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Comparison of angles from surface slope-aspect algorithms / M.E. Hodgson in Cartography and geographic information systems, vol 25 n° 3 (July 1998)  

Public [article]  inCartography and geographic information systems > vol 25 n° 3 (July 1998) . - pp 173 - 185 Titre : Comparison of angles from surface slope-aspect algorithms Type de document : Article/Communication Auteurs : M.E. Hodgson, Auteur Année de publication : 1998 Article en page(s) : pp 173 - 185 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] angle [Termes IGN] classification barycentrique [Termes IGN] modèle numérique de surface [Termes IGN] pente Résumé : (Auteur) Few studies have compared algorithms for mapping surface slope and aspect from digital elevation models. Those studies that have compared these algorithms treat slope and aspect angles independently. The evaluation and comparison of surface orientation algorithms may also be conducted by treating slope and aspect as characteristics of a bidirectional vector normal to the surface. Such a comparison is more appropriate for selecting an accurate surface orientation algorithm for applications that use bidirectional measurements, such as modeling solar radiation or removing the topographic effect from remotely sensed imagery. This study empirically compared the slope angle and bidirectional surface angle estimated from five slope/ aspect algorithms using a synthetic terrain surface and an actual terrain surface. The most accurate algorithm is consistently that which uses only the four nearest neighboring elevations in the grid. Numéro de notice : A1998-207 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1559/152304098782383106 En ligne : https://doi.org/10.1559/152304098782383106 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26171 [article]

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Looking forward: geographic information services and libraries in the future / Barbara P. Buttenfield in Cartography and geographic information systems, vol 25 n° 3 (July 1998)  

Public [article]  inCartography and geographic information systems > vol 25 n° 3 (July 1998) . - pp 161 - 171 Titre : Looking forward: geographic information services and libraries in the future Type de document : Article/Communication Auteurs : Barbara P. Buttenfield, Auteur Année de publication : 1998 Article en page(s) : pp 161 - 171 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] catalogue de données localisées [Termes IGN] données localisées numériques [Termes IGN] information géographique Résumé : (Auteur) This paper outlines aspects of present information technology, commerce, and science in the context of geographic information. A review of recent collaborations of government, private sector, and academic representatives identifies possible trajectories for the future of geographic information services. Drawing from these efforts, implications and opportunities for digital libraries are summarized. Opportunities include data clearinghouse activities ; brokering information to government organizations, community coordinators, and lay citizens ; provision of customized searches ; provision of data manipulation or small format map output ; assistance with interpreting downloaded information ; and serving as an alternate lifelong learning center for access to and use of geographic information. Numéro de notice : A1998-208 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304098782383124 En ligne : https://doi.org/10.1559/152304098782383124 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26172 [article]

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Building a north spatial data infrastructure / David Coleman in Cartography and geographic information systems, vol 25 n° 3 (July 1998)  

Public [article]  inCartography and geographic information systems > vol 25 n° 3 (July 1998) . - pp 151 - 160 Titre : Building a north spatial data infrastructure Type de document : Article/Communication Auteurs : David Coleman, Auteur ; D. Nebert, Auteur Année de publication : 1998 Article en page(s) : pp 151 - 160 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] Amérique du nord [Termes IGN] infrastructure nationale des données localisées Résumé : (Auteur) This paper addresses the state of spatial data infrastructures within North America in late 1997. After providing some barkgylaund underlying the philosophy and development of the SDI concept, the authors discuss effects of technology, institutions, and standardization that confront the cohesive implementation of a common infrastructure today. The paper concludes with a comparative framework and specific examples of elements and initiatives defining respective spatial data infrastruture initiatives in the United States and Canada. Numéro de notice : A1998-209 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304098782383098 En ligne : https://doi.org/10.1559/152304098782383098 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26173 [article]

Exemplaires(1)

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Towards a California geospatial digital library: a strategy for networked knowledge / X.R. Lopez in Cartography and geographic information systems, vol 25 n° 3 (July 1998)  

Public [article]  inCartography and geographic information systems > vol 25 n° 3 (July 1998) . - pp 133 - 141 Titre : Towards a California geospatial digital library: a strategy for networked knowledge Type de document : Article/Communication Auteurs : X.R. Lopez, Auteur ; M. Larsgaard, Auteur Année de publication : 1998 Article en page(s) : pp 133 - 141 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] Californie (Etats-Unis) [Termes IGN] catalogue de données localisées [Termes IGN] données localisées numériques [Termes IGN] système d'information géographique Résumé : (Auteur) In this paper, digital libraries, a new form of networked organization, are examined. Suitable organizational frameworks are necessary to develop and sustain digital library initiatives and to use them most effectively. This paper assumes that today's information network, in the broadest sense, will form the environment for tomorrow's organization. The technological and institutional factors driving and supporting the development of digital libraries are explored. The benefits of digital libraries are listed as are institutional impediments to their implementation and technical and organizational challenges to their operation. The core management needs of a digi-tal library are discussed. Experience is drawn from the proposed California Digital Library and the emerging Alexandria Digital Library. Numéro de notice : A1998-216 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304098782383115 En ligne : https://doi.org/10.1559/152304098782383115 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26180 [article]

Exemplaires(1)

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Spatial data and the digital library / M. Lamont in Cartography and geographic information systems, vol 25 n° 3 (July 1998)  

Public [article]  inCartography and geographic information systems > vol 25 n° 3 (July 1998) . - pp 143 - 149 Titre : Spatial data and the digital library Type de document : Article/Communication Auteurs : M. Lamont, Auteur ; C. Marley, Auteur Année de publication : 1998 Article en page(s) : pp 143 - 149 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique [Termes IGN] catalogue de données localisées [Termes IGN] données localisées numériques [Termes IGN] système d'information géographique Résumé : (Auteur) As geographic information technologies develop and gain new and often nontraditional users, librarians are working to develop services and collections to meet their needs. Acquiring, managing, describing, and distributing information are traditional library functions that must be adapted for spatial data. The heavy toll on libraries, in terms of budgetary and staff resources, however, make service and collection decisions difficult. With assistance, spatial data services in libraries can grow to complement and aid the GIS user community. This article discusses collecting spatial data, partnering with GIS professionals, and implementing GIS services within the library. Numéro de notice : A1998-217 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/152304098782383070 En ligne : https://doi.org/10.1559/152304098782383070 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26181 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-98031	RAB	Revue	Centre de documentation	En réserve L003	Disponible