Results 1 - 10 of 154

Research Article Derivation of topographic variables from a digital elevation model given by a spheroidal trapezoidal grid

by Igor V. Florinsky
"... Abstract. Digital elevation models (DEMs) given by spheroidal trapezoidal grids are more appropriate for large regional, sub-continental, continental and global geological and soil studies than square-spaced DEMs. Here we develop a method for derivation of topographic variables, speci ® cally horizo ..."
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Abstract. Digital elevation models (DEMs) given by spheroidal trapezoidal grids are more appropriate for large regional, sub-continental, continental and global geological and soil studies than square-spaced DEMs. Here we develop a method for derivation of topographic variables, speci ® cally

Accuracy of local topographic variables derived from digital elevation models

by Igor V. Florinsky , 1998
"... We study the accuracy of data on some local topographic attributes derived from digital elevation models (DEMs). First, we carry out a test for the precision of four methods for calculation of partial derivatives of elevations. We find that the Evans method is the most precision algorithm of this k ..."
Abstract - Cited by 37 (3 self) - Add to MetaCart
We study the accuracy of data on some local topographic attributes derived from digital elevation models (DEMs). First, we carry out a test for the precision of four methods for calculation of partial derivatives of elevations. We find that the Evans method is the most precision algorithm

Research Article Accuracy of local topographic variables derived from digital elevation models

by Igor V. Florinsky
"... Abstract. We study the accuracy of data on some local topographic attributes derived from digital elevation models (DEMs). First, we carry out a test for the precision of four methods for calculation of partial derivatives of elevations. We ® nd that the Evans method is the most precision algorithm ..."
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Abstract. We study the accuracy of data on some local topographic attributes derived from digital elevation models (DEMs). First, we carry out a test for the precision of four methods for calculation of partial derivatives of elevations. We ® nd that the Evans method is the most precision algorithm

Modeling topographic potential for erosion and deposition using GIS

by H. Mitasova, J. Hofierka, M. Zlocha, Maros Zlocha, R. Iverson , 1996
"... . Modeling of erosion and deposition in complex terrain within a geographic information system (GIS) requires a high resolution digital elevation model (DEM), reliable estimation of topographic parameters, and formulation of erosion models adequate for digital representation of spatially distributed ..."
Abstract - Cited by 51 (3 self) - Add to MetaCart
distributed parameters. Regularized spline with tension was integrated within a GIS for computation of DEMs and topographic parameters from digitized contours or other point elevation data. For construction of flow lines and computation of upslope contributing areas an algorithm based on vector-grid approach

Terrain Analysis Using Digital Elevation Models in Hydrology

by David Tarboton , 2003
"... This paper describes methods that use digital elevation models (DEMs) in hydrology, implemented as an ArcGIS toolbar using Visual Basic and the ESRI object library. I describe generalized channel network delineation to objectively estimate drainage density and by using terrain curvature accommodate ..."
Abstract - Cited by 30 (1 self) - Add to MetaCart
spatially variable drainage density. The multiple flow direction field determined from a DEM also serves as a basis for routing overland and topographically driven subsurface flow useful in water quality, erosion and terrain stability modeling. New DEM derived quantities, such as downslope influence

Research Article The choice of window size in approximating topographic surfaces from Digital Elevation Models

by M. Albani, B. Klinkenberg, D. W. Andison, J. P. Kimmins
"... Abstract. Quantitative surface analysis through quadratic modelling of Digital Elevation Models (DEMs) is a promising tool for automatically describing the physical environment in ecological studies of terrestrial landscapes. Fundamental topographic variables such as slope, aspect, plan and profile ..."
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Abstract. Quantitative surface analysis through quadratic modelling of Digital Elevation Models (DEMs) is a promising tool for automatically describing the physical environment in ecological studies of terrestrial landscapes. Fundamental topographic variables such as slope, aspect, plan and profile

A New Approach for a Topographic Feature-Based Characterization of Digital Elevation Data

by Eric Saux, Rémy Thibaud, Ki-joune Li, Min-hwan Kim
"... Triangular Irregular Network (TIN) and Regular Square Grid (RSG) are widely used for representing 2.5 dimensional spatial data. However, these models are not defined from the topographic properties of the terrain (i.e., ridge lines, valley lines, saddle points, etc.). This paper introduces a three-s ..."
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Triangular Irregular Network (TIN) and Regular Square Grid (RSG) are widely used for representing 2.5 dimensional spatial data. However, these models are not defined from the topographic properties of the terrain (i.e., ridge lines, valley lines, saddle points, etc.). This paper introduces a three

GPS- vs. DEM-Derived Elevation Estimates from a

by Hardwood Dominated, Forest Watershed, L. Chris Kiser, J. Michael Kelly , 2010
"... Topographic attributes are often used as explanatory variables when providing spatial estimates of various environmental attribute response variables. Elevation of sampling locations can be derived from global posi-tioning systems (GPS) or digital elevation models (DEM). Given the potential for diff ..."
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Topographic attributes are often used as explanatory variables when providing spatial estimates of various environmental attribute response variables. Elevation of sampling locations can be derived from global posi-tioning systems (GPS) or digital elevation models (DEM). Given the potential

Accuracy assessment of automatically derived digital elevation models from ASTER data in mountainous terrain

by S. Eckert, T. Kellenberger, K. Itten - International Journal of Remote Sensing , 2005
"... (ASTER) aboard the Terra satellite was designed to generate along-track stereo images. The data are available at low cost, providing a feasible opportunity for generating digital elevation models (DEMs) in areas where little or no elevation data are yet available. This study evaluates the accuracy o ..."
Abstract - Cited by 20 (0 self) - Add to MetaCart
(ASTER) aboard the Terra satellite was designed to generate along-track stereo images. The data are available at low cost, providing a feasible opportunity for generating digital elevation models (DEMs) in areas where little or no elevation data are yet available. This study evaluates the accuracy

COMPARISON OF TWO ALGORITHMS FOR REMOVING DEPRESSIONS AND DELINEATING FLOW NETWORKS FROM GRID DIGITAL ELEVATION MODELS

by Anurag Srivastava, Anurag Srivastava , 2000
"... Digital elevation models (DEMs) and their derivatives such as slope, flow direction and flow accumulation maps, are used frequently as inputs to hydrologic and nonpoint source modeling. The depressions which are frequently present in DEMs may represent the actual topography, but are often the result ..."
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Digital elevation models (DEMs) and their derivatives such as slope, flow direction and flow accumulation maps, are used frequently as inputs to hydrologic and nonpoint source modeling. The depressions which are frequently present in DEMs may represent the actual topography, but are often
Results 1 - 10 of 154