The potential of digital filtering of generic topographic data for geomorphological research
Bassin-versant ; England ; Glissement de terrain ; Géomorphologie ; Image radar ; Modèle numérique de terrain ; Pente de versant ; Photogrammétrie ; Prévision ; Royaume-Uni ; Technique de recherche ; Topographie ; Traitement des données
The AA. evaluate the ability of digital filters to improve topographic representation using : 1) a Gaussian noise removal filter; 2) the proprietary filters commonly applied to these datasets; and 3) a terrain sensitive filter, similar to those
applied to laser altimetry data. Topographic representation is assessed in terms of both absolute accuracy measured with reference to independent check data and derived geomorphological variables (slope, upslope contributing area, topographic index
Cartographie ; Donnée ; Généralités sur la géographie ; Géodésie ; Informatique ; Topographie ; Traitement des données
Characterization of drafts, developed, and partially realized. EDP-projects referring to information (data) of terrain, topographic objects, cadastral and special thematic items. Reference systems for the co-ordination of the above data
Three-dimensional topographic on the foreshore zone of sandy beaches
Topographic surveys are carried out to elucidate the characteristics of topographic changes in the foreshore zone of two study sites on the Kashima Coast, Ibaraki Prefecture (Kanto). Three types of topographic change were put in order and a three
Carte topographique ; Cartographie ; Géomatique ; Lecture de la carte ; Manuel ; Représentation cartographique ; Symbole cartographique ; Système d'information géographique ; Traitement des données ; Télédétection
Cartographic symbol ; Cartographical display ; Cartography ; Data processing ; Geographical information system ; Geomatics ; Handbook ; Remote sensing ; Topographic map
Landsat TM as well as SPOT HRV provides good possibilities for mapping of bedrock outcrop areas to be presented on the Swedish topographical map on the scale of 1 : 50 000. The errors of the computer-based classification can be reduced by a clean-up
ASTER ; Algorithme ; Cartographie ; Chine ; Modèle numérique de terrain ; Topographie ; Traitement des données
with a regional network of 50 km x 50 km cell size, they explored the relationships among the 2 IACs and topographic features. Between the IACs there was a linear relationship that varied with DEM resolution. For a specific type of geomorphology, a threshold
resolution of DEM can be determined, below which the surface-area increment (i.e., IAC) is negligible. The results provided the first comprehensive estimate of the contributions of the topographic features, DEM resolution, and algorithms for the surface-area
increment, and indicated the scale-related properties and potential environmental consequences of topographic heterogeneity in various estimates of natural resources and ecosystem functions when area needs to be taken into account.
Topographic thresholds for plant colonization on semi-arid eroded slopes
In this paper, the AA. study the mechanisms that control plant colonization on semi-arid eroded slopes in the basin of the Alfambra River (Teruel, east Spain) by (i) determining topographic thresholds for plant colonization, (ii) identifying
the soil properties limiting plant establishment and (iii) assessing whether colonizing species have specific plant traits to cope with these limitations. Since soil erosion and water availability can limit plant establishment and both can interact
Topographical effects on the equilibrium-line altitude on glaciers
The most useful parameter to quantify the climatic effects on a glacier is the equilibrium-line altitude (ELA) : a line on the glacier where accumulation equals ablation. In this paper, the topographical and morphological effects on the ELA
Official topographic cartography in Germany looks back on a history of more than two hundred years. Through various stages of development its analogue map products reached their highest level in the nineteen-eighties. Since 1990, i.e
. the reunification of Germany and the introduction of the topographical ATKIS-information system, topographic cartography and its new digital products developed as an integral part of the new system. At present, German official topographic cartography
Ispol'zovanie faktornogo analiza dlja obrabotki azimutal'nyh izmerenij pri ocenke vzaimosvjazej prirodnyh uslovij karstoobrazovanija (Utilisation de l'analyse factorielle pour le traitement des mesures azimutales dans l'estimation des interrelations
Azimuths of surface runoff direction, surface slope towards reservoir and river as well as slope of the Artian topographic surface were measured and treated by means of the factor analysis with the aim to study interrelations between the natural
Thermo-topographically induced winds in the boundary layer over the Etosha Pan
Boundary layer winds over the Etosha Pan in Namibia reveal a diurnal oscillation. An analysis of this phenomenon is presented with relation to synoptic forcing and thermo-topographical forcing. - (AJC)
A field study on topographical and topsoil effects on runoff generation
In order to assess the influence of topographical factors on runoff yield on the rapidly crusting loamy soils of Central Belgium, a further study of runoff yield was undertaken, using a design allowing the separation of slope and topsoil effects
The Davisian scheme elucidates the sequential changes of topographic features. The positions of the stages imaged by Davis, however, are not adquate to explain the topographic characteristics of stages developed in the theory of landform development
by concurrent tectonics and denudation (H. Ohmori, 1978| T. Yoshikawa, 1985). A quantitative evaluation is made of the characteristics of topographic features described by Davis from the viewpoint of landform development by concurrent tectonics and denudation.
Forgotten battles, forgotten maps : resources for reconstructing historical topographical intelligence using army map service materials
Army ; Historical geography ; Source of documentation ; Topographic map ; United States of America
A. discusses the history of the United States Army Map Service (AMS) and how its materials, which deal with topographical intelligence (terrain, facilities, and transport networks in enemy territory), became available in library collections. He
Atlas ; Cartography ; Eighteenth Century ; Finland ; History of cartography ; Nineteenth Century ; Russians ; Topographic map
Cette cartographie a débuté après les traités de 1721 et de 1743. Importance de l'école topographique militaire instituée au cours de la période suédoise, qui a poursuivi ses activités sous la domination russe et, après son établissement à Hamina
Digital as well as photographic satellite image data offer a high potential of topographic and thematic information. The paper discusses the application of such data for mapping purposes. Main emphasis is laid on a new map type, the Satellite Image