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Developing collaborative classifiers using an Expert-based Model / Giorgos Mountrakis in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 7 (July 2009)
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Titre : Developing collaborative classifiers using an Expert-based Model Type de document : Article/Communication Auteurs : Giorgos Mountrakis, Auteur ; R. Watts, Auteur ; L. Luo, Auteur ; Jing Wang, Auteur Année de publication : 2009 Article en page(s) : pp 831 - 843 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] classificateur
[Termes IGN] classification à base de connaissances
[Termes IGN] image Landsat
[Termes IGN] Las Vegas
[Termes IGN] mise à l'échelle
[Termes IGN] précision de la classification
[Termes IGN] surface imperméable
[Termes IGN] système expertRésumé : (Auteur) This paper presents a hierarchical, multi-stage adaptive strategy for image classification. We iteratively apply various classification methods (e.g., decision trees, neural networks), identify regions of parametric and geographic space where accuracy is low, and in these regions, test and apply alternate methods repeating the process until the entire image is classified. Currently, classifiers are evaluated through human input using an expert-based system; therefore, this paper acts as the proof of concept for collaborative classifiers. Because we decompose the problem into smaller, more manageable sub-tasks, our classification exhibits increased flexibility compared to existing methods since classification methods are tailored to the idiosyncrasies of specific regions. A major benefit of our approach is its scalability and collaborative support since selected low-accuracy classifiers can be easily replaced with others without affecting classification accuracy in high accuracy areas. At each stage, we develop spatially explicit accuracy metrics that provide straightforward assessment of results by non-experts and point to areas that need algorithmic improvement or ancillary data. Our approach is demonstrated in the task of detecting impervious surface areas, an important indicator for human-induced alterations to the environment, using a 2001 Landsat scene from Las Vegas, Nevada. Copyright ASPRS Numéro de notice : A2009-263 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.75.7.831 En ligne : https://doi.org/10.14358/PERS.75.7.831 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29893
in Photogrammetric Engineering & Remote Sensing, PERS > vol 75 n° 7 (July 2009) . - pp 831 - 843[article]A GeoAgent-based framework for knowledge-oriented representation: embracing social rules in GIS / C. Yu in International journal of geographical information science IJGIS, vol 23 n° 7-8 (july 2009)
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Titre : A GeoAgent-based framework for knowledge-oriented representation: embracing social rules in GIS Type de document : Article/Communication Auteurs : C. Yu, Auteur ; Donna J. Peuquet, Auteur Année de publication : 2009 Article en page(s) : pp 923 - 960 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] agent (intelligence artificielle)
[Termes IGN] base de connaissances
[Termes IGN] base de règles
[Termes IGN] cadre conceptuel
[Termes IGN] interaction homme-milieu
[Termes IGN] modèle conceptuel de données localisées
[Termes IGN] Pennsylvanie (Etats-Unis)
[Termes IGN] prototype
[Termes IGN] représentation des connaissances
[Termes IGN] système à base de connaissances
[Termes IGN] système multi-agentsRésumé : (Auteur) While current Geographic Information Systems (GISs) can represent observational spatial data well, they have limited capabilities in representing some non-observational social elements and goal-driven behaviours that can be important factors in a wide range of geographic issues. Such social components may include laws, regulations, polices, plans, culture, and customs, as well as their relations and interactions with the geographic environment at different scales. Getting beyond traditional data-centred approaches, this research presents a knowledge-oriented strategy in order to address these issues within a GIS context. We incorporate two major conceptual elements. First, extending from conventional agent notions and their geographic applications, geographic agents (GeoAgents) are considered as a basic representation component to specifically address social rules and goal-driven behaviours that impact the Earth and environmental systems. Second, in order to incorporate GeoAgents with current space-time representation, a new conceptual