/pia03_s1p4.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64400 Documents numériques
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