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Creating a hydrographic network from its cartographic representation: a case study using Ordnance Survey mastermap data / Nicolas Regnauld in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)
[article]
Titre : Creating a hydrographic network from its cartographic representation: a case study using Ordnance Survey mastermap data Type de document : Article/Communication Auteurs : Nicolas Regnauld , Auteur ; William A Mackaness, Auteur Année de publication : 2006 Article en page(s) : pp 611 - 631 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] axe médian
[Termes IGN] carte numérisée
[Termes IGN] cartographie automatique
[Termes IGN] cartographie numérique
[Termes IGN] eau de surface
[Termes IGN] grande échelle
[Termes IGN] Grande-Bretagne
[Termes IGN] incertitude géométrique
[Termes IGN] modèle numérique de surface
[Termes IGN] Ordnance Survey of Great Britain
[Termes IGN] réseau hydrographique
[Termes IGN] squelettisation
[Termes IGN] zone rurale
[Termes IGN] zone urbaineRésumé : (Auteur) A meaningful hydrological network is critical to spatial analysis and modelling. 'Meaningful' in that it is topologically correct, provides a basis for modelling flow and differentiates between different types of water features. In Great Britain, large-scale digital mapping of hydrological features was captured from paper maps and had a cartographic emphasis that had poor attribution, and no underlying model that supported geographical modelling. This emphasis gave rise to rivers and lakes that were variously 'broken' into sections by features such as dams, bridges, and culverts. This paper reports on research to create automatically a topologically connected hydrological network that underpins the detailed cartographic representation of such features. The network was created by joining these hydrographic features together according to rules of both continuity and proximity between river sections, and their flow direction (using an underlying digital elevation model). Confidence values were associated with each section link reflecting the certainty of that connection. The confidence values provided a basis for directing human intervention to uncertain connections as part of the final editing process. The project took as its input OS MasterMap 'water feature' data. A skeletonisation process was used to create the medial axis of the network. The paper reports in detail the methodology, the implementation and evaluation. The algorithm worked well in rural areas where interruptions are small and there is greater variation in height. In urban areas the challenges were greater where typically relatively long sections of river may be re-engineered and culverted, and where the fidelity of the digital elevation model was insufficient to discern the subtle changes in elevation. Copyright Taylor & Francis Numéro de notice : A2006-237 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1080/13658810600607402 En ligne : https://doi.org/10.1080/13658810600607402 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27964
in International journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 611 - 631[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-06061 RAB Revue Centre de documentation En réserve L003 Disponible 079-06062 RAB Revue Centre de documentation En réserve L003 Disponible European property information, EULIS: removing barriers to cross-border lending / J. Atkey in GIM international, vol 20 n° 7 (July 2006)
[article]
Titre : European property information, EULIS: removing barriers to cross-border lending Type de document : Article/Communication Auteurs : J. Atkey, Auteur Année de publication : 2006 Article en page(s) : pp 21 - 23 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cadastre étranger
[Termes IGN] Angleterre
[Termes IGN] Autriche
[Termes IGN] cadastre étranger
[Termes IGN] Ecosse
[Termes IGN] Finlande
[Termes IGN] Lituanie
[Termes IGN] Norvège
[Termes IGN] Pays de Galles
[Termes IGN] Pays-Bas
[Termes IGN] portail
[Termes IGN] propriété foncière
[Termes IGN] Suède
[Termes IGN] Union EuropéenneRésumé : (Editeur) The aim of the European Land Information Service (EULIS) is to provide easy worldwide access to European land and property information in order to underpin a single European property market. Developments are on track, and live running is expected to start during 2006. The author discusses the topics involved. Copyright GITC Numéro de notice : A2006-251 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27978
in GIM international > vol 20 n° 7 (July 2006) . - pp 21 - 23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-06071 RAB Revue Centre de documentation Revues en salle Disponible Artificial neural networks for mapping regional-scale upland vegetation from high spatial resolution imagery / H. Mills in International Journal of Remote Sensing IJRS, vol 27 n° 11 (June 2006)
[article]
Titre : Artificial neural networks for mapping regional-scale upland vegetation from high spatial resolution imagery Type de document : Article/Communication Auteurs : H. Mills, Auteur ; M.E. Cutler, Auteur ; David Fairbairn, Auteur Année de publication : 2006 Article en page(s) : pp 2177 - 2195 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] carte de la végétation
[Termes IGN] classification par réseau neuronal
[Termes IGN] données de terrain
[Termes IGN] image à résolution métrique
[Termes IGN] image Ikonos
[Termes IGN] montagne
[Termes IGN] Perceptron multicouche
[Termes IGN] Royaume-UniRésumé : (Auteur) Upland vegetation represents an important resource that requires frequent monitoring. However, the heterogeneous nature of upland vegetation and lack of ground data require classification techniques that have a high degree of generalization ability. This study investigates the use of artificial neural networks as a means of mapping upland vegetation from remotely sensed data. First, the optimum size of support to map upland vegetation was estimated as being less than 4 m, which suggested that soft classification techniques and high spatial resolution IKONOS imagery were required. The use of high spatial resolution imagery for regional-scale areas has introduced new challenges to the remote sensing community, such as using limited ground data and mapping land-cover dynamics and variation over large areas. This work then investigated the utility of artificial neural networks (ANN) for regional-scale upland vegetation from IKONOS imagery using limited ground data and to map unseen data from remote geographical locations. A Multiple Layer Perceptron was trained with pixels from an IKONOS image using early stopping; however, despite high classification accuracies when calculated for pixels from an area where training pixels were extracted, the networks did not produce high accuracies when applied to unseen data from a remote area. Copyright Taylor & Francis. Numéro de notice : A2006-299 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160500396501 En ligne : https://doi.org/10.1080/01431160500396501 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28026
