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Complexity-based matching between image resolution and map scale for multiscale image-map generation / Qian Peng in International journal of geographical information science IJGIS, vol 35 n° 10 (October 2021)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 35 n° 10 (October 2021) . - pp 1951 - 1974 Titre : Complexity-based matching between image resolution and map scale for multiscale image-map generation Type de document : Article/Communication Auteurs : Qian Peng, Auteur ; Zhilin Li, Auteur ; Jun Chen, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 1951 - 1974 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] appariement de lignes [Termes IGN] échelle cartographique [Termes IGN] Hong-Kong [Termes IGN] niveau de détail [Termes IGN] objet géographique linéaire [Termes IGN] orthophotocarte [Termes IGN] précision cartographique [Termes IGN] précision planimétrique [Termes IGN] résolution globale (imagerie) [Termes IGN] symbole graphique [Termes IGN] visualisation multiéchelle [Vedettes matières IGN] Généralisation Résumé : (auteur) An image-map is a compromise between an image and a map. The quality of such maps is affected by several factors, such as (a) the matching between the features on images and the graphic symbols from maps, (b) the complexity of background images, and (c) the representation of graphic and text symbols on the images. This project deals with the first issue. The current solution is that the accuracy of images should satisfy the accuracy standard of maps. However, images with different resolutions can satisfy the standard for a specific map scale. This may lead to a situation in which the levels of detail (LoD) in images may not match the complexity of map features although the planimetric accuracy is matched. To solve this problem, we developed a complexity-based matching between the image resolution and map scale. More precisely, the matching is based on the complexity of line features. Experimental evaluations were conducted in 15 representative areas in Hong Kong using maps at seven scales and eight image resolutions. Results show that the proposed complexity-based method is capable of obtaining good matching between image resolution and map scale in terms of both accuracy and users’ preference. Numéro de notice : A2021-655 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2021.1885674 date de publication en ligne : 12/04/2021 En ligne : https://doi.org/10.1080/13658816.2021.1885674 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98391 [article]

Hook, line and sinker / Jakub Karas in GEO: Geoconnexion international, vol 15 n° 7 (July - August 2016)

Public [article]  inGEO: Geoconnexion international > vol 15 n° 7 (July - August 2016) . - pp 42 - 43 Titre : Hook, line and sinker Type de document : Article/Communication Auteurs : Jakub Karas, Auteur Année de publication : 2016 Article en page(s) : pp 42 - 43 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] acquisition de données [Termes IGN] bathymétrie [Termes IGN] orthophotocarte [Termes IGN] République Tchèque Résumé : (éditeur) Annual lake discharges in the Czech Republic are a prime time to measure the lake bottoms – if you’re quick enough. Jakub Karas explains how he used a UAV to help create orthophotomaps and DTMs of the republic’s secondlargest lake in less than half a day. Numéro de notice : A2016-502 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81525 [article]

