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Semantic segmentation of urban textured meshes through point sampling / Grégoire Grzeczkowicz in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol V-2-2022 (2022 edition)  

Public [article]  inISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences > vol V-2-2022 (2022 edition) . - pp 177 - 184 Titre : Semantic segmentation of urban textured meshes through point sampling Type de document : Article/Communication Auteurs : Grégoire Grzeczkowicz , Auteur ; Bruno Vallet , Auteur Année de publication : 2022 Projets : 1-Pas de projet / Article en page(s) : pp 177 - 184 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] échantillonnage de données [Termes IGN] maillage [Termes IGN] maille carrée [Termes IGN] maille triangulaire [Termes IGN] scène urbaine [Termes IGN] segmentation sémantique [Termes IGN] semis de points [Termes IGN] traitement de semis de points Mots-clés libres : maille texturée (maille qui porte l'information géométrique et radiométrique) Résumé : (auteur) Textured meshes are becoming an increasingly popular representation combining the 3D geometry and radiometry of real scenes. However, semantic segmentation algorithms for urban mesh have been little investigated and do not exploit all radiometric information. To address this problem, we adopt an approach consisting in sampling a point cloud from the textured mesh, then using a point cloud semantic segmentation algorithm on this cloud, and finally using the obtained semantic to segment the initial mesh. In this paper, we study the influence of different parameters such as the sampling method, the density of the extracted cloud, the features selected (color, normal, elevation) as well as the number of points used at each training period. Our result outperforms the state-of-the-art on the SUM dataset, earning about 4 points in OA and 18 points in mIoU. Numéro de notice : A2022-427 Affiliation des auteurs : UGE-LASTIG (2020- ) Thématique : IMAGERIE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/isprs-annals-V-2-2022-177-2022 Date de publication en ligne : 17/05/2022 En ligne : https://doi.org/10.5194/isprs-annals-V-2-2022-177-2022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100733 [article]

Application of GIS tools in the measurement analysis of urban spatial layouts using the square grid method / Łukasz Musiaka in ISPRS International journal of geo-information, vol 10 n° 8 (August 2021)  

Public [article]  inISPRS International journal of geo-information > vol 10 n° 8 (August 2021) . - n° 558 Titre : Application of GIS tools in the measurement analysis of urban spatial layouts using the square grid method Type de document : Article/Communication Auteurs : Łukasz Musiaka, Auteur ; Marta Nalej, Auteur Année de publication : 2021 Article en page(s) : n° 558 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] historique des données [Termes IGN] maille carrée [Termes IGN] morphologie urbaine [Termes IGN] morphométrie [Termes IGN] plan de ville [Termes IGN] planification urbaine [Termes IGN] Pologne [Termes IGN] système d'information géographique [Termes IGN] urbanisme Résumé : (auteur) The principal aim of this paper is to present the capabilities of newly developed GIS tools for measurement analysis of urban spatial layouts, using the square grid method. The study of urban morphology and metrology is a multistage process, which involves the metrological analysis of town plans. The main research step is the determination of measurement modules of town layouts, using the square grid. By using GIS software, the authors developed a new tool, named HGIS Tools, which allow to create any number of modular grids with the selected cell size that corresponds to urban units of distance and surface area. When investigating a large number of towns and cities, this offers a significant improvement of the research procedure. The paper presents a test of the tool’s potential on the example of regular medieval towns from the area of the former Teutonic Order state (currently the territory of Poland), diversified in terms of size, genesis and morphometrics. The obtained results confirmed that HGIS Tools allowed to determine the hypothetical measurement module of the layout of the cities studied. The results were consistent with the analyses of other authors carried out with the traditional grid-square methods. The test of the HGIS Tools showed their significant potential in conducting morphometric analyses of spatial arrangements of urban spatial layout on a larger scale. Numéro de notice : A2021-587 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/URBANISME Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/ijgi10080558 En ligne : https://doi.org/10.3390/ijgi10080558 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98205 [article]

Redistribution population data across a regular spatial grid according to buildings characteristics / Beata Calka in Geodesy and cartography, vol 65 n° 2 (December 2016)  

