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Auteur K.C. Clarke |
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A multiscale masking method for point geographic data / K.C. Clarke in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)
[article]
Titre : A multiscale masking method for point geographic data Type de document : Article/Communication Auteurs : K.C. Clarke, Auteur Année de publication : 2016 Article en page(s) : pp 300 - 315 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] agrégation spatiale
[Termes IGN] C (langage)
[Termes IGN] droit privé
[Termes IGN] GeoTrans
[Termes IGN] Infrastructure de données
[Termes IGN] objet géographique ponctuel
[Termes IGN] protection de la vie privée
[Termes IGN] transformation de coordonnées
[Termes IGN] visualisation de donnéesRésumé : (auteur) This research introduces and tests a new masking technique for sensitive point-based geospatial data. The goal of masking is to allow data to be used for general measurements of spatial distributions, but to not permit the matching of points with their true underlying observations, usually street addresses, in order to protect identity and privacy. The proposed method first converts coordinates to the Military Grid Reference System (MGRS), then uses digit switching to mask coordinates. This permits encryption at five spatial levels of precision, equivalent to 1, 10, 100, 1000, and 10,000 m. Of the 1.3M possible digit switching combinations, one is chosen that minimizes the difference between the aggregate descriptive spatial statistics for the point set as a whole between the masked and the unmasked data. Most heavily weighted in the selection is the nearest neighbor statistic, a measure of clustering in the distribution. The masking method was implemented for point sets within a single MGRS cell square using NGA’s GEOTRANS software and new custom C language code, with both forward and inverse algorithms. The forward masking saves the translation code in a separate file without which the inversion is practically impossible, meaning that the masked data can be offered publicly. Four test point distributions were used to show the method in action. The method appears to offer new possibilities for the protection of sensitive geospatial data. Numéro de notice : A2016-089 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1085540 En ligne : https://doi.org/10.1080/13658816.2015.1085540 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79874
in International journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 300 - 315[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-2016011 RAB Revue Centre de documentation En réserve L003 Disponible Decreasing computational time of urban cellular automata through model portability / C. Dietzel in Geoinformatica, vol 10 n° 2 (June - August 2006)
[article]
Titre : Decreasing computational time of urban cellular automata through model portability Type de document : Article/Communication Auteurs : C. Dietzel, Auteur ; K.C. Clarke, Auteur Année de publication : 2006 Article en page(s) : pp 197 - 211 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] automate cellulaire
[Termes IGN] échantillonnage
[Termes IGN] efficacité
[Termes IGN] portabilité
[Termes IGN] système d'exploitation
[Termes IGN] traitement automatique de donnéesRésumé : (Auteur) This paper investigates how portability of a model between different computer operating Systems can lead to increased efficiency in code execution. The portability problem is not a trivial one, as many geographic models are designed to be run inside a set environment (Unix, Solaris, Linux, and Windows), and are further limited by hardware constraints. The SLEUTH urban growth model [K.C Clarke, S. Hoppen, and L. Gaydos. "A self-modifying cellular automaton model of historical urbanization in the San Francisco Bay area", Environment and Planning B, 24:247-261, 1997] was implemented under three different operating Systems (Solaris, Linux, and Windows). Results suggest that the model's performance is optimized by porting it from its original environment (Unix/Solaris) to Linux or Windows where faster processors are available. While the results show optimization of model performance, there are some suggestions of computational bottlenecks that may eventually limit the increased performance of the model. Regardless, the research demonstrates that the portability of a model can lead to not only to a de-crease in computation time, but may increase the viability in practical applications and attract a wider user base. Copyright Springer Numéro de notice : A2006-216 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-006-7579-0 En ligne : https://doi.org/10.1007/s10707-006-7579-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27943
in Geoinformatica > vol 10 n° 2 (June - August 2006) . - pp 197 - 211[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 057-06021 RAB Revue Centre de documentation En réserve L003 Disponible An artificial-neural-network-based, constrained CA model for simulating urban growth / Q. Guan in Cartography and Geographic Information Science, vol 32 n° 4 (October 2005)
[article]
Titre : An artificial-neural-network-based, constrained CA model for simulating urban growth Type de document : Article/Communication Auteurs : Q. Guan, Auteur ; L. Wang, Auteur ; K.C. Clarke, Auteur Année de publication : 2005 Article en page(s) : pp 369 - 380 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] automate cellulaire
[Termes IGN] croissance urbaine
[Termes IGN] données localisées
[Termes IGN] modèle mathématique
[Termes IGN] occupation du sol
[Termes IGN] Pékin (Chine)
[Termes IGN] réseau neuronal artificiel