representation framework, called 'fields, objects, time, GeoAgents, and relations' (FOTAR), is introduced to address the cross-scale processes of both social and natural interactions. A Java-based prototype, GeoAgent-based Knowledge System (GeoAgentKS), is described to implement this framework by integrating agent technologies with multiple data and knowledge representation techniques, such as expert systems, concept maps, mathematical models, and geospatial databases. The application of this prototype in a case study is also presented, investigating scale-dependent human-environment interactions under different emergency situations for community water systems in Central Pennsylvania, USA. In this case study, a systematic set of methodologies of knowledge acquisition, representation, and confirmation for constructing GeoAgents' knowledge bases by using expert systems were explored to formalize high-level knowledge and social behaviours in the FOTAR-based representations. The results show that the proposed conceptual representation framework is achievable at both implementation and application levels, and the prototype tool is demonstrated to be valuable in facilitating knowledge sharing, policymaking, municipal management, and decision-making, especially for real-world emergency management. Copyright Taylor & Francis Numéro de notice : A2009-341 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810701602104 En ligne : https://doi.org/10.1080/13658810701602104 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29971
in International journal of geographical information science IJGIS > vol 23 n° 7-8 (july 2009) . - pp 923 - 960[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-09051 RAB Revue Centre de documentation En réserve L003 Disponible 079-09052 RAB Revue Centre de documentation En réserve L003 Disponible Louisiana wetland water level monitoring using retracked Topex-Poseidon altimetry / H. Lee in Marine geodesy, vol 32 n° 3 (July - September 2009)
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Titre : Louisiana wetland water level monitoring using retracked Topex-Poseidon altimetry Type de document : Article/Communication Auteurs : H. Lee, Auteur ; Alexander Braun, Auteur ; C.Y. Kuo, Auteur ; Zhong Lu, Auteur Année de publication : 2009 Article en page(s) : pp 284 - 302 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] données altimétriques
[Termes IGN] données multitemporelles
[Termes IGN] données Topex-Poseidon
[Termes IGN] Louisiane (Etats-Unis)
[Termes IGN] marais
[Termes IGN] rivière
[Termes IGN] surveillance hydrologiqueRésumé : (Auteur) Previous studies using satellite radar altimetry to observe inland river and wetland water level changes usually spatially average high-rate (10-Hz for TOPEX, 18-Hz for Envisat) measurements. Here we develop a technique to apply retracking of TOPEX waveforms by optimizing the estimated retracked gate positions using the Offset Center of Gravity retracker. This study, for the first time, utilizes stacking of retracked TOPEX data over Louisiana wetland and concludes that the water level observed by each of 10-Hz data with along-track sampling of ~660 m exhibit variations, indicating detection of wetland dynamics. After further validations using nearby river gauges, we conclude that TOPEX is capable of measuring accurate water level changes beneath heavy-vegetation canopy region (swamp forest), and that it revealed wetland dynamic flow characteristics along track with spatial scale of 660 m or longer. Copyright Taylor & Francis Numéro de notice : A2009-449 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/01490410903094767 En ligne : https://doi.org/10.1080/01490410903094767 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30080
in Marine geodesy > vol 32 n° 3 (July - September 2009) . - pp 284 - 302[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 230-09031 RAB Revue Centre de documentation En réserve L003 Disponible Observations of urban and suburban environments with global satellite scatterometer data / Son V. Nghiem in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 4 (July - August 2009)
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Titre : Observations of urban and suburban environments with global satellite scatterometer data Type de document : Article/Communication Auteurs : Son V. Nghiem, Auteur ; D. Balk, Auteur Année de publication : 2009 Article en page(s) : pp 367 - 380 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] banlieue
[Termes IGN] Bogota (Colombie)
[Termes IGN] Canton (Kouangtoung)
[Termes IGN] Dallas (Texas)