Public [article]  inGeodesy and cartography > vol 65 n° 2 (December 2016) . - pp 149 - 162 Titre : Redistribution population data across a regular spatial grid according to buildings characteristics Type de document : Article/Communication Auteurs : Beata Calka, Auteur ; Elzbieta Bielecka, Auteur ; Katarzyna Zdunkiewicz, Auteur Année de publication : 2016 Article en page(s) : pp 149 - 162 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] base de données topographiques [Termes IGN] bati [Termes IGN] données démographiques [Termes IGN] géolocalisation [Termes IGN] habitat (urbanisme) [Termes IGN] maille carrée [Termes IGN] Pologne [Termes IGN] répartition géographique Résumé : (auteur) Population data are generally provided by state census organisations at the predefined census enumeration units. However, these datasets very are often required at userdefined spatial units that differ from the census output levels. A number of population estimation techniques have been developed to address these problems. This article is one of those attempts aimed at improving county level population estimates by using spatial disaggregation models with support of buildings characteristic, derived from national topographic database, and average area of a flat. The experimental gridded population surface was created for Opatów county, sparsely populated rural region located in Central Poland. The method relies on geolocation of population counts in buildings, taking into account the building volume and structural building type and then aggregation the people total in 1 km quadrilateral grid. The overall quality of population distribution surface expressed by the mean of RMSE equals 9 persons, and the MAE equals 0.01. We also discovered that nearly 20% of total county area is unpopulated and 80% of people lived on 33% of the county territory. Numéro de notice : A2016-978 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1515/geocart-2016-0011 En ligne : https://doi.org/10.1515/geocart-2016-0011 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83695 [article]

Shared Earth modeling / Michel Perrin (2013)

Public Titre : Shared Earth modeling : Knowledge driven solutions for building and managing subsurface 3D geological models Type de document : Monographie Auteurs : Michel Perrin, Éditeur scientifique ; Jean-François Rainaud, Éditeur scientifique Editeur : Paris : Technip Année de publication : 2013 Importance : 400 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-2-70108-1002-5 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géologie [Termes IGN] acquisition de connaissances [Termes IGN] découverte de connaissances [Termes IGN] géostatistique [Termes IGN] maille carrée [Termes IGN] maille triangulaire [Termes IGN] modèle géologique [Termes IGN] modèle numérique de sous-sol [Termes IGN] modélisation 3D [Termes IGN] modélisation géologique volumique (MGV) [Termes IGN] ontologie [Termes IGN] optimisation (mathématiques) [Termes IGN] primitive volumique [Termes IGN] prospection minérale [Termes IGN] prospection pétrolière [Termes IGN] reconstruction 3D [Termes IGN] séisme [Termes IGN] service web Index. décimale : 47.70 Géologie, minéralogie, pédologie Résumé : (Editeur) Over the last two decades, earth modeling has become a major investigative tool for evaluating the potential of hydrocarbon reservoirs. Earth modeling must now face new challenges since petroleum exploration no longer consists in only investigating newly identified resources, but also in re-evaluating the potential of previously investigated reservoirs in the light of new prospecting data and of revised interpretations. Earth models incorporate a variety of different interpretations made on various types of data at successive steps of the modeling process. However, current modeling procedures provide no way to link a range of data and interpretations with a final earth model. For this reason, sharing and exchanging information about the model building process is at present a major difficulty. Recently, the term "Shared Earth Modeling" has been used for expressing the idea that earth models should be built in such a way that experts and end users can have access, at any time, to all the information incorporated into the model.This information does not only concern the data, but also the knowledge that geoscientists produce by interpreting these data. Accordingly, practical solutions must be studied for operating a knowledge-driven approach of Shared Earth Modeling. This is the goal of this book. This study of earth subsurface modeling is intended for several categories of readers. It concerns in the first place geologists, engineers and managers involved in the study and evaluation of subsurface reservoirs and hydrocarbon exploration. Relying on recent progress in various fields of computer sciences, the authors present innovative solutions for solving the critical issue of knowledge exchange at key steps of the modeling process. This book will also be of interest to researchers in computer science and, more generally, to engineers, researchers and students who wish to apply advanced knowledge-based techniques to complex engineering problems. Note de contenu : 1 - Earth models 2 - Knowledge oriented solutions 3 - Knowledge formalization 4 - Knowledge management & applications Conclusion Numéro de notice : 21520 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90344

