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Validation of medium-scale historical maps of southern Latvia for evaluation of impact of continuous forest cover on the present-day mean stand area and tree species richness / Anda Fescenko in Baltic forestry, vol 22 n° 1 ([01/02/2016])  

Public [article]  inBaltic forestry > vol 22 n° 1 [01/02/2016] . - pp 51 - 62 Titre : Validation of medium-scale historical maps of southern Latvia for evaluation of impact of continuous forest cover on the present-day mean stand area and tree species richness Type de document : Article/Communication Auteurs : Anda Fescenko, Auteur ; Martins Lukins, Auteur ; Ilja Fescenko, Auteur Année de publication : 2016 Article en page(s) : pp 51 - 62 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse multivariée [Termes IGN] carte ancienne [Termes IGN] continuité géographique [Termes IGN] couvert forestier [Termes IGN] données multitemporelles [Termes IGN] écosystème forestier [Termes IGN] feuillu [Termes IGN] inventaire forestier étranger (données) [Termes IGN] Lettonie [Termes IGN] régression [Termes IGN] richesse floristique [Termes IGN] station forestière [Termes IGN] utilisation du sol Résumé : (auteur) Medium-scale historical maps are often the only cartographic source of former forest area distribution on a regional level. In conjunction with a database of the current distribution of species or functional traits, maps may be valuable tool for studying the impact of previous land use on ecosystems. In this study a heterogeneous set of historical maps was used to reconstruct the multi-temporal pattern of the forest area in a moderately forested region (5,180 km2) of southern Latvia during the last 220 years. Changes in the total forest cover were assessed in four time slices and compared with available historical statistical data. To validate the obtained multi-temporal data for ecological studies, the impact of continuous forest cover on the present-day mean stand area and tree species richness derived from the present-day forest inventory database of 94,886 stands was quantified by bivariate and regression analyses. We found no significant impact of inaccuracy of the historical maps on the entire forest continuity pattern of the study area. In particular, the diversity metrics dependencies on the forest continuity can be described by quadratic regression models with coefficients of determination close to one. We also found that the mean stand area is for about 18% larger in woodlands with longer forest continuity irrespective of the forest type. The older woodland the less difference was found between boreal deciduous and nemoral deciduous forests in terms of tree species richness. Numéro de notice : A2016--096 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article DOI : sans En ligne : https://balticforestry.lammc.lt/bf/PDF_Articles/2016-22%5b1%5d/e-Baltic%20Forest [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84649 [article]

Decline of forest interior conditions in the conterminous United States / Kurt H. Riitters in Scientific reports, vol 2 (2012)    

Public [article]  inScientific reports > vol 2 (2012) Titre : Decline of forest interior conditions in the conterminous United States Type de document : Article/Communication Auteurs : Kurt H. Riitters, Auteur ; James D. Wickham, Auteur Année de publication : 2012 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] biodiversité [Termes IGN] continuité géographique [Termes IGN] développement durable [Termes IGN] Etats-Unis [Termes IGN] forêt Résumé : Forest fragmentation threatens the sustainability of forest interior environments, thereby endangering subordinate ecological attributes and functions. We analyzed the spatial patterns of forest loss and gain for the conterminous United States from 2001 to 2006 to determine whether forest interior environments were maintained at five spatial scales. A 1.1% net loss of total forest area translated to net losses of 3.2% to 10.5% of forest interior area over spatial scales of 4.41 ha to 5,310 ha. At the 65.6-ha scale, the reduction of forest interior area was 50,000 km2 – almost double the net loss of total forest area. The pervasive discrepancy between total forest loss and forest interior loss indicates a widespread shift of the extant forest to more fragmented conditions, even in regions exhibiting small net changes in extant forest area. In the conterminous United States, trends in total forest area underestimate threats to forest from forest fragmentation. Numéro de notice : A2012-694 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1038/srep00653 En ligne : https://doi.org/10.1038/srep00653 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74891 [article]

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Toward seamless indoor-outdoor applications : developing stakeholder-oriented location-based services / K. Ogawa in Geo-spatial Information Science, vol 14 n° 2 (01/06/2011)  

