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PostGIS : Introduction / Fabien Guerreiro (2015)
Titre : PostGIS : Introduction Type de document : Guide/Manuel Auteurs : Fabien Guerreiro, Auteur ; Jean-François Gigand, Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2015 Importance : 232 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] agrégation de données
[Termes IGN] base de données relationnelles
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] jointure spatiale
[Termes IGN] logiciel SIG
[Termes IGN] module spatial
[Termes IGN] opérateur spatial
[Termes IGN] PostGIS
[Termes IGN] PostgreSQL
[Termes IGN] QGIS
[Termes IGN] SQL
[Termes IGN] système de gestion de bases de données relationnelles
[Termes IGN] tri (informatique)Index. décimale : 37.35 Logiciels SIG Note de contenu : Objectifs
1 - Présentation de la formation
2 - Rappels SIG
3 - Rappels sur les bases de données relationnelles
4 - Rappels QGISNuméro de notice : 21598 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Manuel informatique Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90643 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21598-01 37.35 Livre Centre de documentation Géomatique Disponible Recognizing text in raster maps / Yao-Yi Chiang in Geoinformatica, vol 19 n° 1 (January - March 2015)
[article]
Titre : Recognizing text in raster maps Type de document : Article/Communication Auteurs : Yao-Yi Chiang, Auteur ; Craig A. Knoblock, Auteur Année de publication : 2015 Article en page(s) : pp 1 - 27 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] carte ancienne
[Termes IGN] données maillées
[Termes IGN] information géographique
[Termes IGN] placement des écritures
[Termes IGN] reconnaissance de caractères
[Termes IGN] système d'information cartographique
[Termes IGN] toponymeRésumé : (auteur) Text labels in maps provide valuable geographic information by associating place names with locations. This information from historical maps is especially important since historical maps are very often the only source of past information about the earth. Recognizing the text labels is challenging because heterogeneous raster maps have varying image quality and complex map contents. In addition, the labels within a map do not follow a fixed orientation and can have various font types and sizes. Previous approaches typically handle a specific type of map or require intensive manual work. This paper presents a general approach that requires a small amount of user effort to semi-automatically recognize text labels in heterogeneous raster maps. Our approach exploits a few examples of text areas to extract text pixels and employs cartographic labeling principles to locate individual text labels. Each text label is then rotated automatically to horizontal and processed by conventional OCR software for character recognition. We compared our approach to a state-of-art commercial OCR product using 15 raster maps from 10 sources. Our evaluation shows that our approach enabled the commercial OCR product to handle raster maps and together produced significant higher text recognition accuracy than using the commercial OCR alone. Numéro de notice : A2015-484 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-014-0203-9 Date de publication en ligne : 21/02/2014 En ligne : https://doi.org/10.1007/s10707-014-0203-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77246
in Geoinformatica > vol 19 n° 1 (January - March 2015) . - pp 1 - 27[article]A triangular form-based multiple flow algorithm to estimate overland flow distribution and accumulation on a digital elevation model / Petter Pilesjö in Transactions in GIS, vol 18 n° 1 (February 2014)
[article]
Titre : A triangular form-based multiple flow algorithm to estimate overland flow distribution and accumulation on a digital elevation model Type de document : Article/Communication Auteurs : Petter Pilesjö, Auteur ; Abdulghani Hasan, Auteur Année de publication : 2014 Article en page(s) : pp 108 - 124 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] données maillées
[Termes IGN] flux
[Termes IGN] maillage par triangles
[Termes IGN] maille triangulaire
[Termes IGN] modèle numérique de surface
