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A rapid approach for automated comparison of independently derived stream networks / Lauwrence V. Stanislawski in Cartography and Geographic Information Science, Vol 42 n° 5 (November 2015)
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Titre : A rapid approach for automated comparison of independently derived stream networks Type de document : Article/Communication Auteurs : Lauwrence V. Stanislawski, Auteur ; Barbara P. Buttenfield, Auteur ; Ariel Doumbouya, Auteur Année de publication : 2015 Article en page(s) : pp 435 - 448 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse comparative
[Termes IGN] base de données hydrographiques
[Termes IGN] bassin hydrographique
[Termes IGN] cartographie des flux
[Termes IGN] modélisation spatiale
[Termes IGN] réseau hydrographiqueRésumé : (Auteur) This paper presents an improved coefficient of line correspondence (CLC) metric for automatically assessing the similarity of two different sets of linear features. Elevation-derived channels at 1:24,000 scale (24K) are generated from a weighted flow-accumulation model and compared to 24K National Hydrography Dataset (NHD) flowlines. The CLC process conflates two vector datasets through a raster line-density differencing approach that is faster and more reliable than earlier methods. Methods are tested on 30 subbasins distributed across different terrain and climate conditions of the conterminous United States. CLC values for the 30 subbasins indicate 44–83% of the features match between the two datasets, with the majority of the mismatching features comprised of first-order features. Relatively lower CLC values result from subbasins with less than about 1.5 degrees of slope. The primary difference between the two datasets may be explained by different data capture criteria. First-order, headwater tributaries derived from the flow-accumulation model are captured more comprehensively through drainage area and terrain conditions, whereas capture of headwater features in the NHD is cartographically constrained by tributary length. The addition of missing headwaters to the NHD, as guided by the elevation-derived channels, can substantially improve the scientific value of the NHD. Numéro de notice : A2015-560 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/15230406.2015.1060869 En ligne : https://doi.org/10.1080/15230406.2015.1060869 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77602
in Cartography and Geographic Information Science > Vol 42 n° 5 (November 2015) . - pp 435 - 448[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-2015051 RAB Revue Centre de documentation En réserve L003 Disponible Application of fuzzy combination operators to flood vulnerability assessments in Seoul, Korea / Moung-Jin Lee in Geocarto international, vol 30 n° 9 - 10 (October - November 2015)
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Titre : Application of fuzzy combination operators to flood vulnerability assessments in Seoul, Korea Type de document : Article/Communication Auteurs : Moung-Jin Lee, Auteur ; Jung Eun Kang, Auteur ; Geunhan Kim, Auteur Année de publication : 2015 Article en page(s) : pp 1052 - 1075 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] changement climatique
[Termes IGN] classification floue
[Termes IGN] évaluation des données
[Termes IGN] inondation
[Termes IGN] Séoul
[Termes IGN] système d'information géographique
[Termes IGN] zone inondableRésumé : (Auteur) The goal of this study was to apply, verify and compare fuzzy models with various fuzzy combination operators to analyze the vulnerability to flooding in Seoul, Korea, and to create flood vulnerability maps. We employed the IPCC concept of vulnerability, which comprises exposure to climate, sensitivity and the adaptive capacity, to identify factors that influence flooding. Eleven factors were compiled in a spatial database using geographical information system. The relative weight of each factor was converted into a fuzzy membership value, which was integrated to obtain a flood vulnerability index using five fuzzy combination operators (fuzzy AND, fuzzy OR, fuzzy algebraic sum, fuzzy algebraic product and fuzzy gamma). Overall, the fuzzy models were quite effective tools for flood vulnerability assessment. Of the five fuzzy combination operators, the fuzzy AND operator obtained the highest prediction accuracy of 88.68%. This study achieved better flood vulnerability assessments by employing and comparing fuzzy combination operators. Numéro de notice : A2015-629 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2015.1027290 Date de publication en ligne : 01/04/2015 En ligne : http://www.tandfonline.com/doi/full/10.1080/10106049.2015.1027290 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78112