SGM-based seamline determination for urban orthophoto mosaicking / Shiyan Pang in ISPRS Journal of photogrammetry and remote sensing, vol 112 (February 2016)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 112 (February 2016) . - pp 1 – 12 Titre : SGM-based seamline determination for urban orthophoto mosaicking Type de document : Article/Communication Auteurs : Shiyan Pang, Auteur ; Mingwei Sun, Auteur ; Xiangyun Hu, Auteur ; Zuxun Zhang, Auteur Année de publication : 2016 Article en page(s) : pp 1 – 12 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] appariement semi-global [Termes IGN] approche pixel [Termes IGN] géométrie épipolaire [Termes IGN] mosaïquage d'images [Termes IGN] orthoimage [Termes IGN] orthophotocarte [Termes IGN] raccord d'images [Termes IGN] seuillage d'image [Termes IGN] zone urbaine Résumé : (auteur) Mosaicking is a key step in the production of digital orthophoto maps (DOMs), especially for large-scale urban orthophotos. During this step, manual intervention is commonly involved to avoid the case where the seamline crosses obvious objects (e.g., buildings), which causes geometric discontinuities on the DOMs. How to guide the seamline to avoid crossing obvious objects has become a popular topic in the field of photogrammetry and remote sensing. Thus, a new semi-global matching (SGM)-based method to guide seamline determination is proposed for urban orthophoto mosaicking in this study, which can greatly eliminate geometric discontinuities. The approximate epipolar geometry of the orthophoto pairs is first derived and proven, and the approximate epipolar image pair is then generated by rotating the two orthorectified images according to the parallax direction. A SGM algorithm is applied to their overlaps to obtain the corresponding pixel-wise disparity. According to a predefined disparity threshold, the overlap area is identified as the obstacle and non-obstacle areas. For the non-obstacle regions, Hilditch thinning algorithm is used to obtain the skeleton line, followed by Dijkstra’s algorithm to search for the optimal path on the skeleton network as the seamline between two orthophotos. A whole seamline network is constructed based on the strip information recorded in flight. In the experimental section, the approximate epipolar geometric theory of the orthophoto is first analyzed and verified, and the effectiveness of the proposed method is then validated by comparing its results with the results of the geometry-based, OrthoVista, and orthoimage elevation synchronous model (OESM)-based methods. Numéro de notice : A2016-135 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://www.sciencedirect.com/science/article/pii/S0924271615002579#gr1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80304 [article]

Fully automatic generation of geoinformation products with chinese zy-3 satellite imagery / Yongjun Zhang in Photogrammetric record, vol 29 n° 148 (December 2014 - February 2015)  

Public [article]  inPhotogrammetric record > vol 29 n° 148 (December 2014 - February 2015) . - pp 383–401 Titre : Fully automatic generation of geoinformation products with chinese zy-3 satellite imagery Type de document : Article/Communication Auteurs : Yongjun Zhang, Auteur ; Bo Wang, Auteur ; Zuxung Zhang, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 383–401 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] image ZiYuan-3 [Termes IGN] modèle numérique de surface [Termes IGN] orthophotocarte [Termes IGN] traitement automatique d'images Résumé : (Auteur) The advantages of continuously and soundly obtaining large multidimensional, multiscale and multitemporal observation datasets from satellite remote sensing make it indispensable in building a national spatial data infrastructure. This paper introduces the ZY-3 satellite developed in China and discusses a fully automatic data-processing system to generate geoinformation products, such as digital elevation models (DEMs) and digital orthophotomaps (DOMs), based on ZY-3 imagery. The key technologies of automatic geoinformation product generation, including strip image-based bundle adjustment together with creating DEMs and DOMs, are illustrated. The accuracies of the georeferencing and automatically generated geoinformation products are also discussed. This automatic data-processing system is shown to provide a good foundation for near real-time derivation of such geoinformation products and for the promotion and application of Chinese domestic satellites. Numéro de notice : A2014-646 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/phor.12078 date de publication en ligne : 16/12/2014 En ligne : https://doi.org/10.1111/phor.12078 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75092 [article]

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Mixing, blending, merging or scrambling topographic maps and orthoimagery in geovisualizations ? / Charlotte Hoarau (2013)    