[Termes IGN] tessellationRésumé : (Auteur) In this study, we present a newly developed method for the estimation of surface flow paths on a digital elevation model (DEM). The objective is to use a form-based algorithm, analyzing flow over single cells by dividing them into eight triangular facets and to estimate the surface flow paths on a raster DEM. For each cell on a gridded DEM, the triangular form-based multiple flow algorithm (TFM) was used to distribute flow to one or more of the eight neighbor cells, which determined the flow paths over the DEM. Because each of the eight facets covering a cell has a constant slope and aspect, the estimations of – for example – flow direction and divergence/convergence are more intuitive and less complicated than many traditional raster-based solutions. Experiments were undertaken by estimating the specific catchment area (SCA) over a number of mathematical surfaces, as well as on a real-world DEM. Comparisons were made between the derived SCA by the TFM algorithm with eight other algorithms reported in the literature. The results show that the TFM algorithm produced the closest outcomes to the theoretical values of the SCA compared with other algorithms, derived more consistent outcomes, and was less influenced by surface shapes. The real-world DEM test shows that the TFM was capable of modeling flow distribution without noticeable ‘artefacts’, and its ability to track flow paths makes it an appropriate platform for dynamic surface flow simulation. Numéro de notice : A2014-067 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12015 Date de publication en ligne : 06/02/2013 En ligne : https://doi.org/10.1111/tgis.12015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32972
in Transactions in GIS > vol 18 n° 1 (February 2014) . - pp 108 - 124[article]
Titre : Automatische Interpretation von Semantik aus digitalen Karten im World Wide Web Type de document : Thèse/HDR Auteurs : Fen Luo, Auteur ; Dieter Fritsch, Directeur de thèse ; Ralf Bill, Directeur de thèse Editeur : Stuttgart : Institüt für Photogrammetrie der Universität Stuttgart Année de publication : 2014 Note générale : bibliographie
Von der Fakultät Luft- und Raumfahrttechnik und Geodäsie der Universität Stuttgart zur Erlangung der Würde eines Doktors der Ingenieurwissenschaften (Dr.-Ing.) genehmigte AbhandlungLangues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] carte de Kohonen
[Termes IGN] données maillées
[Termes IGN] données vectorielles
[Termes IGN] échelle cartographique
[Termes IGN] exploration de données géographiques
[Termes IGN] objet géographique
[Termes IGN] réseau neuronal artificiel
[Termes IGN] toile d'araignée mondialeRésumé : (auteur) On the Internet there are innumerable spatial data representing different sections of the world in form of raster and vector maps. The information contained in these maps is not automatically discoverable, since it is encoded by means of certain map elements. Its semantics is not explicit unless interpreted by an observer. However, the map information can be interpreted by not only humans but also ma-chines. This already requires the large amount of data to be interpreted. We are going to summarize the automatic derivation of semantics from the maps in terms of automatic map interpretation. It involves a process of making the implicit information of a map inventory explicit. For this purpose we present the map interpretation as solutions.
The map interpretation of the current study is done with vector maps what can be found on the internet. For the targeted search of vector maps of the internet, a web crawler is specially developed. The web crawler is a search engine that specifically looks for vector maps. For this, exclusively the shapefile format is sought, which has become a standard format in the GIS environment and in which the vector maps are usually stored. In order to find shapefiles as many as possible, the search is carried out on servers where the probability of finding shapefiles is high. These servers were previously found through the keyword “shapefile download” by Google search.
The maps interpretation includes methods of interpretation of the map objects, of the map types, and of the map scale. First, we will introduce the method of interpreting the map objects. Our aim is to automatically detect the objects based on their specific characteristics. The object recognition is based on self-organizing map (SOM) that is borrowed from artificial intelligence. The map objects are clas-sified into, for example, building floor plan and road network. Its own characteristics should be found for each class and brought in one of the accessible forms of SOM, in this case, a parameter vector. The parameter vectors form the input patterns that are learned in the training phase of SOM. After the input patterns of all object classes of SOM have been learned, the parameter vector is evaluated for each of the present objects on the map and given to the SOM. By the previously successful learning of the input pattern, the objects can be assigned based on each of their calculated parameter vectors of the corresponding object class.
