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A complete classification of topological relations using the 9-intersection method / S. Li in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 589 - 610 Titre : A complete classification of topological relations using the 9-intersection method Type de document : Article/Communication Auteurs : S. Li, Auteur Année de publication : 2006 Article en page(s) : pp 589 - 610 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] géométrie euclidienne [Termes IGN] objet géographique complexe [Termes IGN] raisonnement spatial [Termes IGN] relation topologique Résumé : (Auteur) Formalization of topological relations between spatial objects is an important aspect of spatial representation and reasoning. The well-known 9-Intersection Method (9IM) was previously used to characterize topological relations between simple regions, i.e. regions with connected boundary and exterior. This simplified abstraction of spatial objects as simple regions cannot model the variety and complexity of spatial objects. For example, countries like Italy may contain islands and holes. It is necessary that existing formalisms, 9IM in particular, cover this variety and complexity. This paper generalizes 9IM to cope with general regions, where a (general) region is a non-empty proper regular closed subset of the Euclidean plane. We give a complete classification of topological relations between plane regions. For each possible relation we either show that it violates some topological constraints and hence is non-realizable or find two plane regions it relates. Altogether 43 (out of 512) relations are identified as realizable. Among these, five can be realized only between exotic (plane) regions, where a region is exotic if there is another region that has the same boundary but is not its complement. For all the remaining 38 relations, we construct configurations by using sums, differences and complements of discs. Copyright Taylor & Francis Numéro de notice : A2006-236 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600661383 En ligne : https://doi.org/10.1080/13658810600661383 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27963 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06062	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Creating a hydrographic network from its cartographic representation: a case study using Ordnance Survey mastermap data / Nicolas Regnauld in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 611 - 631 Titre : Creating a hydrographic network from its cartographic representation: a case study using Ordnance Survey mastermap data Type de document : Article/Communication Auteurs : Nicolas Regnauld , Auteur ; William A Mackaness, Auteur Année de publication : 2006 Article en page(s) : pp 611 - 631 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] axe médian [Termes IGN] carte numérisée [Termes IGN] cartographie automatique [Termes IGN] cartographie numérique [Termes IGN] eau de surface [Termes IGN] grande échelle [Termes IGN] Grande-Bretagne [Termes IGN] incertitude géométrique [Termes IGN] modèle numérique de surface [Termes IGN] Ordnance Survey of Great Britain [Termes IGN] réseau hydrographique [Termes IGN] squelettisation [Termes IGN] zone rurale [Termes IGN] zone urbaine Résumé : (Auteur) A meaningful hydrological network is critical to spatial analysis and modelling. 'Meaningful' in that it is topologically correct, provides a basis for modelling flow and differentiates between different types of water features. In Great Britain, large-scale digital mapping of hydrological features was captured from paper maps and had a cartographic emphasis that had poor attribution, and no underlying model that supported geographical modelling. This emphasis gave rise to rivers and lakes that were variously 'broken' into sections by features such as dams, bridges, and culverts. This paper reports on research to create automatically a topologically connected hydrological network that underpins the detailed cartographic representation of such features. The network was created by joining these hydrographic features together according to rules of both continuity and proximity between river sections, and their flow direction (using an underlying digital elevation model). Confidence values were associated with each section link reflecting the certainty of that connection. The confidence values provided a basis for directing human intervention to uncertain connections as part of the final editing process. The project took as its input OS MasterMap 'water feature' data. A skeletonisation process was used to create the medial axis of the network. The paper reports in detail the methodology, the implementation and evaluation. The algorithm worked well in rural areas where interruptions are small and there is greater variation in height. In urban areas the challenges were greater where typically relatively long sections of river may be re-engineered and culverted, and where the fidelity of the digital elevation model was insufficient to discern the subtle changes in elevation. Copyright Taylor & Francis Numéro de notice : A2006-237 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600607402 En ligne : https://doi.org/10.1080/13658810600607402 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27964 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06062	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Method for detecting apparent differences between spatial tessellations at different time points / A. Masuyama in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 633 - 648 Titre : Method for detecting apparent differences between spatial tessellations at different time points Type de document : Article/Communication Auteurs : A. Masuyama, Auteur Année de publication : 2006 