نتایج جستجو برای: digital elevation models
تعداد نتایج: 1248315 فیلتر نتایج به سال:
this paper aims to assess the quality and accuracy aster dems and the arcgis alogorthms used for hydrologic analyses. to this end, first the plan of drainage networks in the region was extracted from aerial photographs and high resolution satellite images and was set as the real ground. in the next step, using the hydrology tool in arcgis software, raster networks of the region for the whole ca...
Flooding is one of the most devastating natural disasters occurring annually in the Philippines. A call for a solution for this malady is very challenging as well as crucial to be addressed. Mapping flood hazard is an effective tool in determining the extent and depth of floods associated with hazard level in specified areas that need to be prioritized during flood occurrences. Precedent to the...
Mapping the spatial distribution of soil taxonomic classes is important for useful and effective use of soil and management decisions. Digital soil mapping (DSM) may have advantages over conventional soil mapping approaches as it may better capture observed spatial variability and reduce the need to aggregate soil types. A key component of any DSM activity is the method used to define the relat...
abstract limitations of traditional (conventional) soil surveys and improvement of information technology have lead soil surveyors to invent new methods which are generally called digital soil mapping (dsm). the aim of these methods is the prediction of soil classes or soil properties based on easily-available or measuring environmental variables. the objective of this investigation is to study...
LISFLOOD-FP belongs to a new generation of hydrodynamic models of flood simulation, which is implemented by a digital elevation map for the river and the waterways, route information and flow rates The LISFLOOD-FP features are two-dimensional hydraulic models: 1. based on raster 2. large scale 3. ease of formulation and high computational efficiency 4. simplicity of use 5. spatial adjustmen...
Digital elevation models (DEMs) provide fundamental depictions of the three-dimensional shape Earth’s surface and are useful to a wide range disciplines. Ideally, DEMs record interface between atmosphere lithosphere using discrete two-dimensional grid, with complexities introduced by intervening hydrosphere, cryosphere, biosphere, anthroposphere. The treatment DEM surfaces, affected these spher...
A number of published stereo matching algorithms have been implemented and tested on SPOT images of areas for which we have gridded digital elevation models (DEMs) available with spacings of 80m or less as well as ground control checkpoints. Results will be presented for a comparison of stereo matched output with the DEMs and an analysis of the errors arising and their causes. Results will be d...
Techniques and experience to creation of Digital Models in Bulgaria Plamen Maldjanski SUMMARY Most important examples of digital elevation models (DTM) and digital models (DM’s) of monuments of culture and architecture in Bulgaria are described. Examples about the informative technologies influence of the evolution of the photogrammetrical ones are showed. Finally it is shown that the evolution...
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