Public [article]  inGeo-spatial Information Science > vol 14 n° 2 (01/06/2011) . - pp 109 - 118 Titre : Toward seamless indoor-outdoor applications : developing stakeholder-oriented location-based services Type de document : Article/Communication Auteurs : K. Ogawa, Auteur ; Edward Verbree, Auteur ; Sisi Zlatanova, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 109 - 118 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] acteur [Termes IGN] architecture de système [Termes IGN] continuité géographique [Termes IGN] OpenLS [Termes IGN] positionnement en intérieur [Termes IGN] service fondé sur la position [Termes IGN] standard OGC Résumé : (Auteur) Location-Based Services (LBS), an emerging new business based on smartphone and mobile networks, are becoming more and more popular. Most of these LBSs, however, only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role. Our specific aim is to solve these issues. This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders. Numéro de notice : A2011-626 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s11806-011-0469-0 Date de publication en ligne : 14/08/2012 En ligne : https://doi.org/10.1007/s11806-011-0469-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33598 [article]

Algorithms for nearest neighbor search on moving object trajectories / E. Frentzos in Geoinformatica, vol 11 n° 2 (June - August 2007)  

Public [article]  inGeoinformatica > vol 11 n° 2 (June - August 2007) . - pp 159 - 193 Titre : Algorithms for nearest neighbor search on moving object trajectories Type de document : Article/Communication Auteurs : E. Frentzos, Auteur ; K. Gratsias, Auteur ; Nikos Pelekis, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 159 - 193 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] arbre-R [Termes IGN] base de données d'objets mobiles [Termes IGN] classification barycentrique [Termes IGN] continuité géographique [Termes IGN] distance euclidienne [Termes IGN] objet mobile [Termes IGN] objet statique [Termes IGN] spatial metrics Résumé : (Auteur) Nearest Neighbor (NN) search has been in the core of spatial and spatiotemporal database research during the last decade. The literature on NN query processing algorithms so far deals with either stationary or moving query points over static datasets or future (predicted) locations over a set of continuously moving points. With the increasing number of Mobile Location Services (MLS), the need for effective k-NN query processing over historical trajectory data has become the vehicle for data analysis, thus improving existing or even proposing new services. In this paper, we investigate mechanisms to perform NN search on R-tree-like structures storing historical information about moving object trajectories. The proposed (depth-first and best-first) algorithms vary with respect to the type of the query object (stationary or moving point) as well as the type of the query result (historical continuous or not), thus resulting in four types of NN queries. We also propose novel metrics to support our search ordering and pruning strategies. Using the implementation of the proposed algorithms on two members of the R-tree family for trajectory data (namely, the TB-tree and the 3D-R-tree), we demonstrate their scalability and efficiency through an extensive experimental study using large synthetic and real datasets. Copyright Springer Numéro de notice : A2007-236 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-0007-7 En ligne : https://doi.org/10.1007/s10707-006-0007-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28599 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
057-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Towards a general theory of geographic representation in GIS / Michael F. Goodchild in International journal of geographical information science IJGIS, vol 21 n° 3-4 (march - april 2007)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 21 n° 3-4 (march - april 2007) . - pp 239 - 260 Titre : Towards a general theory of geographic representation in GIS Type de document : Article/Communication Auteurs : Michael F. Goodchild, Auteur ; M. Yuan, Auteur ; T.J. Cova, Auteur Année de publication : 2007 Article en page(s) : pp 239 - 260 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] continuité géographique [Termes IGN] discrétisation [Termes IGN] modèle conceptuel de données localisées [Termes IGN] modèle orienté objet [Termes IGN] objet géographique [Termes IGN] quantité continue [Termes IGN] quantité discrète [Termes IGN] représentation continue Résumé : (Auteur) Geographic representation has become more complex through time as researchers have added new concepts, leading to apparently endless proliferation and creating a need for simplification. We show that many of these concepts can be derived from a single foundation that we term the atomic form of geographic information. The familiar concepts of continuous fields and discrete objects can be derived under suitable rules applied to the properties and values of the atomic form. Fields and objects are further integrated through the concept of phase space, and in the form of field objects. A second atomic concept is introduced, termed the geo-dipole, and shown to provide a foundation for object fields, metamaps, and the association classes of object-oriented data modelling. Geographic dynamics are synthesized in a three-dimensional space defined by static or dynamic object shape, the possibility of movement, and the possibility of dynamic internal structure. The atomic form also provides a tentative argument that discrete objects and continuous fields are the only possible bases for geographic representation. Copyright Taylor & Francis Numéro de notice : A2007-110 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600965271 En ligne : https://doi.org/10.1080/13658810600965271 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28473 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-07022	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Event-oriented approaches to geographic phenomena / Michael F. Worboys in International journal of geographical information science IJGIS, vol 19 n° 1 (january 2005)  

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