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The accuracy of grid digital elevation models linearly constructed from scattered sample data / F. Aguilar in International journal of geographical information science IJGIS, vol 20 n° 2 (february 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 2 (february 2006) . - pp 169 - 192 Titre : The accuracy of grid digital elevation models linearly constructed from scattered sample data Type de document : Article/Communication Auteurs : F. Aguilar, Auteur ; M. Aguilar, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 169 - 192 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] couple stéréoscopique [Termes IGN] écart type [Termes IGN] échantillonnage de données [Termes IGN] erreur d'échantillon [Termes IGN] erreur moyenne quadratique [Termes IGN] image aérienne [Termes IGN] interpolation linéaire [Termes IGN] maille carrée [Termes IGN] modèle numérique de surface [Termes IGN] modélisation 3D [Termes IGN] pente [Termes IGN] propagation d'erreur [Termes IGN] rugosité du sol [Termes IGN] système d'information géographique Résumé : (Auteur) In this paper, a theoretical-empirical model is developed for modelling the accuracy of a grid digital elevation model (DEM) linearly constructed from scattered sample data. The theoretical component integrates sample data accuracy in the model by means of the error-propagation theory. The empirical component seeks to model what is known as information loss, i.e. the sum of the error due purely to sampling the continuous terrain surface with a finite grid interval and the interpolation error. For this purpose, randomly spaced data points, supposed to be free of error, were converted into regularly gridded data points using triangulation with linear interpolation. Original sample data were collected with a 2 x 2 m sampling interval from eight different morphologies, from flat terrain to highly rugged terrain, applying digital photogrammetric methods to large-scale aerial stereo imagery (1 :5000). The DEM root mean square error was calculated by the true validation method over several sets of check points, obtaining the different sampling densities tested in this work. Several empirical models are calibrated and validated with the experimental data set by modelling the DEM accuracy by combining two variables such as sampling density and a descriptive attribute of terrain morphology. These empirical models presented a morphology based on the product of two potential functions, one related to the terrain roughness and another related to the sampling density. The terrain descriptors tested were average terrain slope, standard deviation of terrain slope, standard deviation of unitary vectors perpendicular to the topographic surface (SDUV), standard deviation of the difference in height between adjacent samples in the grid DEM (SDHD), and roughness estimation by first-, second-, or third-degree surface fitting error. The values obtained for those terrain descriptors were reasonably independent from the number and spatial distribution of the sample data. The models based on descriptors SDHD, SDUV, and standard deviation of slope provided a good fitting to the data observed (R 2> 0.94) in the calibration phase, model SDHD being the one that yielded the best results in validation. Therefore, it would be possible to establish a priori the optimum grid size required to generate or store a DEM of a particular accuracy, with the saving in computing time and file size that this would mean for the digital flow of the mapping information in GIS. Numéro de notice : A2006-066 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810500399670 En ligne : https://doi.org/10.1080/13658810500399670 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27793 [article]

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Preliminary study of Grid computing for remotely sensed information / Y. Xue in International Journal of Remote Sensing IJRS, vol 26 n° 16 (August 2005)  

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GIS and remote sensing as tools for the simulation of urban land-use change / C.M. Almeida in International Journal of Remote Sensing IJRS, vol 26 n° 4 (February 2005)  

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Examination of a constant-area quadrilateral grid in representation of global digital elevation models / J.T. Bjorke in International journal of geographical information science IJGIS, vol 18 n° 7 (november 2004)  

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Geometric variability of raster cell class assignment / A.M. Shortridge in International journal of geographical information science IJGIS, vol 18 n° 6 (october 2004)  

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Visualisation graphique WinMarthe / V. Hussenet (2004)

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Spatial raster data management for geo-information systems, a database perspective / Stephan Nebiker (1997)  

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Travaux sur modèles numériques de terrain, travaux sur la représentation du champ de pesanteur / Henri Marcel Dufour (1983)

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Relative relief map of Japan / H. Yamazaki in Annuaire international de cartographie, n° 11 (1971)

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