[Termes IGN] densité de population
[Termes IGN] densité du bâti
[Termes IGN] détection de contours
[Termes IGN] Dhaka (Bangladesh)
[Termes IGN] diffusomètre
[Termes IGN] échantillonnage d'image
[Termes IGN] éclairage public
[Termes IGN] image Landsat-ETM+
[Termes IGN] milieu urbain
[Termes IGN] Phoenix
[Termes IGN] Quito (Equateur)
[Termes IGN] télédétection en hyperfréquenceRésumé : (Auteur) A global and consistent characterization of land use and land change in urban and suburban environments is crucial for many fundamental social and natural science studies and applications. Presented here is a dense sampling method (DSM) that uses satellite scatterometer data to delineate urban and intraurban areas at a posting scale of about 1 km. DSM results are analyzed together with information on population and housing censuses, with Landsat Enhanced Thematic Mapper Plus (ETM+) imagery, and with Defense Meteorological Satellite Program (DMSP) night-light data. The analyses include Dallas-Fort Worth and Phoenix in the United States, Bogotá in Colombia, Dhaka in Bangladesh, Guangzhou in China, and Quito in Ecuador. Results show that scatterometer signatures correspond to buildings and infrastructures in urban and suburban environments. City extents detected by scatterometer data are significantly smaller than city light extents, but not all urban areas are detectable by the current SeaWinds scatterometer on the QuikSCAT satellite. Core commercial and industrial areas with high buildings and large factories are identified as high-backscatter centers. Data from DSM backscatter and DMSP nighttime lights have a good correlation with population density. However, the correlation relations from the two satellite datasets are different for different cities indicating that they contain complementary information. Together with night-light and census data, DSM and satellite scatterometer data provide new observations to study global urban and suburban environments and their changes. Furthermore, the capability of DSM to identify hydrological channels on the Greenland ice sheet and ecological biomes in central Africa demonstrates that DSM can be used to observe persistent structures in natural environments at a km scale, providing contemporaneous data to study human impacts beyond urban and suburban areas. Copyright ISPRS Numéro de notice : A2009-295 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.01.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.01.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29925
in ISPRS Journal of photogrammetry and remote sensing > vol 64 n° 4 (July - August 2009) . - pp 367 - 380[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-09041 SL Revue Centre de documentation Revues en salle Disponible Comparative analysis of SRTM-NED vegetation canopy height to LIDAR-derived vegetation canopy metrics / L. Kenyi in International Journal of Remote Sensing IJRS, vol 30 n°11-12 (June 2009)
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Titre : Comparative analysis of SRTM-NED vegetation canopy height to LIDAR-derived vegetation canopy metrics Type de document : Article/Communication Auteurs : L. Kenyi, Auteur ; R. Dubayah, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 2797 - 2811 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse comparative
[Termes IGN] arbre (flore)
[Termes IGN] Californie (Etats-Unis)
[Termes IGN] canopée
[Termes IGN] climat de montagne
[Termes IGN] données lidar
[Termes IGN] flore locale
[Termes IGN] hauteur des arbres
[Termes IGN] MNS SRTMRésumé : (Auteur) Vegetation canopy heights derived from the SRTM 30 m grid DEM minus USGS National Elevation Data (NED) DTM were compared to three vegetation metrics derived from a medium footprint LIDAR data (LVIS) for the US Sierra Nevada forest in California. Generally the SRTM minus NED was found to underestimate the vegetation canopy height. Comparing the SRTM-NED-derived heights as a function of the canopy percentile height (shape/vertical structure) derived from LVIS, the SRTM SAR signal was found to penetrate, on average, into about 44% of the canopy and 85% after adjustment of the data. On the canopy type analysis, it was found that the SRTM phase scattering centres occurred at 60% for red fir, 53% for Sierra mixed conifer, 50% for ponderosa pine and 50% for montane hardwood-conifer. Whereas analysing the residual errors of the SRTM-NED minus the LVIS-derived canopy height as a function of LVIS canopy height and cover it was observed that the residuals generally increase with increasing canopy height and cover. Likewise, the behaviour of the RMSE as a function of canopy height and cover was observed to initially increase with canopy height and cover but saturates at 50 m canopy height and 60% canopy cover. On the other hand, the behaviour of the correlation coefficient as a function of canopy height and cover was found to be high at lower canopy height (15 m and 20% and Numéro de notice : A2009-257 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160802555853 En ligne : https://doi.org/10.1080/01431160802555853 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29887
