Descripteur
Documents disponibles dans cette catégorie (396)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Using remote sensing data to develop seasonal outlooks for Arctic regional sea-ice minimum extent / S. Drobot in Remote sensing of environment, vol 111 n° 2-3 (30 November 2007)
[article]
Titre : Using remote sensing data to develop seasonal outlooks for Arctic regional sea-ice minimum extent Type de document : Article/Communication Auteurs : S. Drobot, Auteur Année de publication : 2007 Article en page(s) : pp 136 - 147 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Arctique
[Termes IGN] Canada
[Termes IGN] épaisseur de la glace
[Termes IGN] glace de mer
[Termes IGN] prévision à court terme
[Termes IGN] régression linéaire
[Termes IGN] variation saisonnièreRésumé : (Auteur) This paper discusses the development of simple multiple linear regression (MLR) models for developing seasonal forecasts of the annual minimum sea-ice extent in the Beaufort/Chukchi Seas, the Laptev/East Siberian Seas, the Kara/Barents Seas, and the Canadian Arctic Archipelago regions. The potential predictor data are based on mean monthly weighted indices of sea-ice concentration, multiyear sea-ice concentration, surface skin temperature, surface albedo, and downwelling longwave radiation flux at the surface. Predictions are developed based on data available in March (spring forecast), to coincide with the National American Ice Service's annual outlooks, and based on data available in June (summer forecast), which would provide a seasonal revision. The final regression equations retain one to three predictors, and each of the MLR models is superior to climatology. The r2 for the MLR models range from a low of 0.44 (for the spring forecast in the Canadian Arctic Archipelago) to a high of 0.80 (for the summer forecast in the Beaufort/Chukchi Seas). Copyright Elsevier Numéro de notice : A2007-486 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2007.03.024 En ligne : https://doi.org/10.1016/j.rse.2007.03.024 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28849
in Remote sensing of environment > vol 111 n° 2-3 (30 November 2007) . - pp 136 - 147[article]Short-term response of Arctic vegetation NDVI to temperature anomalies / I. Olthof in International Journal of Remote Sensing IJRS, vol 28 n° 21-22 (November 2007)
[article]
Titre : Short-term response of Arctic vegetation NDVI to temperature anomalies Type de document : Article/Communication Auteurs : I. Olthof, Auteur ; R. Latifovic, Auteur Année de publication : 2007 Article en page(s) : pp 4823 - 4840 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] anomalie thermique
[Termes IGN] Arctique
[Termes IGN] Canada
[Termes IGN] changement climatique
[Termes IGN] détection de changement
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] surveillance de la végétationRésumé : (Auteur) The effects of climate change on northern vegetation productivity need to be fully understood in order to reduce uncertainties in predicting vegetation distributions under different climate warming scenarios. Knowledge of the relationship between northern climate and vegetation productivity will also help provide a better understanding of changes in vegetation distributions as an indicator of climate change and variability. Vegetation productivity and biomass have been monitored using long-term satellite earth observations, mostly using the Normalized Difference Vegetation Index (NDVI), as a cumulative indicator of all effects resulting from processes related to climate change, including changes in temperature, precipitation, and disturbance. In this paper, the investigation is focused on the short-term effect of temperature anomalies on arctic and tree-line transition vegetation productivity in both dry and humid regions of Canada. The analysis shows that several land-cover types composed mainly of trees and shrubs exhibit a significant increase in NDVI with higher-than-normal temperatures in the preceding 10-40-day period, while land-cover types consisting of lichen and moss growing on mostly barren surfaces show a significant NDVI decrease with increased temperature. These trends are consistent with results reported in plot-warming experiments in the north, which have shown that certain vegetation communities increase, while others decrease in cover fraction and biomass in response to warming. When land cover is grouped into increasing and decreasing NDVI with temperature and stratified by dry and humid regions of Canada, much of the dry region of northern Canada does not exhibit significant NDVI response to preceding temperature anomalies. It is expected that in the absence of disturbance or other limiting factors, an increased frequency of elevated temperature anomalies may eventually contribute to changes in vegetation biomass. A map of land-cover types that have the potential to increase in biomass with climate warming and those that are vulnerable to decline is presented. Copyright Taylor & Francis Numéro de notice : A2007-491 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701268996 En ligne : https://doi.org/10.1080/01431160701268996 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28854