in Geocarto international > vol 30 n° 9 - 10 (October - November 2015) . - pp 1052 - 1075[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-2015051 RAB Revue Centre de documentation En réserve L003 Disponible
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Titre : Ciel sous contrôle : enquête SIG et climat Type de document : Article/Communication Auteurs : Steve Carpentier, Auteur ; Hubert d' Erceville, Auteur Année de publication : 2015 Article en page(s) : pp 18 - 25 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse spatio-temporelle
[Termes IGN] cartographie des risques
[Termes IGN] catastrophe naturelle
[Termes IGN] données localisées 3D
[Termes IGN] inondation
[Termes IGN] météorologie
[Termes IGN] outil d'aide à la décision
[Termes IGN] prévention des risques
[Termes IGN] tempêteRésumé : (auteur) La cartographie des zones à risque est devenue la pièce maîtresse de la prévention des catastrophes naturelles. La modélisation et le couplage de grandes quantités de données météorologiques et géographiques permettent de repérer les fragilités territoriales, et d'agir en conséquence avant qu'il ne soit trop tard. Numéro de notice : A2015-640 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78133
in SIGmag > n° 6 (octobre 2015) . - pp 18 - 25[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 147-2015062 RAB Livre Centre de documentation En réserve L003 Disponible 147-2015061 RAB Revue Centre de documentation En réserve L003 Disponible Efficiently computing the drainage network on massive terrains using external memory flooding process / Thiago L. Gomes in Geoinformatica, vol 19 n° 4 (October - December 2015)
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Titre : Efficiently computing the drainage network on massive terrains using external memory flooding process Type de document : Article/Communication Auteurs : Thiago L. Gomes, Auteur ; Salles V. G. Magalhães, Auteur ; Marcus V. A. Andrade, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 671 - 692 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique
[Termes IGN] écoulement des eaux
[Termes IGN] hydrologie
[Termes IGN] modèle numérique de terrain
[Termes IGN] réseau d'irrigation
[Termes IGN] système d'information géographiqueRésumé : (auteur) We present EMFlow, a very efficient algorithm and its implementation, to compute the drainage network (i.e. the flow direction and flow accumulation) on huge terrains stored in external memory. Its utility lies in processing the large volume of high resolution terrestrial data newly available, which internal memory algorithms cannot handle efficiently. The flow direction is computed using an adaptation of our previous method RWFlood that uses a flooding process to quickly remove internal depressions or basins. Flooding, proceeding inward from the outside of the terrain, works oppositely to the common method of computing downhill flow from the peaks. To reduce the number of I/O operations, EMFlow adopts a new strategy to subdivide the terrain into islands that are processed separately. The terrain cells are grouped into blocks that are stored in a special data structure managed as a cache memory. EMFlow’s execution time was compared against the two most recent and most efficient published methods: TerraFlow and r.watershed.seg. It was, on average, 25 and 110 times faster than TerraFlow and r.watershed.seg respectively. Also, EMFlow could process larger datasets. Processing a 50000 × 50000 terrain on a machine with 2GB of internal memory took about 4500 seconds, compared to 87000 seconds for TerraFlow while r.watershed.seg failed on terrains larger than 15000 ×15000. On very small, say1000 ×1000 terrains, EMFlow takes under a second, compared to 6 and 20 seconds in r.watershed.seg and TerraFlow respectively. So EMFlow could be a component of a future interactive system where a user could modify terrain and immediately see the new hydrography. Numéro de notice : A2015--034 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1007/s10707-015-0225-y En ligne : https://doi.org/10.1007/s10707-015-0225-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81120
in Geoinformatica > vol 19 n° 4 (October - December 2015) . - pp 671 - 692[article]Land cover changes assessment using object-based image analysis in the Binah River watershed (Togo and Benin) / Hèou Maléki Badjana in Earth and space science, vol 2 n° 10 (October 2015)