in International Journal of Remote Sensing IJRS > vol 27 n° 11 (June 2006) . - pp 2177 - 2195[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-06061 RAB Revue Centre de documentation En réserve L003 Exclu du prêt Updating topographic mapping in Great Britain using imagery from high-resolution satellite sensors / David A. Holland in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)
[article]
Titre : Updating topographic mapping in Great Britain using imagery from high-resolution satellite sensors Type de document : Article/Communication Auteurs : David A. Holland, Auteur ; Doreen S. Boyd, Auteur ; P. Marshall, Auteur Année de publication : 2006 Article en page(s) : pp 212 - 223 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] caméra numérique
[Termes IGN] détection de changement
[Termes IGN] Grande-Bretagne
[Termes IGN] image à haute résolution
[Termes IGN] mise à jour cartographique
[Termes IGN] organisme cartographique nationalRésumé : (Auteur) Topographic mapping from remotely sensed imagery is carried out all over the world, using data from an ever-growing number of sensors. Traditional film cameras are gradually being replaced by digital cameras and scanners, but most topographic mapping still relies on sensors based on airborne platforms. This paper examines the potential of high resolution satellite sensor imagery for the updating of topographic mapping, from the perspective of a national mapping agency. After a review of satellites capable of being used for this purpose, several examples of mapping projects are presented. The paper ends with a look to the future, and asks whether satellite imagery can ever replace airborne (digital or analogue) photography for the makers of maps. It is concluded that high resolution satellite sensor imagery does have a role to play in the update of topographic mapping, especially in the detection of change. Copyright ISPRS Numéro de notice : A2006-231 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.02.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.02.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27958
in ISPRS Journal of photogrammetry and remote sensing > vol 60 n° 3 (May 2006) . - pp 212 - 223[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-06031 SL Revue Centre de documentation Revues en salle Disponible Mapping the effects of water stress on sphagnum: preliminary observations using airborne remote sensing / A. Harris in Remote sensing of environment, vol 100 n° 3 (15 february 2006)
[article]
Titre : Mapping the effects of water stress on sphagnum: preliminary observations using airborne remote sensing Type de document : Article/Communication Auteurs : A. Harris, Auteur ; R.G. Bryant, Auteur ; A.J. Baird, Auteur Année de publication : 2006 Article en page(s) : pp 363 - 378 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse spectrale
[Termes IGN] canopée
[Termes IGN] eau de surface
[Termes IGN] humidité du sol
[Termes IGN] image aérienne
[Termes IGN] indice d'humidité
[Termes IGN] plante aquatique d'eau salée
[Termes IGN] réflectance spectrale
[Termes IGN] réflectance végétale
[Termes IGN] Royaume-Uni
[Termes IGN] Sphagnum (genre)
[Termes IGN] stress hydrique
[Termes IGN] tourbe
[Termes IGN] zone humideRésumé : (Auteur) Remote sensing of near-surface hydrological conditions within northern peatlands has the potential to provide important large-scale hydrological information regarding ecological and carbon-balance processes occuring within such systems. This article details how field knowledge of the spectral properties of Sphagnum spp., airborne remote sensing data and a range of image analysis approaches may be combined to provide a suitable proxy for near-surface wetness. Co-incident field and airborne remote sensing data were acquired in May and September 2002 over an important UK raised bog (Cors Fochno). A combination of laboratory-tested NIR and SWIR water-based and biophysical spectral reflectance indices were applied to field and airborne reflectance spectra of Sphagnum pulchrum to elucidate changes in near-surface moisture conditions. Field results showed significant correlations between water-based indices (moisture stress index (MSI) and floating water band indices (fWBI980 and fWB1200) and measures of both near-surface volumetric moisture content (VMC) and water-table position. Spectral indices formulated from the NIR (fWBI980 and fWBI1200) proved to be the most useful for indicating near-surface wetness across the widest range of moisture conditions because of their ability to penetrate deeper into the Sphagnum canopy. Correlations between a biophysical index based upon chlorophyll content and both hydrological measures were not significant, possibly due to relatively high levels of surface wetness at the field site in both May and September. S. pulchrum lawns were successfully located and mapped from airborne imagery using the mixed tuned match filtering (MTMF) algorithm. Importantly, MSI derived from airborne data was significantly correlated with both field moisture and the water-table position. Relationships between measures of near-surface wetness and the MSI for naturally heterogeneous canopies were, however, found to be weaker for airborne imagery than for associated field data. This is likely to be a result of the formulation of the MSI itself and the possible preferential detection of "wetter" pixels within the imagery. This effectively reduced the ability of MSI to detect subtle changes in near-surface wetness under high moisture conditions, but would not impede the use of the index under drier conditions. Results from the field data suggest that indices formulated from the NIR may be more suitable for detailed estimations of near-surface and surface wetness at the landscape-scale although reliable hyperspectral data are required to test fully the performance of such indices. The relative merits of using such an approach to determine near-surface hydrological conditions across entire peatland complexes are also discussed. Numéro de notice : A2006-036 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2005.10.024 En ligne : https://doi.org/10.1016/j.rse.2005.10.024 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27763
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