in International Journal of Remote Sensing IJRS > vol 28 n° 21-22 (November 2007) . - pp 4823 - 4840[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-07121 RAB Revue Centre de documentation En réserve L003 Disponible Optimization in multi-scale segmentation of high-resolution satellite images for artificial feature recognition / Jing Tian in International Journal of Remote Sensing IJRS, vol 28 n°19-20 (October 2007)
[article]
Titre : Optimization in multi-scale segmentation of high-resolution satellite images for artificial feature recognition Type de document : Article/Communication Auteurs : Jing Tian, Auteur ; D.M. Chen, Auteur Année de publication : 2007 Article en page(s) : pp 4625 - 4644 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] bati
[Termes IGN] détail topographique artificiel
[Termes IGN] eCognition
[Termes IGN] image à résolution métrique
[Termes IGN] image Ikonos
[Termes IGN] image multibande
[Termes IGN] Ontario (Canada)
[Termes IGN] optimisation (mathématiques)
[Termes IGN] segmentation multi-échelleRésumé : (Auteur) Multi-resolution segmentation, as one of the most popular approaches in object-oriented image segmentation, has been greatly enabled by the advent of the commercial software, eCognition. However, the application of multi-resolution segmentation still poses problems, especially in its operational aspects. This paper addresses the issue of optimization of the algorithm-associated parameters in multi-resolution segmentation. A framework starting with the definition of meaningful objects is proposed to find optimal segmentations for a given feature type. The proposed framework was tested to segment three exemplary artificial feature types (sports fields, roads, and residential buildings) in IKONOS multi-spectral images, based on a sampling scheme of all the parameters required by the algorithm. Results show that the feature-type-oriented segmentation evaluation provides an insight to the decision-making process in choosing appropriate parameters towards a high-quality segmentation. By adopting these feature-type-based optimal parameters, multi-resolution segmentation is able to produce objects of desired form to represent artificial features. Copyright Taylor & Francis Numéro de notice : A2007-450 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701241746 En ligne : https://doi.org/10.1080/01431160701241746 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28813
in International Journal of Remote Sensing IJRS > vol 28 n°19-20 (October 2007) . - pp 4625 - 4644[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-07111 RAB Revue Centre de documentation En réserve L003 Disponible Regenerating boreal forest structure estimation using SPOT-5 pan-sharpened imagery / A.L. Wunderle in International Journal of Remote Sensing IJRS, vol 28 n°19-20 (October 2007)
[article]
Titre : Regenerating boreal forest structure estimation using SPOT-5 pan-sharpened imagery Type de document : Article/Communication Auteurs : A.L. Wunderle, Auteur ; Steven E. Franklin, Auteur ; X.G. Guo, Auteur Année de publication : 2007 Article en page(s) : pp 4351 - 4364 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Alberta (Canada)
[Termes IGN] analyse en composantes principales
[Termes IGN] complexité
[Termes IGN] forêt boréale
[Termes IGN] habitat animal
[Termes IGN] image SPOT 5
[Termes IGN] Mammalia
[Termes IGN] pansharpening (fusion d'images)
[Termes IGN] régression
[Termes IGN] texture d'imageRésumé : (Auteur) Forested stand structure is an important target variable within the fields of wildlife ecology. Remote sensing has often been suggested as a viable alternative to time consuming field and aerial investigations to determine forest structural attributes. In this study, 44 stands of recently harvested, regenerating, and old growth forest within the Foothills Model Forest in west-central Alberta were selected to test the ability of pan-sharpened SPOT-5 spectral response to classify stand structure. For each stand, a Structural Complexity Index (SCI) was calculated from field data using principal components analysis. To complement the spectral response data set and further increase accuracy, the normalized difference moisture index (NDMI) and three window sizes (55, 1111, and 2525) of first- (mean and standard deviation) and second-order (homogeneity, entropy, contrast, and correlation) textural measures were calculated over the pan-sharpened image. Stepwise multivariate regression analysis was used to determine the best explanatory model of the SCI using the spectral and textural data. The NDMI, first-order standard deviation and second-order correlation texture measures were better able to explain differences in SCI among the 44 forest stands (r2 = 0.79). The most appropriate window size for the texture measures was 55 indicating that this is a measure only detectable at a very high spatial resolution. The resulting classified SCI values were comparable to the actual field level SCI (r2 = 0.74, p = 0.01) and were limited by the strong variability within stands. Future research may find this measure useful either as a separate parameter or as an indicator of forest age for use in wildlife habitat modelling. Copyright Taylor & Francis Numéro de notice : A2007-447 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701244849 En ligne : https://doi.org/10.1080/01431160701244849 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28810
