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Modeling visibility through vegetation / M. Llobera in International journal of geographical information science IJGIS, vol 21 n° 6-7 (july 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 6-7 (july 2007) . - pp 799 - 810 Titre : Modeling visibility through vegetation Type de document : Article/Communication Auteurs : M. Llobera, Auteur Année de publication : 2007 Article en page(s) : pp 799 - 810 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] archéométrie [Termes IGN] données localisées 3D [Termes IGN] ligne de visée [Termes IGN] végétation [Termes IGN] visibilité Résumé : (Auteur) The calculation of visibility patterns associated with past monuments and sites is an important element in modern landscape archaeology. These types of investigations have been limited by the inability of current viewshed routines to incorporate vegetation information. The following paper presents a new viewshed algorithm aimed at calculating the probability of locations being visible in the presence of vegetation. To this day, little work has been done to address this limitation, a notable exception is Dean's Permeability Index Model (1997). A review of Dean's model is provided here in the light of the new proposed algorithm. The new algorithm is based on mathematical principles found in Beer-Lambert's Attenuation Law, a physics law governing the attenuation of light through a medium. In addition to common viewshed parameters, the routine requires a 3D model of a tree/plant and a layer indicating the spatial distribution and density of vegetation on the landscape. The possibility of varying both, the spatial and density distribution of tree/plants, and the three-dimensional model representing vegetation makes the model well suited to investigate the impact that vegetation may have on visibility patterns. Copyright Taylor & Francis Numéro de notice : A2007-272 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/13658810601169865 En ligne : https://doi.org/10.1080/13658810601169865 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28635 [article]

Exemplaires(2)

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079-07041	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07042	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Extending GIS-based visual analysis: the concept of visualscapes / M. Llobera in International journal of geographical information science IJGIS, vol 17 n° 1 (february 2003)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 17 n° 1 (february 2003) . - pp 25 - 48 Titre : Extending GIS-based visual analysis: the concept of visualscapes Type de document : Article/Communication Auteurs : M. Llobera, Auteur Année de publication : 2003 Article en page(s) : pp 25 - 48 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] données vectorielles [Termes IGN] modèle logique de données [Termes IGN] paysage [Termes IGN] système d'information géographique [Termes IGN] vision [Termes IGN] visualisation 3D Résumé : (Auteur) A Geographical Information System (GIS) is used to retrieve and explore the spatial properties of the visual structure inherent in space. The first section of the article aims to gather, compare and contrast existing approaches used to study visual space and found in disciplines such as landscape architecture, urbanism, geography and landscape archaeology. The concept of a visualscape is introduced in the following section as a tentative unifying concept to describe all possible ways in which the structure of visual space may be defined, broken down and represented within GIS independently of the context in which it is applied. Previous visibility studies in GIS are reviewed and further explored under this new concept. The last section presents the derivation of new visual parameters and introduces a new data structure (i.e. a vector field) to describe the visual exposure of a terrain. Numéro de notice : A2003-103 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/713811741 En ligne : https://doi.org/10.1080/713811741 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22399 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-03011	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-03012	RAB	Revue	Centre de documentation	En réserve L003	Disponible