Channel head location and characteristics using digital elevation models
Australia ; Digital elevation model ; Drainage network ; Hydrology ; Northern Territory ; Slope gradient ; Spatial distribution ; Watershed
Australie ; Bassin-versant ; Distribution spatiale ; Hydrologie ; Modèle numérique de terrain ; Northern Territory ; Pente de versant ; Réseau de drainage
This study examines channel head position and characteristics in a catchment in Arnhem Land, Northern Territory, Australia. The aims of this study are to measure the area-slope attributes of channel heads in this catchment and to investigate to what
extent channel head location can be predicted by the area-slope relationship and the cumulative area distribution. The effect of digital elevation model grid resolution on the ability to locate channel head position and assess hillslope length will also
A comparison of SRTM and high-resolution digital elevation models and their use in catchment geomorphology and hydrology : Australian examples
Australia ; Digital elevation model ; Geomorphology ; Hydrology ; Model ; New South Wales ; Northern Territory ; Remote sensing ; Runoff ; Soil erosion ; Soil moisture ; Watershed
Australie ; Bassin-versant ; Ecoulement ; Erosion des sols ; Géomorphologie ; Humidité du sol ; Hydrologie ; Modèle ; Modèle numérique de terrain ; New South Wales ; Northern Territory ; Télédétection
The AA. examine the Shuttle Radar Topography Mission (STRM) data for 3 catchments in Australia over a range of climates, geology and resultant geomorphology. The SRTM data are compared with high resolution digital elevation models. The AA. use basic
hydrology and geomorphology, as in all cases SRTM-derived catchment area is incorrect and smaller digital elevation grid sizes are required for accurate catchment-wide assessment.
Computer analysis of integrated digital data sets can be exploited for geomorphological classification using automated methods developed in the remote sensing community. In this study, geomorphological classification in a moderate- to high-relief
area dominated by slope processes in southwest Yukon Territory, is performed with a combined set of geomorphometric and spectral variables in a linear discriminant analysis. An automated method was developed to find the boundaries of geomorphological
Arid area ; Australia ; Flood ; Geochemistry ; Model ; Northern Territory ; Remote sensing ; Sediment transport ; Watershed
at catchment scale. Survey elevation data are combined with contour data to produce digital elevation models for terrain analysis, tracing of sediment flow paths and modelling of extreme floods. The resultant patterns are compared with observed radioelement
and discussion on average speed. Two digital models were done for the territory of Czechia for the years of 1991 and 2001 censi, i.e. before and after the transformation. The aim is to find out what changes occurred during the transformation and to use them
The article deals with accessibility of individual car transportation. It uses the GIS approach to focus on development of an accessibility model and on three main related issues: digital model of road network, factors influencing average speed
Czech Republic ; Data base ; Digital elevation model ; Model
An enormous thematic, geometric and format geodata variability as well as, its storaged in distant databases are typical for the situation in Czechia. The digital landscape model is an example of a new database tool reducing the traditional data
errors. The DLM structure and construction are based in the simplified form in Czech territory. - (MS)
Australia ; Digital elevation model ; Drainage network ; Earth surface processes ; Erosion rate ; Model ; Northern Territory ; Sediment transport ; Soil erosion ; Watershed
Australie ; Bassin-versant ; Erosion des sols ; Géomorphodynamique ; Modèle ; Modèle numérique de terrain ; Northern Territory ; Réseau de drainage ; Transport sédimentaire ; Vitesse d'érosion
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
geomorphology and hydrology. The impact on sediment transport rates is also examined. The study was conducted using a field catchment (Tin Camp Creek in Arnhem Land, Northern Territory, Australia) and a proposed landform for a post-mining landscape. The results
Testing of the Siberia landscape evolution model using the Tin Camp Creek, Northern Territory, Australia, field catchment
Australia ; Digital elevation model ; Drainage ; Geomorphology ; Hydrology ; Hypsometry ; Model ; Northern Territory ; Sediment transport ; Simulation ; Watershed
was then used to make independent predictions of the landform geomorphology of the study site. The catchment, located in the Northern Territory, is relatively untouched by Europeans so the hydrological and erosion processes that shaped the area can be assumed
Identificación de la segregación digitalterritorial en Bogotá, Colombia, a partir de la Encuesta de Calidad de Vida, 2007
Bogotá ; Colombia ; Communication ; Digital divide ; Household ; Information ; Internet ; Living conditions ; Neighbourhood ; Social class ; Social geography ; Social segregation
Concept ; Czech Republic ; Data base ; Digital elevation model ; Geographical information system ; Geomorphodiversity ; Geomorphological map ; Geomorphology
Geomorphodiversity is a critical and specific assessment of geomorphological features of a territory. The AA. characterize the geomorphodiversity of the Czech Republic that is situated in Central Europe in the complex contact zone of the old West
-European Platform and the young Carpathians Mountains. The results of the research project carried out by the AA. in the frame of publication of a digital Landscape Atlas of the Czech Republic in 2009 are the digital geomorphological information system
(geomorphological data-base) and GIS-based geomorphological map of the Czech Republic. The content of the paper is a computer supported quantitative evaluation of the geomorphodiversity of the territory using the geomorphological data-base of above mentioned GIS
Altitude ; Czech Republic ; Digital elevation model ; Land use ; Plant cover ; Slope gradient
9,000 basic territorial units (Btus) and 8 lucc categories that can be compared in all of the time periods mentioned. For the purpose of calculating the average altitude and slope inclination of all Btus, a digital terrain model (DtM) of czechia
This paper presents a preliminary subdivision of the entire Italian territory into formal topographic units and describes the rationale and the largely DEM-based techniques by which it was prepared. The classification is semi-quantitative, derived
from an unsupervised three-class cluster analysis of four derivatives of elevation and from the visual inspection of both geological maps and digitals maps of morphometric parameters.
Czech Republic ; Digital elevation model ; Geographical information system ; Landscape dynamics ; Remote sensing
Methodically the historical landscape studies are supported with territorial databases of maps and satellite imagery. Examples presented typical ways of GIS and RS applications in Czech Republic. - (EN)