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Spatial analysis of heath toponymy in relation to present-day heathland distribution / Jaime Fagundez in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 51 - 60 Titre : Spatial analysis of heath toponymy in relation to present-day heathland distribution Type de document : Article/Communication Auteurs : Jaime Fagundez, Auteur ; Jesus Izco, Auteur Année de publication : 2016 Article en page(s) : pp 51 - 60 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse spatiale [Termes IGN] Galice (Espagne) [Termes IGN] habitat d'espèce [Termes IGN] lande [Termes IGN] paysage [Termes IGN] toponyme Résumé : (auteur) We explore the use of toponyms as an information source of land use changes in heathland landscapes of Galicia, an Atlantic region of northwest Spain. Heathlands are prized for their condition of remarkable landscapes, biodiversity reservoirs and cultural heritage areas. A strong decline of heathland cover has taken place in Atlantic Europe during the last centuries, as land use changes toward more productive systems. Galicia retains a high proportion of heathland cover, but there is a trend of land use transformation to forest plantations and improved pastures. Place names rooted with vernacular names of heathers (Erica, Calluna and Daboecia genera, Ericaceae) were recorded in a geo-referenced database. We applied spatial statistics to account for correlation between heath toponym density and present-day heathland distribution. We did not find such correlation, but differences were found for altitudinal ranks, suggesting a wider habitat loss at lowlands than at mountain areas. We discuss the possibilities of a systematic use of toponymic databases in historical landscape reconstruction. Numéro de notice : A2016-009 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1017729 En ligne : http://dx.doi.org/10.1080/13658816.2015.1017729 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79330 [article]

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Modelling forest canopy trends with on-demand spatial simulation / Gordon M. Green in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 61 - 73 Titre : Modelling forest canopy trends with on-demand spatial simulation Type de document : Article/Communication Auteurs : Gordon M. Green, Auteur ; Sean C. Ahearn, Auteur Année de publication : 2016 Article en page(s) : pp 61 - 73 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] champ aléatoire de Markov [Termes IGN] forêt [Termes IGN] image Terra-MODIS [Termes IGN] modèle numérique de surface de la canopée [Termes IGN] service web géographique [Termes IGN] simulation numérique Résumé : (auteur) Understanding trends in forest canopy cover at local, national, and global scales is important for many applications, including policymaking related to forest carbon sequestration. Globally consistent land-cover data sets derived from MODerate-resolution Imaging Spectroradiometer (MODIS) are now available for a period of more than 10 years, long enough to detect trends both in deforestation and in afforestation. However, methods of modelling land-cover change normally require specialized software and expertise, limiting the availability of this information. This barrier to access can be eliminated through the use of web services that construct models on demand based on user-specified regions of interest, so that parameters are inferred from, and relevant to, local conditions. In this paper we present a proof-of-concept system for building and running spatial Markov chain models of forest-cover change on demand, and demonstrate how the on-demand approach may be implemented for similar applications. Numéro de notice : A2016-010 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1066791 En ligne : http://dx.doi.org/10.1080/13658816.2015.1066791 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79331 [article]

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A wildlife movement approach to optimally locate wildlife crossing structures / Rebecca W. Loraamm in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 74 - 88 Titre : A wildlife movement approach to optimally locate wildlife crossing structures Type de document : Article/Communication Auteurs : Rebecca W. Loraamm, Auteur ; Joni A. Downs, Auteur Année de publication : 2016 Article en page(s) : pp 74 - 88 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] croisement spatial [Termes IGN] faune [Termes IGN] migration animale [Termes IGN] noeud [Termes IGN] optimisation (mathématiques) [Termes IGN] route [Termes IGN] Time-geography Résumé : (auteur) Transportation networks negatively impact wildlife populations by limiting the physical movement of the individual animal. In extreme cases road presence can lead to collisions between vehicles and animals, resulting in direct mortality if an animal attempts to cross the road. Crossing structures are one commonly used method for reducing wildlife–vehicle collisions. However, limited funding often reduces the amount of structures that may be constructed in practice. Therefore, areas that have the highest probability for animal interactions with roads should be targeted for locating new structures to provide the best possible outcome. This research uses a probabilistic time-geographic strategy coupled with a site selection phase handled by a classical optimization model to site wildlife crossing structures. To achieve optimal site selection, crossing locations are first identified where wildlife frequently cross roads, and then a maximum covering location problem is applied to these areas as demand nodes. The objective is to cover the largest area having the highest probability of interaction given a finite number of crossing structures available to be located. Coverage is defined in terms of fencing distance associated with a particular structure. The approach was demonstrated using Florida panther telemetry data identifying potential crossing structures across two counties in south Florida. The maximal covering location problem (MCLP) was solved for four coverage distances using radio telemetry tracking data, which captured frequent contact with roads. The results identify that the most effective coverage distance is 2000 m, which incrementally covers more total animal–road interaction probability than that of lower fencing distances in the case of the Florida panther. The results illustrate how this new time-geographic approach, combined with location modeling, measures animal–road interactions probabilistically for finding the optimum placement of wildlife crossing structures. Numéro de notice : A2016-011 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1083995 En ligne : http://dx.doi.org/10.1080/13658816.2015.1083995 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79332 [article]