in International Journal of Remote Sensing IJRS > vol 30 n°11-12 (June 2009) . - pp 2797 - 2811[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-09071 RAB Revue Centre de documentation En réserve L003 Disponible Landsat sub-pixel analysis in mapping impact of climatic variability on prairie pothole changes / B. Zhang in Transactions in GIS, vol 13 n° 2 (April 2009)
PermalinkMorphology-based building detection from airborne Lidar data / X. Meng in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 4 (April 2009)
PermalinkThe effects of quality control on decreasing error propagation in the LandScan USA population distribution model: a case study of Philadelphia County / L. Patterson in Transactions in GIS, vol 13 n° 2 (April 2009)
PermalinkAssessing spatial uncertainty of LIDAR-derived building model: a case study in downtown Oklahoma city / M. Cheuk in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 3 (March 2009)
PermalinkDevelopment of comprehensive geodetic vertical datums for the United States Pacific Territories of American Samoa, Guam, and the Northern Marianas / E. Carlson in SaLIS Surveying and land information science, vol 69 n° 1 (March 2009)
PermalinkFinding shortest paths on real road networks: the case for A* / W. Zeng in International journal of geographical information science IJGIS, vol 23 n°3-4 (march - april 2009)
PermalinkMapping vegetated wetlands of Alaska using L-band radar satellite imagery / Jane Whitcomb in Canadian journal of remote sensing, vol 35 n° 1 (February 2009)
PermalinkNew perspectives on the use of GPS and GIS to support a highway performance study / D. Tong in Transactions in GIS, vol 13 n° 1 (February 2009)
PermalinkUsing ENVISAT ASAR global mode data for surface soil moisture retrieval over Oklahoma, USA / Carsten Pathe in IEEE Transactions on geoscience and remote sensing, vol 47 n° 2 (February 2009)
PermalinkFeature reduction using a singular value decomposition for the iterative guided spectral class rejection hybrid classifier / R. Philipps in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 1 (January - February 2009)
PermalinkArcGIS seabed characterization toolbox developed for investigating benthic habitats / M. Erdey-Heydorn in Marine geodesy, vol 31 n° 4 (December 2008)
PermalinkOrthoimage creation of extremely high buildings / Guoqing Zhou in IEEE Transactions on geoscience and remote sensing, vol 46 n° 12 (December 2008)
PermalinkDesign and implementation of a Model, Web-based, GIS-enabled cancer atlas / Alan M. MacEachren in Cartographic journal (the), vol 45 n° 4 (November 2008)
PermalinkFuzzy inference guided cellular automata urban-growth modelling using multi-temporal satellite images / S. Al-Kheder in International journal of geographical information science IJGIS, vol 22 n°11-12 (november 2008)
PermalinkAutomated conflation of digital gazetteer data / J.T. Hastings in International journal of geographical information science IJGIS, vol 22 n° 10 (october 2008)
PermalinkModelling house unit density from land cover metrics: a Midwestern US example / P. Hardin in Geocarto international, vol 23 n° 5 (October - November 2008)
PermalinkGeometric integration of aerial and high-resolution satellite imagery and application in shoreline mapping / R. Li in Marine geodesy, vol 31 n° 3 (September - November 2008)
PermalinkEffects of DEM resolution and source on soil erosion modelling: a case study using the WEPP model / J.X. Zhang in International journal of geographical information science IJGIS, vol 22 n° 8-9 (august 2008)
PermalinkEstuarine shoreline change detection using Japanese ALOS PALSAR HH and JERS-1 L-HH SAR data in the Albemarle-Pamlico Sounds, North Carolina, USA / Y. Wang in International Journal of Remote Sensing IJRS, vol 29 n° 15-16 (August 2008)
PermalinkSpatial optimization as a generative technique for sustainable multiobjective land-use allocation / A. Ligmann-Zielinska in International journal of geographical information science IJGIS, vol 22 n° 6-7 (june 2008)
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