in International Journal of Remote Sensing IJRS > vol 28 n°19-20 (October 2007) . - pp 4351 - 4364[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-07111 RAB Revue Centre de documentation En réserve L003 Disponible Canada-wide maps of dominant tree species from remotely sensed and ground data / G. Pavlic in Geocarto international, vol 22 n° 3 (September - November 2007)
[article]
Titre : Canada-wide maps of dominant tree species from remotely sensed and ground data Type de document : Article/Communication Auteurs : G. Pavlic, Auteur ; W. Chen, Auteur ; R. Fernandes, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 185 - 204 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] Canada
[Termes IGN] carte de la végétation
[Termes IGN] données de terrain
[Termes IGN] feuillu
[Termes IGN] image SPOT-Végétation
[Termes IGN] inventaire forestier étranger (données)
[Termes IGN] PinophytaRésumé : (Auteur) Information on the spatial distribution of dominant tree species is important as input or validation data in large scale ecological studies, such as carbon budget estimation, biodiversity assessment, and vegetation dynamic modelling. We used a 1-km resolution land cover map of Canada produced from 1998 SPOT VGT satellite data as the base map. Fractions of coniferous needleleaf or deciduous broadleaf forests within each 1-km pixel were then estimated by developing relationships with climate using land-cover maps from Landsat images selected as a representative sample. The fraction of coniferous/deciduous forest within each 1-km pixel was further divided into dominant species fractions using species composition information at the sub-ecoregion level, derived from statistics in the Canadian Forest Inventory (CanFI 1991/94 version), from narrative descriptions of ecoregions, and from topographical data. A total of 17 Canada-wide maps of dominant tree species groups at 1 km-resolution were produced. The estimates of this study agree well with CanFI data at the ecoregion level where available, and show good correspondence with published range maps of Canadian tree species. Numéro de notice : A2007-461 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040701201798 Date de publication en ligne : 16/08/2007 En ligne : https://doi.org/10.1080/10106040701201798 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28824
in Geocarto international > vol 22 n° 3 (September - November 2007) . - pp 185 - 204[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 059-07031 RAB Revue Centre de documentation En réserve L003 Disponible A geographic visualization approach to multi-criteria evaluation of urban quality of life / Claus Rinner in International journal of geographical information science IJGIS, vol 21 n° 8 (september 2007)PermalinkBuilding boundary tracing and regularization from airborne lidar point clouds / A. Sampath in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 7 (July 2007)PermalinkFrom cartography and mobility to location-based services: a Canadian business perspective / Martin Plante in Geomatica, vol 61 n° 2 (June 2007)PermalinkModelling and mapping potential hooded warbler (Wilsonia citrina) habitat using remotely sensed imagery / J. Pasher in Remote sensing of environment, vol 107 n° 3 (12 April 2007)PermalinkNetwork real-time kinematic performance analysis using RTCM 3.0 and the Southern Alberta network / Kyle O'Keefe in Geomatica, vol 61 n° 1 (March 2007)PermalinkUtilisation et apport des technologies géomatiques de pointe dans le secteur de la pêche aux îles de la Madeleine / Isabelle Lapierre in Geomatica, vol 60 n° 4 (December 2006)PermalinkAssessment of Quickbird high spatial resolution imagery to detect red attack damage due to mountain pine beetle infestation / Nicholas C. Coops in Remote sensing of environment, vol 103 n° 1 (15 July 2006)PermalinkWeb-based information service Canada: all information and data available in standardized formats / R. Baynes in Geoinformatics, vol 9 n° 5 (01/07/2006)PermalinkCrustal motion and deformation monitoring of the Canadian landmass / Joseph A. Henton in Geomatica, vol 60 n° 2 (June 2006)PermalinkA gravimetric geoid model as a vertical datum in Canada / Marc Véronneau in Geomatica, vol 60 n° 2 (June 2006)PermalinkSpace geodetic techniques and the canadian spatial reference system evolution, status and possibilities / Pierre Héroux in Geomatica, vol 60 n° 2 (June 2006)PermalinkPermalinkBase cation cycling in a pristine watershed of the Canadian boreal forest / Louis Duchesne in Biogeochemistry, vol 78 n° 2 (April 2006)PermalinkValue in virtuality / M.J. Wagner in GEO: Geoconnexion international, vol 5 n° 4 (april 2006)PermalinkA comparison of SDI funding arrangements in Europe and Canada / Garfield Giff in Geomatica, vol 60 n° 1 (March 2006)PermalinkAide à la décision pour l'aménagement du territoire / D. Graillot (2006)PermalinkZones de végétation et domaines bioclimatiques du Québec / Ministère des Forêts, de la Faune et des Parcs (Québec, Québec - Canada) (2006)PermalinkLidar validation using GIS : a case study comparison between two Lidar collection methods / T.L. Webster in Geocarto international, vol 20 n° 4 (December 2005 - February 2006)PermalinkIntegrating high resolution remote sensing, GIS and fuzzy set theory for identifying susceptibility areas of forest insect infestations / C. Bone in International Journal of Remote Sensing IJRS, vol 26 n° 21 (November 2005)PermalinkDynamique urbaine et télédétection : le choix de l'indicateur végétal, les cas de Montréal, Paris et Pékin / I. Biraud-Burot in Photo interprétation, vol 41 n° 4 (Novembre 2005)Permalink