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Range-expanding wildlife: modelling the distribution of large mammals in Japan, with management implications / Masayuki U. Saito in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 20 - 35 Titre : Range-expanding wildlife: modelling the distribution of large mammals in Japan, with management implications Type de document : Article/Communication Auteurs : Masayuki U. Saito, Auteur ; Hiroshi Momose, Auteur ; Satoshi Inoue, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 20 - 35 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] conflit d'usage [Termes IGN] écotone [Termes IGN] habitat animal [Termes IGN] Japon [Termes IGN] Mammalia [Termes IGN] modèle de simulation [Termes IGN] modélisation spatiale [Termes IGN] répartition géographique Résumé : (auteur) The spatial distribution of large mammals has been increasing in industrial nations, often leading to conflicts with humans and significant alteration of natural ecosystems. Species distribution models (SDMs) of the sika deer, Japanese serow, wild boar, Japanese macaque and Asiatic black bear in Japan were constructed to identify the important factors for habitat management. We also projected two scenarios of their future range expansions under a scenario of no change in the variables, and one where the variables change according to a time series. Modelling showed that all species preferred forest and forest/agricultural ecotones. In the best models of the sika deer and wild boar, grasslands (GRASSs) were an important positive factor, while human population density and hunting pressures were negative factors. High human population density was also a negative factor with the Japanese serow and Asiatic black bear. Key environments for the distribution and expansion of large mammals were agricultural areas near forest and GRASSs. Therefore, limiting the access of large mammals to such habitats may contribute to wildlife management. In both scenarios, our projections suggest that the distributions of all species could expand by 2028, resulting in more conflict with humans and significant alterations to natural ecosystems in the future. In order to stop this damaging expansion, habitat management and landscape redesign are important. However, a SDM and future projection include uncertainty. It is necessary to validate the estimates and projections by monitoring the future changes in distribution. Numéro de notice : A2016-085 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2014.952301 En ligne : https://doi.org/10.1080/13658816.2014.952301 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79870 [article]

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A function-based linear map symbol building and rendering method using shader language / Songshan Yue in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 143 - 167 Titre : A function-based linear map symbol building and rendering method using shader language Type de document : Article/Communication Auteurs : Songshan Yue, Auteur ; Jianshun Yang, Auteur ; Min Chen, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 143 - 167 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] communication cartographique [Termes IGN] détail topographique [Termes IGN] figuré linéaire [Termes IGN] rendu réaliste [Termes IGN] route [Termes IGN] signe conventionnel [Termes IGN] Styled Layer Descriptor [Termes IGN] symbole graphique [Termes IGN] visée oblique [Vedettes matières IGN] Cartologie Résumé : (auteur) Maps are widely used to visualize geo-information so that map users can develop related understandings about the real world. Such a process for communicating information is largely dependent on the rendering of map elements using different symbols (points and linear and area symbols). To meet the demand of more dynamic and comprehensive visualization in map rendering, it is essential to improve the rendering efficiency. This paper focuses on these research topics, especially the difficulty in constructing and drawing linear map symbols. By employing shader language, a function-based linear symbol building and rendering method is presented in this paper. The basic idea of this function-based method is to build a map-rendering solution that employs graphic processing unit (GPU) acceleration technology to improve the rendering efficiency. A ‘function’ is used to represent the algorithm that draws certain simple or complex linear map symbols. This function reflects the structure of a linear map symbol (describing the symbol construction information) and also the rendering process of the symbolized linear map elements (handled on a per-pixel basis by the shader program). Based on the Open Geospatial Consortium (OGC), Styled Layer Descriptor (SLD) specifications, four basic line types (i.e., solid lines, dashed lines, gradient color lines, and transition lines) are implemented in the proposed method, and the implementation of line markers, line joins and line caps is also discussed. Three experiments are conducted to demonstrate improvements in map rendering. The results show that a variety of linear map symbols can be constructed in a uniform way, which suggests that the proposed method addresses the difficulty in drawing linear map symbols. With this method, the efficiency of rendering linear map elements is substantially improved compared to using the graphics device interface plus (GDI+) and anti-grain geometry (AGG) methods; it also provides an applicable approach for developing map rendering systems. Using this function-based concept, the complexity of building linear map symbols and drawing linear map elements can be decreased. Numéro de notice : A2016-086 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1077964 En ligne : https://doi.org/10.1080/13658816.2015.1077964 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79871 [article]

