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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (108 résultats)

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  • Archive ; Carte ancienne ; Cartographie ; Espagne ; Glacier ; Histoire de la cartographie ; Milieu naturel ; Montagne ; Paysage ; Petit âge glaciaire ; Représentation cartographique ; Représentation de l'espace ; Représentation graphique ; Savoir
  • La documentation graphique (graphiques, dessins, croquis et cartes) incluse dans les ouvrages et relations de voyage dès le XVIIe siècle, a contribué à l'interprétation géographique du paysage de la Sierra Nevada, relief le plus élevé de la Chaîne
  • 2008
  • Investigation of elevation bias of the SRTM C- and X-band digital elevation models
  • Altitude ; Australia ; Digital elevation model ; Land utilisation ; Plant canopy ; Queensland ; Radar imagery ; Remote sensing ; Sar imagery ; Statistical bias ; Vegetation
  • This paper presents results of a comparative study of the vegetation-caused elevation bias of the space shuttle topographic mission data product, both C- and X-band (SRTM.C/X). The SRTM.C/X bands data were compared against a high-resolution digital
  • relating the elevation bias to the percentage of the vegetation cover of a given land parcel. This model, once verified on varieties of vegetation types, could be utilised to estimate and eliminate the elevation bias from the InSAR elevation model.
  • 2008
  • Main features of geomorphology of the Sudetes re-assessed in the light of digital elevation model
  • Czech Republic ; Digital elevation model ; Geomorphology ; Mountain ; Sudety ; Tectonics
  • The Sudetes as a geomorphological region are distinguished by complicated spatial pattern of high- and low-altitude terrains and variable mean slope gradients across the range. An analysis of a digital elevation model and maps derived from the model
  • 2008
  • Spectral filtering as a method of visualising and removing striped artefacts in digital elevation data
  • Comparative study ; Digital elevation model ; England ; Error ; Geographical information system ; Geomorphometry ; Norway ; Research technique ; United Kingdom
  • Spectral filtering was compared with traditional mean spatial filters to assess their ability to identify and remove striped artefacts in digital elevation data. The techniques were applied to 2 datasets : a 100 m contour derived digital elevation
  • . Artefacts were found to be heterogeneous through the surfaces, a result of their strong correlations with spatially autocorrelated variables : landcover and landsurface geometry. Spectrally filtered digital elevation datasets were found to provide a superior
  • 2008
  • Residual relief separation : digital elevation model enhancement for geomorphological mapping
  • Cartography ; Digital elevation model ; Drumlin ; Geomorphology ; Ireland ; Lineament ; Photointerpretation ; Research technique ; Residual landform ; Satellite imagery
  • 2008
  • Digital elevation model ; Drainage network ; Geomorphometry ; Guerrero ; Methodology ; Mexico ; Watershed
  • In general the drainage network length measurement is done in a 2-dimensional space taking into account the features extracted from topographic maps. By using Digital Elevation Models (DEM), one can obtain more accurate results by replacing
  • 2008
  • Biogeography ; China ; Digital elevation model ; Qinghai ; Remote sensing ; Satellite imagery ; Spatial distribution ; Vegetation ; Vegetation index
  • on the land cover classification map and 5 grade elevation belts derived from Qinghai DEM.
  • 2008
  • Australia ; Digital elevation model ; Drainage network ; Earth surface processes ; Erosion rate ; Model ; Northern Territory ; Sediment transport ; Soil erosion ; Watershed
  • This study examines whether a digital elevation model can be hydrologically correct (i.e. all depressions removed so that all water can run downslope) before use in a landscape evolution model and what effect depression removal has on long-term
  • 2008
  • Clay mineral ; Digital elevation model ; Granite ; Guerrero ; Mass movement ; Mexico ; Mountain ; Slope gradient ; Subtropical zone ; Weathering
  • and the rate of slope lowering is suggested. The research is based on field survey and digital elevation model interpretation, aided by mineralogical analysis.
  • 2008
  • Badland ; Clay ; Digital elevation model ; Erosion rate ; Italy ; Mass movement ; Photogrammetry ; Soil erosion ; Toscana ; Water erosion ; Watershed
  • and winter as a consequence of intense rainstorms. Results and discussion on the erosion rate, comparison between 1976 and 1994 digital elevation models obtained from photogrammetric restitution.
  • 2008
  • Alluvial cone ; California ; Digital elevation model ; Fluvial processes ; Geographical information system ; Geomorphometry ; Remote sensing ; United States of America
  • This study explores the surface variability of alluvial fans from digital elevations model (DEM) derivatives generated from 1-m planimetric resolution airborne laser swath mapping data. Channel and interfluve dimensions of debris flow (DF) fans
  • 2008
  • et par des températures hivernales exceptionnellement élevées sur l'Atlantique-Nord, ainsi que des îles britanniques au nord de la Chine. - (JPB)
  • 2008
  • Czech Republic ; Data base ; Digital elevation model ; Modelling ; Soil erosion ; Topography
  • 2008
  • Caractérisation des blocs métallifères dans une région minière par les hauteurs maxima absolue et relative et le degré élevé de dissection.
  • 2008
  • Applied geography ; Climate ; Digital elevation model ; Environment ; Environmental conservation ; Geographical information system ; Geomatics ; Infrastructure ; Radiation ; Slovenia ; Solar energy
  • 2008
  • Automated mapping ; Digital elevation model ; Methodology ; Remote sensing
  • 2008
  • nouveaux marchés. Pays avec l'indice le plus élevé de dette public par rapport au PIB, 2006.
  • 2008
  • Analyse des tendances climatiques aux latitudes élevées de l'hémisphère Nord
  • 2008
  • Propriétés physico-chimiques, toxicologiques et tératologiques des sédiments de fond des lacs de Carélie. Les résultats des tests biologiques confirment la toxicité élevée des sols fortement acidifiés des lacs (pH de l'eau de 5,5 et moins).
  • 2008