Large gradients, when calculated by a first-difference method, have been detected in the 9 arc-second National Digital Elevation Model (DEM) of Australia released by the Australian Surveying and Land Information Group. Gradient values implied by the mean elevations in the DEM between adjacent grid cells of up to 74° have been observed, most notably in Australia’s more mountainous regions in the...

Spectral filtering was compared with traditional mean spatial filters to assess their ability to identify and remove striped artefacts in digital elevation data. The techniques were applied to two datasets: a 100 m contour derived digital elevation model (DEM) of southern Norway and a 2 m LiDAR DSM of the Lake District, UK. Both datasets contained diagonal data artefacts that were found to prop...

Spectral filtering was compared with traditional mean spatial filters to assess their ability to identify and remove striped artefacts in digital elevation data. The techniques were applied to two datasets: a 100 m contour derived digital elevation model (DEM) of southern Norway and a 2 m LiDAR DSM of the Lake District, UK. Both datasets contained diagonal data artefacts that were found to prop...

Digital elevation models (DEM) are an essential component of many geographic information systems (GIS), especially in natural resources applications. Recently, a number of prototype geographic information systems based on quadtrees have been developed. Digital elevation data create special problems for quadtree systems, since neighboring grid cells seldom have identical values. In this paper, w...

there are technical and theoretical knowledge of the gully, ditch the clean areas on topographic maps and digital models that will help. however, the ability to use maps (dem) to identify the location and frequency of gully requires knowledge about the process of creating a moat.the present study modeled gulliation prone areas in dyreh river basin done. materials and methods used in this resear...

In this article we present a framework for modeling a building with a single Digital Elevation Model (DEM). The model is constructed in two stages. A first stage segments the DEM into planar surface patches to describe the building. Then, a polygonalisation stage generates the final polygonal model of the building by using constraints. We use robust estimation methods at different stages of our...

We present a system for modeling buildings from a single correlation-based Digital Elevation Model (DEM). The model is constructed in two stages. The first stage segments the DEM into planar surface patches that describe the building. The second stage generates the final polygonal model of the building using weak geometric constraints. We use robust estimation methods at different stages of our...

soil salinity has been a large problem in arid and semi arid regions. preparation of such maps is useful for natural resource managers. old methods of preparing such maps require a lot of time and cost. multi-spectral remotely sensed dates due to the broad vision and repeating of these imageries is suitable for provide saline soil maps. this investigation is conducted to provide saline soil map...

The high-resolution Cartosat-1 stereo image data is expected to have significant impact in topographic mapping and watershed applications. The objective of the present investigation is to make an assessment of the potential of the Cartosat-1 data in topographic mapping and generation of DEMs in operational mode using COTS packages. The assessment is based on the entropy analysis of the fore/aft...

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...