Exemplaires(1)

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Visualisation and evaluation of flood uncertainties based on ensemble modelling / N. J. Lim in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 240 - 262 Titre : Visualisation and evaluation of flood uncertainties based on ensemble modelling Type de document : Article/Communication Auteurs : N. J. Lim, Auteur ; S. Anders Brandt, Auteur ; Stefan Seipel, Auteur Année de publication : 2016 Article en page(s) : pp 240 - 262 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] aide à la décision [Termes IGN] analyse multicritère [Termes IGN] incertitude des données [Termes IGN] inondation [Termes IGN] lecture de carte [Termes IGN] modèle numérique [Termes IGN] risque naturel [Termes IGN] visualisation 2D [Termes IGN] visualisation 3D Résumé : (auteur) This study evaluates how users incorporate visualisation of flood uncertainty information in decision-making. An experiment was conducted where participants were given the task to decide building locations, taking into account homeowners’ preferences as well as dilemmas imposed by flood risks at the site. Two general types of visualisations for presenting uncertainties from ensemble modelling were evaluated: (1) uncertainty maps, which used aggregated ensemble results; and (2) performance bars showing all individual simulation outputs from the ensemble. Both were supplemented with either two-dimensional (2D) or three-dimensional (3D) contextual information, to give an overview of the area. The results showed that the type of uncertainty visualisation was highly influential on users’ decisions, whereas the representation of the contextual information (2D or 3D) was not. Visualisation with performance bars was more intuitive and effective for the task performed than the uncertainty map. It clearly affected users’ decisions in avoiding certain-to-be-flooded areas. Patterns to which the distances were decided from the homeowners’ preferred positions and the uncertainties were similar, when the 2D and 3D map models were used side by side with the uncertainty map. On the other hand, contextual information affected the time to solve the task. With the 3D map, it took the participants longer time to decide the locations, compared with the other combinations using the 2D model. Designing the visualisation so as to provide more detailed information made respondents avoid dangerous decisions. This has also led to less variation in their overall responses. Numéro de notice : A2016-087 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1085539 En ligne : https://doi.org/10.1080/13658816.2015.1085539 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79872 [article]

Exemplaires(1)

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Empirical determination of geometric parameters for selective omission in a road network / Qi Zhou in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 263 - 299 Titre : Empirical determination of geometric parameters for selective omission in a road network Type de document : Article/Communication Auteurs : Qi Zhou, Auteur ; Zhilin Li, Auteur Année de publication : 2016 Article en page(s) : pp 263 - 299 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] généralisation cartographique automatisée [Termes IGN] généralisation géométrique (de visualisation) [Termes IGN] Hong-Kong [Termes IGN] modèle empirique [Termes IGN] Nouvelle-Zélande [Termes IGN] réseau routier [Termes IGN] visualisation cartographique [Vedettes matières IGN] Généralisation Résumé : (auteur) Selective omission in a road network is a necessary operation for road network generalization. Most existing selective omission approaches involve one or two geometric parameters at a specific scale to determine which roads should be retained or eliminated. This study proposes an approach for determining the empirical threshold for such a parameter. The idea of the proposed approach is to first subdivide a large road network, and then to use appropriate threshold(s) obtained from one or several subdivisions to infer an appropriate threshold for the large one. A series of experiments was carried out to validate the proposed approach. Specifically, the road network data for New Zealand and Hong Kong at different scales (ranging from 1:50,000 to 1:250,000) were used as the experimental data, and subdivided according to different modes (i.e. administrative boundary data, a regular grid of different sizes, different update years, and different road network patterns). Not only geometric parameters, but also structural and hybrid parameters of existing selective omission approaches were involved in the testing. The experimental results show that although the most appropriate thresholds obtained from different subdivisions are not always the same, in most cases, the appropriate threshold ranges often overlap, especially for geometric parameters, and they also overlap with those obtained from the large road network data. This finding is consistent with the use of different subdivision modes, which verifies the effectiveness of the proposed approach. Several issues involving the use of the proposed approach are also addressed. Numéro de notice : A2016-088 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1085538 En ligne : https://doi.org/10.1080/13658816.2015.1085538 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79873 [article]

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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)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 300 - 315 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 données Résumé : (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 [article]