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Titre : Land cover changes assessment using object-based image analysis in the Binah River watershed (Togo and Benin) Type de document : Article/Communication Auteurs : Hèou Maléki Badjana, Auteur ; Jörg Helmschrot, Auteur ; Peter Selsam, Auteur ; Kperkouma Wala, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 403 - 416 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse d'image orientée objet
[Termes IGN] analyse diachronique
[Termes IGN] bassin hydrographique
[Termes IGN] Bénin
[Termes IGN] changement d'occupation du sol
[Termes IGN] déboisement
[Termes IGN] détection de changement
[Termes IGN] image Landsat-MSS
[Termes IGN] image Landsat-OLI
[Termes IGN] image Landsat-TM
[Termes IGN] occupation du sol
[Termes IGN] savane
[Termes IGN] TogoRésumé : (auteur) In this study, land cover changes between 1972 and 2013 were investigated in the Binah River watershed (North of Togo and Benin) using remote sensing and geographic information system technologies. Multitemporal satellite images—Landsat MSS (1972), TM (1987), and OLI-TIRS (2013)—were processed using object-based image analysis and post–classification comparison methods including landscape metrics and changes trajectories analysis. Land cover maps referring to five main land cover classes, namely, agricultural land, forest land, savannah, settlements, and water bodies, were produced for each acquisition date. The overall accuracies were 76.64% (1972), 83.52% (1987), and 88.84% (2013) with respective Kappa statistics of 0.69, 0.78, and 0.86. The assessment of the spatiotemporal pattern of land cover changes indicates that savannah, the main vegetation type, has undergone the most dominant change, decreasing from 67% of the basin area in 1972 to 56% in 1987 and 33% in 2013. At the same time, agricultural land has significantly increased from 15% in 1972 to 24% in 1987 and 43% in 2013, while some proportions of agricultural land were converted to savannah relating to fallow agriculture. In total, more than 55% of the landscape experienced changes between 1972 and 2013. These changes are primarily due to human activities and population growth. In addition, agricultural activities significantly contributed to the increase in the number of patches, degree of division, and splitting index of forest and savannah vegetations and the decrease in their effective mesh sizes. These results indicate further fragmentation of forest and savannah vegetations between 1972 and 2013. Further research is needed to quantitatively evaluate the influences of individual factors of human activities and to separate these from the impacts of climate change-driven disturbances. Numéro de notice : A2015--042 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : doi.org/10.1002/2014EA000083 En ligne : http://dx.doi.org/10.1002/2014EA000083 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81804
in Earth and space science > vol 2 n° 10 (October 2015) . - pp 403 - 416[article]Multi-method monitoring of Glacier d’Argentière dynamics / Lionel Benoit in Annals of Glaciology, vol 56 n° 70 (October 2015)
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PermalinkQuantitative assessment of the sensitivity to desertification in the Bradano River basin (Basilicata, southern Italy) / Filomena Canora in Journal of maps, vol 11 n° 5 ([01/10/2015])
PermalinkLa gestion de l'eau dans la plaine de Pise au cours des siècles : Premières analyses SIG / Gourguen Davtian in Géomatique expert, n° 106 (septembre - octobre 2015)
PermalinkMapping the impacts of Iceland's Katla subglacial volcano on the Mýrdalsjökull glacier / Chelsi A. McNeill-Jewer in Cartographica, vol 50 n° 3 (Fall 2015)
PermalinkNumerical and experimental evaluation of terrestrial LiDAR for parameterizing centimeter-scale sea ice surface roughness / Jack C. Landy in IEEE Transactions on geoscience and remote sensing, vol 53 n° 9 (September 2015)
PermalinkReducing leakage error in GRACE-observed long-term ice mass change: a case study in West Antarctica / J. L. Chen in Journal of geodesy, vol 89 n° 9 (september 2015)
PermalinkGIS based drainage morphometry and its influence on hydrology in parts of Western Ghats region, Maharashtra, India / Dipak R. Samal in Geocarto international, vol 30 n° 7 - 8 (August - September 2015)
PermalinkThe status of measurement of the Mediterranean mean dynamic topography by geodetic techniques / Philip L. Woodworth in Journal of geodesy, vol 89 n° 8 (August 2015)
PermalinkBathymetry of lake Constance – a high-resolution survey in a large, deep lake / Martin Wessels in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement, Vol 140 n° 4 (Juli - August 2015)
PermalinkVulnérabilité et adaptation au changement climatique : L'apport des Géosciences / Gonéri Le Cozannet in Géosciences, Hors série sans n° (juillet 2015)
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