نتایج جستجو برای: digital terrain model

تعداد نتایج: 2369560  

2013
Pratibha P. Shingare Sumit S. Kale

Digital Elevation Models commonly known as DEM’s are widely used in Terrain Analysis & image processing applications. A Digital Elevation Model is commonly used for Analysis of various features & objects which are remotely sensed by various devices & Techniques of Modern Era. Detail Literature Review of DEM by referring various Journals & Research papers is proposed in this paper. Various Remot...

Journal: :Cartographica 2009
Alastair William Pearson Martin Schaefer Bernhard Jenny

This article assesses the accuracy of the terrain models of Joachim Eugen Müller (1752–1833) in relation to modern digital elevation data using non-contact 3D digitizing techniques. The results are objective testimony to the skill and endeavour of Joachim Eugen Müller. Using techniques primitive by modern standards, Müller provided Johann Henry Weiss (1758–1826) with data of hitherto unparallel...

2014
Yunhua Gu Xiaoyan Wu Jin Wang

To solve the problem of three-dimensional terrain simplification in large-scale which was based on digital elevation model (DEM) data, a terrain simplified method based on the theory of spatial autocorrelation was proposed. The slope, a key factor for expressing the terrain features, has been taken into account in this method. According to principle of regional similarities in geomorphology is ...

2003
Yihui Lu Kurt Kubik Mohammed Bennamoun John Trinder

Digital Elevation Models (DEM) produced by digital photogrammetry workstations supply important information on land form for cartographers and Geographic Information Systems (GIS) developers and users. Since the accuracy of maps, orthophotographs and GIS databases must be within a specified range for appropriate analysis of the information and subsequent decision making, an accurate DEM is need...

Journal: :Journal of the Faculty of Agriculture, Kyushu University 1991

Journal: :The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2017

2009
Adrian Schubert Michael Jehle David Small Erich Meier

Switzerland's diversity of flat, rolling and Alpine terrain makes it ideal territory for geometric validation studies. We describe here two parallel investigations of TerraSAR-X (TSX) high-resolution data: geometric validation and estimation of the tropospheric path delay using measurements of corner reflectors (CRs) placed at different altitudes but nearly identical ranges. Geometric validatio...

Journal: :International Journal of Geographical Information Science 2003
Javier G. Corripio

Terrain parameters derived from digital elevation models (DEMs), such as slope gradient, aspect and cell surface area, are represented as a vector normal to the surface and calculated using the minimum areal unit of the DEM, that is enclosed between four data points. The position of the Sun is calculated by applying rotational matrices to a unit vector defined at noon as a function of latitude ...

Journal: :International Journal of Geographical Information Science 2015
Brooke E. Marston Bernhard Jenny

Relief shading is the most common type of cartographic relief representation for print and digital maps. Manual relief shading results in informative and visually pleasing representations of terrain, but it is time consuming and expensive to produce. Current analytical relief shading can be created quickly, but the resulting maps are not as aesthetically appealing and do not show landscape feat...

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