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The Minkowski approach for choosing the distance metric in geographically weighted regression / B. Lu in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 351 - 368 Titre : The Minkowski approach for choosing the distance metric in geographically weighted regression Type de document : Article/Communication Auteurs : B. Lu, Auteur ; M. Charlton, Auteur ; C. Brunsdon, Auteur ; P. Harris, Auteur Année de publication : 2016 Article en page(s) : pp 351 - 368 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] analyse spatiale [Termes IGN] distance [Termes IGN] espace-temps [Termes IGN] régression géographiquement pondérée Résumé : (auteur) In this study, the geographically weighted regression (GWR) model is adapted to benefit from a broad range of distance metrics, where it is demonstrated that a well-chosen distance metric can improve model performance. How to choose or define such a distance metric is key, and in this respect, a ‘Minkowski approach’ is proposed that enables the selection of an optimum distance metric for a given GWR model. This approach is evaluated within a simulation experiment consisting of three scenarios. The results are twofold: (1) a well-chosen distance metric can significantly improve the predictive accuracy of a GWR model; and (2) the approach allows a good approximation of the underlying ‘optimal distance metric’, which is considered useful when the ‘true’ distance metric is unknown. Numéro de notice : A2016-090 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1087001 En ligne : https://doi.org/10.1080/13658816.2015.1087001 Format de la ressource électronique : URL sommaire Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79875 [article]

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Geo-temporal Twitter demographics / Paul A. Longley in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 369 - 389 Titre : Geo-temporal Twitter demographics Type de document : Article/Communication Auteurs : Paul A. Longley, Auteur ; Muhammad Adnan, Auteur Année de publication : 2016 Article en page(s) : pp 369 - 389 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] données démographiques [Termes IGN] données issues des réseaux sociaux [Termes IGN] données spatiotemporelles [Termes IGN] entropie de Shannon [Termes IGN] géographie humaine [Termes IGN] Londres [Termes IGN] milieu urbain [Termes IGN] Twitter Résumé : (auteur) This paper seeks and uses highly disaggregate social media sources to characterize Greater London in terms of flows of people with modelled individual characteristics, as well as conventional measures of land use morphology and night-time residence. We conduct three analyses. First, we use the Shannon Entropy measure to characterize the geography of information creation across the city. Second, we create a geo-temporal demographic classification of Twitter users in London. Third, we begin to use Twitter data to characterize the links between different locations across the city. We see all three elements as data rich, highly disaggregate geo-temporal analysis of urban form and function, albeit one that pertains to no clearly defined population. Our conclusions reflect upon this severe shortcoming in analysis using social media data, and its implications for progressing our understanding of socio-spatial distributions within cities. Numéro de notice : A2016-091 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1089441 En ligne : https://doi.org/10.1080/13658816.2015.1089441 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79876 [article]

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Spatially constrained clustering of ecological units to facilitate the design of integrated water monitoring networks in the St. Lawrence Basin / M.D. Adams in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 390 - 404 Titre : Spatially constrained clustering of ecological units to facilitate the design of integrated water monitoring networks in the St. Lawrence Basin Type de document : Article/Communication Auteurs : M.D. Adams, Auteur ; P.S. Kanaroglou, Auteur ; P. Coulibaly, Auteur Année de publication : 2016 Article en page(s) : pp 390 - 404 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse en composantes principales [Termes IGN] bassin hydrographique [Termes IGN] Canada [Termes IGN] eau douce [Termes IGN] Saint-Laurent (fleuve) [Termes IGN] surveillance écologique Résumé : (auteur) Water monitoring networks are generally classified into surface water, precipitation, groundwater or water quality monitoring networks. The design of these networks typically occurs in isolation from each other. We present a regionalization approach to identify homogeneous subregions of large basins that are suitable as areas for the optimization of an integrated water monitoring network. The study area, which comprises a portion of the St. Lawrence Basin, was spatially divided using ecological units. For each ecological unit, 21 attributes were derived including both environmental and hydrological indicators. A spatially constrained regionalization technique was applied to define the final regions. A scree plot was used to determine the number of regions. The sensitivity of the technique to the correlation in the attribute data was removed by utilizing principal component analysis to reduce correlation between attribute data. During regionalization, the component values were weighted by their proportion of the total variance explained. The four regions in the final configuration had areas from 19% to 31% of the total area, 63,597 km2. For the St. Lawrence Basin, this approach is effective for defining homogeneous regions that can be used in further research on the optimization of integrated water monitoring networks. The approach is portable to other regions and can incorporate any set of attribute data that is valuable to the regionalization objective. Numéro de notice : A2016-092 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1089442 En ligne : https://doi.org/https://doi.org/10.1080/13658816.2015.1089442 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79877 [article]

Exemplaires(1)

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079-2016011	RAB	Revue	Centre de documentation	En réserve L003	Disponible