[Termes IGN] simulationRésumé : (Auteur) Insufficient research has been done on integrating artificial-neural-network-based cellular automata (CA) models and constrained CA models, even though both types have been studied for several years. In this paper, a constrained CA model based on an artificial neural network (ANN) was developed to simulate and forecast urban growth. Neural networks can learn from available urban land-use geospatial data and drus deal with redundancy, inaccuracy, and noise during the CA parameter calibration. In the ANN-Urban-CA model we used, a two-layer Back-Propagation (BP) neural network bas been integrated into a CA model to seek suitable parameter values that match the historical data. Each cell's probability of urban transformation is determined by the neural network during simulation. A macro-scale socio-economic model was run together with the CA model to estimate demand to urban space in each period in the future. The total number of new urban cells generated by the CA model was constrained, taking such exogenous demands as population forecasts into account. Beijing urban growth between 1980 and 2000 was simulated using this model, and long-term (2001-2015) growth was forecast based on multiple socio-economic scenarios. The ANN-Urban-CA model was found capable of simulating and forecasting the complex and non-linear spatial-temporal process of urban growth in a reasonably short time, with less subjective uncertainty. Numéro de notice : A2005-539 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304005775194746 En ligne : https://doi.org/10.1559/152304005775194746 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27675
in Cartography and Geographic Information Science > vol 32 n° 4 (October 2005) . - pp 369 - 380[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-05041 RAB Revue Centre de documentation En réserve L003 Disponible Spatio-temporal dynamics in California's central valley: empirical links to urban theory / C. Dietzel in International journal of geographical information science IJGIS, vol 19 n° 2 (february 2005)
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Titre : Spatio-temporal dynamics in California's central valley: empirical links to urban theory Type de document : Article/Communication Auteurs : C. Dietzel, Auteur ; Martin Herold, Auteur ; J.J. Hemphill, Auteur ; K.C. Clarke, Auteur Année de publication : 2005 Article en page(s) : pp 175 - 195 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse spatiale
[Termes IGN] Californie (Etats-Unis)
[Termes IGN] classification barycentrique
[Termes IGN] croissance urbaine
[Termes IGN] densité de population
[Termes IGN] échelle géographique
[Termes IGN] modèle conceptuel de données spatio-temporelles
[Termes IGN] population urbaine
[Termes IGN] spatial metrics
[Termes IGN] urbanisation
[Termes IGN] villeRésumé : (Auteur) This paper explores an addition to theory in urban geography pertaining to spatio-temporal dynamics. Remotely sensed data on the historical extent of urban areas were used in a spatial metrics analysis of geographical form of towns and cities in the Central Valley of California (USA). Regularities in the spatiotemporal pattern of urban growth were detected and characterized over a hundred year period. To test hypotheses about variation over geographical scale, multiple spatial extents were used in examining a set of spatial metric values including an index of contagion, the mean nearest neighbor distance, urban patch density and edge density. Through changes in these values a general temporal oscillation between phases of diffusion and coalescence in urban growth was revealed. Analysis of historical datasets revealed preliminary evidence supporting an addition to the theory of urban growth dynamics, one alluded to in some previous research, but not well developed. The empirical results and findings provide a lead for future research into the dynamics of urban growth and further development of existing urban theory. Numéro de notice : A2005-047 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810410001713407 En ligne : https://doi.org/10.1080/13658810410001713407 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27185
in International journal of geographical information science IJGIS > vol 19 n° 2 (february 2005) . - pp 175 - 195[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-05021 RAB Revue Centre de documentation En réserve L003 Disponible 079-05022 RAB Revue Centre de documentation En réserve L003 Disponible vol 31 n° 3 - July 2004 - Mobile mapping and Geographic Information Systems (Bulletin de Cartography and Geographic Information Science) / Cartography and geographic information society
[n° ou bulletin]
est un bulletin de Cartography and Geographic Information Science / Cartography and geographic information society (1999 -)
Titre : vol 31 n° 3 - July 2004 - Mobile mapping and Geographic Information Systems Type de document : Périodique Auteurs : Cartography and geographic information society, Auteur ; K.C. Clarke, Auteur Année de publication : 2004 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie
[Termes IGN] SIG nomade
[Termes IGN] système de numérisation mobileNuméro de notice : 032-0403 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Numéro de périodique En ligne : http://www.ingentaconnect.com/content/cagis/cagis/2003/00000030/00000004;jsessio [...] Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=21390 [n° ou bulletin]Contient
- Flexibility by design: how mobile GIS meets the needs of archaeological survey / N. Tripcevich in Cartography and Geographic Information Science, vol 31 n° 3 (July 2004)
- Integrated mobile GIS and wireless internet map servers for environnemental monitoring and management / M.H. Tsou in Cartography and Geographic Information Science, vol 31 n° 3 (July 2004)
- GQMAP: improving performance and productivity of mobile mapping systems through GPS quality of service / Hassan A. Karimi in Cartography and Geographic Information Science, vol 31 n° 3 (July 2004)
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Code-barres Cote Support Localisation Section Disponibilité 032-04031 RAB Revue Centre de documentation En réserve L003 Disponible Spatial metrics and image texture for mapping urban land use / Martin Herold in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 9 (September 2003)PermalinkA new world geographic reference system / K.C. Clarke in Cartography and Geographic Information Science, vol 29 n° 4 (October 2002)Permalink