Article en page(s) : pp 633 - 648 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] analyse diachronique [Termes IGN] appariement de formes [Termes IGN] appariement de graphes [Termes IGN] détection de changement [Termes IGN] fusion de données multisource [Termes IGN] tessellation Résumé : (Auteur) This paper proposes methods for detecting apparent differences between spatial tessellations at two different points in time, with the objective of conflation of spatial tessellations at multiple time points. The methods comprise three steps. First, we eliminate systematic differences between tessellations using the affine transformation. Second, we match subregions between tessellations at two points in time and match boundaries based on matching relationships between the subregions. Third, we propose a distance metric for measuring differences between the matched boundaries and a method for determining whether the measured differences are apparent or not. We apply the proposed methods to a part of the US Census data for 1990 and 2000 and empirically demonstrate the effectiveness of these methods. Numéro de notice : A2006-238 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600661300 En ligne : https://doi.org/10.1080/13658810600661300 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27965 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06062	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Population landscape: a geometric approach to studying spatial patterns of the US urban hierarchy / L. Mu in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 649 - 667 Titre : Population landscape: a geometric approach to studying spatial patterns of the US urban hierarchy Type de document : Article/Communication Auteurs : L. Mu, Auteur ; X. Wang, Auteur Année de publication : 2006 Article en page(s) : pp 649 - 667 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse de groupement [Termes IGN] contour [Termes IGN] démographie [Termes IGN] diagramme de Voronoï [Termes IGN] données socio-économiques [Termes IGN] Etats-Unis [Termes IGN] métropole [Termes IGN] objet géographique [Termes IGN] population urbaine Résumé : (Auteur) We present a geometric and graphic approach to studying spatial patterns of urban hierarchy in the US. The multiplicatively weighted Voronoï diagram is found to be effective for visualizing theoretical regions delineated by socio-economic variables. The population landscape of the continental US demonstrates overall and stepwise patterns reflecting population, neighborhood and distance, with overwhelming influence from huge metropolitan areas. Stepwise exploration and cluster analysis of the spatial pattern reveal an urban hierarchy. Attributes and arrangement are the two important factors of urban hierarchy, with attribute having a stronger local influence and arrangement having a stronger global influence. The study also presents a variation of Zipf's law to visualize the rank-size distribution from tabular and statistical space to map. Copyright Taylor & Francis Numéro de notice : A2006-239 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600661342 En ligne : https://doi.org/10.1080/13658810600661342 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27966 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06062	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Sensitivity of channel mapping techniques to uncertainty in digital elevation data / J.B. Lindsay in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 669 - 692 Titre : Sensitivity of channel mapping techniques to uncertainty in digital elevation data Type de document : Article/Communication Auteurs : J.B. Lindsay, Auteur Année de publication : 2006 Article en page(s) : pp 669 - 692 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] cartographie automatique [Termes IGN] données lidar [Termes IGN] incertitude géométrique [Termes IGN] modèle numérique de surface [Termes IGN] réseau de drainage [Termes IGN] réseau hydrographique Résumé : (Auteur) Digital elevation data are now commonly used to map channel networks automatically. This paper evaluates the sensitivity of six methods of extracting channel networks from digital elevation models (DEMs) to elevation error. As such, the robustness of channel mapping techniques against noisy data was evaluated and not the accuracy of DEM extracted channel networks. Stochastic simulations were used in combination with a fine-resolution LiDAR DEM of a small upland catchment to assess the robustness of each of the channel mapping algorithms. Findings showed that the four tested methods that were based on identifying patterns or positions in the surface morphology were more sensitive to elevation error than the two methods that were based on simulating overland flow and channelization processes, particularly at lower error magnitudes. While the morphology-based channel-mapping methods were highly sensitive to the degree of spatial autocorrelation in elevation error fields, the channelization based methods were relatively insensitive. Drainage network extent and the geometry of exterior stream channels were both found to be greatly influenced by low to moderate degrees of topographic error. Although LiDAR data were found to provide a sufficient resolution for mapping fine-scale headwater channels, the greater surface roughness did present challenges for automated channel-mapping techniques. Copyright Taylor & Francis Numéro de notice : A2006-240 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600661433 En ligne : https://doi.org/10.1080/13658810600661433 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27967 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-06061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-06062	RAB	Revue	Centre de documentation	En réserve L003	Disponible