The interpretation of map type is presented as another method. Maps are categorized into different types according to their substantive content and purpose, such as river maps, road maps, contour maps, etc. As for the interpretation of objects, SOM is used here. Hence the input patterns will also be learned which represent the geometric characteristics of the map types. The characteristics arise from both the structure of individual objects and the topology between objects on a map. Now, with a given map in the SOM, the SOM recognizes the appropriate map type according to the learned input pattern. In addition, one obtains the filenames of the maps as well as the content of the website where the map was found. In the present thesis we also investigated how this additional information can help in the interpretation of map type.
The automatic interpretation of the map scale is a further method in addition to the interpretation of the map objects and map types, which is discussed in the present thesis. The interpretation of the map scale is implemented in two ways: the multi-representation and the details grade. In the former case, the scale of the relevant representation can be derived, where an identical object in different realistic representations on the map is shown; while in the latter case, the scale is derived from the details grade, on the basis of the fact that maps with different scales are displayed on different levels of details.Numéro de notice : 17347 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Thèse étrangère DOI : sans En ligne : http://doi.org/10.18419/opus-3960 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83706 QGIS 2 et SFCGAL 1 / Anonyme in Géomatique expert, n° 95 (01/11/2013)
[article]
Titre : QGIS 2 et SFCGAL 1 Type de document : Article/Communication Auteurs : Anonyme, Auteur Année de publication : 2013 Article en page(s) : pp 6 - 9 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] analyse spatiale
[Termes IGN] bibliothèque logicielle
[Termes IGN] données maillées
[Termes IGN] ergonomie
[Termes IGN] GRASS
[Termes IGN] intersection spatiale
[Termes IGN] modèle numérique de terrain
[Termes IGN] Oracle
[Termes IGN] PostGIS
[Termes IGN] Python (langage de programmation)
[Termes IGN] QGIS
[Termes IGN] Qt
[Termes IGN] SIG 2D
[Termes IGN] SQL
[Termes IGN] symbole graphique
[Termes IGN] traitement d'image
[Termes IGN] visualisation 3D
[Termes IGN] Web Coverage ServiceRésumé : (Auteur) Deux copieuses pièces de résistance au menu de la rentrée : la (très attendue) version 2.0 de QGIS, et l'arrivée de la bibliothèque SFCGAL, grâce à laquelle PostGIS va enfin pouvoir réaliser des analyses 3D. Numéro de notice : A2013-651 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32787
in Géomatique expert > n° 95 (01/11/2013) . - pp 6 - 9[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 265-2013061 RAB Revue Centre de documentation En réserve L003 Disponible IFN-001-P001517 PER Revue Nogent-sur-Vernisson Salle périodiques Disponible Afficher des données IGN en 3D sous iPhone/iPad [1] / Anonyme in Géomatique expert, n° 93 (01/07/2013)PermalinkComparison of different strategies for determining raster-based least-cost paths with a minimum amount of distortion / H. Antikainen in Transactions in GIS, vol 17 n° 1 (February 2013)PermalinkPermalinkUtiliser la BD Alti comme MNT vectoriel / Anonyme in Géomatique expert, n° 90 (01/01/2013)PermalinkIconMap-based visualisation technique and its application in soil fertility analysis / X. Zhang in Cartographic journal (the), vol 49 n° 3 (August 2012)PermalinkPostGIS pour les néophytes (épisode 10) [11ème partie] : Topologie (suite et fin) / Anonyme in Géomatique expert, n° 87 (01/07/2012)PermalinkWeb geoservices and ancient cadastral maps: The web C.A.R.T.E. project / M. Brovelli in Transactions in GIS, vol 16 n° 2 (April 2012)PermalinkPostGIS pour les néophytes (9ème partie) : PostGIS 2.0 la cartouche raster / Anonyme in Géomatique expert, n° 85 (01/03/2012)PermalinkMapCache : une solution de tuilage WMS open source / Anonyme in Géomatique expert, n° 84 (01/01/2012)PermalinkSmall-footprint Lidar estimations of sagebrush canopy characteristics / J. Mitchell in Photogrammetric Engineering & Remote Sensing, PERS, vol 77 n° 5 (May 2011)Permalink