Public contenu dans Proceedings of the 26th International Cartographic Conference, ICC '13 [ICC 2013] / Manfred F. Buchroithner (2013)   Titre : Mixing, blending, merging or scrambling topographic maps and orthoimagery in geovisualizations ? Type de document : Article/Communication Auteurs : Charlotte Hoarau , Auteur ; Sidonie Christophe , Auteur ; Sébastien Mustière , Auteur Editeur : Paris, ... [Suède] : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2013 Conférence : ICC 2013, 26th International Cartographic Conference ICA 25/08/2013 30/08/2013 Dresde Allemagne OA proceedings Importance : 17 p. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] carte topographique [Termes IGN] conception cartographique [Termes IGN] géovisualisation [Termes IGN] niveau d'abstraction [Termes IGN] orthoimage [Termes IGN] orthophotocarte [Termes IGN] rendu réaliste [Termes IGN] représentation cartographique 2D [Termes IGN] sémiologie graphique [Termes IGN] symbole graphique [Vedettes matières IGN] Géovisualisation Mots-clés libres : adaptive symbolisation  camouflage  overlay patchwork Résumé : (auteur) Geoportals and cartographic applications provide heterogeneous geographic data such as topographic maps or orthoimagery layer and lead to various geovisualization applications. In this paper, our purpose is to analyze advantages and drawbacks of both representations and to look for methods to design in-between representations mixing, blending or merging them. This design will be guided by the results of our study of geovisualizations in use in websites based on the French geoportal (Hoarau 2012). Can we learn from one representation to improve the other one or merge their strengths? This paper outlines why it is a great opportunity to use topographic maps and orthoimagery together to design in-between representations without scrambling initial information. One key issue is then how can we blend both representations to design in-between representations. In this paper we will explore how to go beyond the single use of transparency to superimpose images and maps, as traditionally encountered in numerous geoportals. Could we use the photorealism of orthoimagery data in order to texture empty areas of topographic maps and make them more expressive (Patterson 2002)? Could we use graphic rendering tools in order to make maps more natural (Jenny 2012)? Could we use the colors of the orthoimagery in order to make topographic maps more realists? Could we adapt the symbolization of the roads depending on the color of an orthoimagery background in order to make them more readable? This issue invites us to first analyze the perception given by both representations and their role and use in geovisualization applications. How the world is perceived through topographic maps and orthoimages, which both aims at depicting the same landscape? Maps provide an abstract representation of the world, where features are categorized, selected, and represented with hierarchized and artificial symbols, and where additional information such as geographical names may be added. Orthoimages display all features that may be seen from the sky, with realistic or natural colors and textures, but without prior categorization, which may lead to misinterpretations. The role of the different spatial representations has also to be questioned. As long as maps were only available in paper format as the unique resource of spatial information, they were considered as the main way of storing spatial and geographical knowledge. With the emergence of present technologies, this knowledge has been stored in geographic databases. Maps thus become more adaptive to users’ needs and preferences. Moreover, maps are not any more designed has self sufficient representations but increasingly used to visualize complementary data. They could thus be adapted, faded or lightened in order to fulfill this usage. This evolution generates a “competition” between maps and orthoimagery data as background layers. One preliminary result is the use of orthoimagery patches instead of the green tint area widely used in topographic maps portraying vegetation. This first attempt should be improved weakening transitions from orthoimagery to map visualization, stylizing gradually textures from tint area to photorealistic patterns and adapting the symbolization of vector cartographic features to be better contrasted when overlaid to an orthoimage. Numéro de notice : C2013-031 Affiliation des auteurs : LaSTIG COGIT (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : http://icaci.org/files/documents/ICC_proceedings/ICC2013/_extendedAbstract/185_p [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80187

Documents numériques

en open access Mixing, blending, merging Adobe Acrobat PDF

Republic geodetic authority Bulletin 2010 / Republic geodetic authority (2011)

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L'orthophoto institutionnelle : grande facilité d'emploi et d'interprétation / Michel Kasser in Géomètre, vol 2002 n° 12 (décembre 2002)

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Ortho-rectified or geo-corrected: what's the difference? / S. Simmons in GEO:connexion, vol 1 n° 2 (february 2002)

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Image maps / Bertrand Galtier (01/07/1992)

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Digitale Technologie in der Kartographie, Wiener Symposium, 1988 / F. Mayer (1989)

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Satellite imagery and digital cartography / Jean Denègre (27/09/1988)

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Proceedings of French Qatari regional symposium on remote sensing / University of qatar (1988)

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Spatiocartes et cartographie de la végétation méditerranéenne / V. Barbaroussi (1988)

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Digital elevation models for the orthophoto maps / K.H. Bastian (05/01/1987)

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Influences of reproduction techniques on the identification of topographic details on orthophotomaps / Organisation européenne d'études photogrammétriques expériementales (1986)

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