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The use of LiDAR in digital surface modelling: issues and errors / C. Leigh in Transactions in GIS, vol 13 n° 4 (August 2009)  

Public [article]  inTransactions in GIS > vol 13 n° 4 (August 2009) . - pp 345 - 361 Titre : The use of LiDAR in digital surface modelling: issues and errors Type de document : Article/Communication Auteurs : C. Leigh, Auteur ; D. Kidner, Auteur ; M.C. Thomas, Auteur Année de publication : 2009 Article en page(s) : pp 345 - 361 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] analyse de données [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] erreur géométrique [Termes IGN] littoral [Termes IGN] modèle numérique de surface [Termes IGN] modèle numérique de terrain [Termes IGN] Pays de Galles Résumé : (Auteur) Modelling and extracting 3D geographical data presents numerous challenges that require continual research to attempt to evolve an efficient, reliable and accurate solution. LiDAR data capture and analysis has become a preferred acquisition choice for elevation data because the resulting quality and level of detail far exceeds traditional methods for large survey areas. As with any data collection system, LiDAR is prone to errors. Analysing these errors, ascertaining causes and producing error correction strategies is vital if accurate and confident results are to be obtained. Eight years of LiDAR datasets (from 1998 to 2005) have been closely analysed for a large coastal area of South Wales. This article provides a detailed and accurate summary of the identified LiDAR data issues and subsequent errors which affect the accuracy of end products such as Digital Surface Models (DSMs). Copyright Blackwell Publishing Numéro de notice : A2009-527 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01168.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01168.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30156 [article]

Using NHDPlus as the land base for the Noah-distributed model / Christian David in Transactions in GIS, vol 13 n° 4 (August 2009)  

Public [article]  inTransactions in GIS > vol 13 n° 4 (August 2009) . - pp 363 - 377 Titre : Using NHDPlus as the land base for the Noah-distributed model Type de document : Article/Communication Auteurs : Christian David, Auteur ; D. Gochis, Auteur ; D.R. Maidment, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 363 - 377 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] courant marin [Termes IGN] données matricielles [Termes IGN] données vectorielles [Termes IGN] Etats-Unis [Termes IGN] hydrographie de surface [Termes IGN] modèle atmosphérique [Termes IGN] modèle hydrographique [Termes IGN] modèle numérique de terrain [Termes IGN] réseau hydrographique [Termes IGN] ressources en eau Résumé : (Auteur) The National Elevation, Hydrography and Land Cover datasets of the United States have been synthesized into a geospatial dataset called NHDPlus which is referenced to a spheroidal Earth, provides geospatial data layers for topography on 30 m rasters, and has vector coverages for catchments and river reaches. In this article, we examine the integration of NHDPlus with the Noah-distributed model. In order to retain compatibility with atmospheric models, Noah-distributed utilizes surface domain fields referenced to a spherical rather than spheroidal Earth in its computation of vertical land surface/atmosphere water and energy budgets (at coarse resolution) as well as horizontal cell-to-cell water routing across the land surface and through the shallow subsurface (at fine resolution). Two data-centric issues affecting the linkage between Noah-distributed and NHDPlus are examined: (1) the shape of the Earth; and (2) the linking of gridded landscape with a vector representation of the stream and river network. At mid-latitudes the errors due to projections between spherical and spheroidal representations of the Earth are significant. A catchment-based "pour point" technique is developed to link the raster and vector data to provide lateral inflow from the landscape to a one-dimensional river model. We conclude that, when Noah-distributed is run uncoupled to an atmospheric model, it is advantageous to implement Noah-distributed at the native spatial scale of the digital elevation data and the spheroidal Earth of the NHDPlus dataset rather than transforming the NHDPlus dataset to fit the coarser resolution and spherical Earth shape of the Noah-distributed model. Copyright Blackwell Publishing Numéro de notice : A2009-528 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01169.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01169.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30157 [article]

Geoweb services for sharing modelling results in biodiversity networks / K.D. Fook in Transactions in GIS, vol 13 n° 4 (August 2009)  

Public [article]  inTransactions in GIS > vol 13 n° 4 (August 2009) . - pp 379 - 399 Titre : Geoweb services for sharing modelling results in biodiversity networks Type de document : Article/Communication Auteurs : K.D. Fook, Auteur ; A. Viera Montero, Auteur ; G. Camara, Auteur ; M. Casanova, Auteur ; S. Amaral, Auteur Année de publication : 2009 Article en page(s) : pp 379 - 399 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] biodiversité [Termes IGN] coopération [Termes IGN] géomatique web [Termes IGN] modèle de simulation [Termes IGN] partage de données localisées [Termes IGN] prototype [Termes IGN] service web géographique Résumé : (Auteur) Biodiversity researchers in different institutions deal with predictive models for species distribution. These models are useful for biodiversity conservation policies. Species distribution modelling tools need large datasets from different sources and use many algorithms. To improve biodiversity science, scientists need to share models, data and results, and should be able to reproduce experiments from others. This article presents a geoweb service architecture that supports sharing of modelling results and enables researchers to perform new modelling experiments. We show the feasibility of the proposed architecture by developing a set of prototype services, called Web Biodiversity Collaborative Modelling Services – WBCMS. They provide a set of geospatial web services that support the sharing of species distribution models. The article includes an example of a model instance that explains the WBCMS prototype. We believe that WBCMS shows how to set up a cooperative research network on biodiversity research. Copyright Blackwell Publishing Numéro de notice : A2009-529 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01170.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01170.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30158 [article]

A GIS approach to estimation of building population for micro-spatial analysis / K. Lwin in Transactions in GIS, vol 13 n° 4 (August 2009)  

Public [article]  inTransactions in GIS > vol 13 n° 4 (August 2009) . - pp 401 - 414 Titre : A GIS approach to estimation of building population for micro-spatial analysis Type de document : Article/Communication Auteurs : K. Lwin, Auteur ; Yuji Murayama, Auteur Année de publication : 2009 Article en page(s) : pp 401 - 414 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] données démographiques [Termes IGN] habitat urbain [Termes IGN] logement [Termes IGN] mercatique [Termes IGN] population urbaine [Termes IGN] système d'information géographique Résumé : (Auteur) Population data used in GIS analyses is generally assumed to be homogeneous and planar (i.e. census tracts, townships or prefectures) due to the public unavailability of building population data. However, information on building population is required for micro-spatial analysis for improved disaster management and emergency preparedness, public facility management for urban planning, consumer and retail market analysis, environment and public health programs and other demographic studies. This article discusses a GIS approach using the Areametric and Volumetric methods for estimating building population based on census tracts and building footprint datasets. The estimated results were evaluated using actual building population data by visual, statistical and spatial means, and validated for use in micro-spatial analysis. We have also implemented a standalone GIS tool (known as 'PopShape GIS') for generating new building footprint with population attribute information based on user-defined criteria. Copyright Blackwell Publishing Numéro de notice : A2009-530 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2009.01171.x En ligne : https://doi.org/10.1111/j.1467-9671.2009.01171.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30159 [article]