Terrain characteristics, such as slope gradient, slope aspect, profile curvature, contour curvature computed from digital elevation model (DEM), are among the key inputs to digital soil surveys based on geographic information systems (GIS). These terrain attributes are computed over a neighborhood (spatial extent). The objective of this research was to investigate the combi ed effect of DEM res...

This paper proposes the localization algorithm that estimates a ground position by comparing the recovered elevations estimated from aerial images with digital elevation model (DEM). The proposed algorithm consists of two stages: recovering the sampled elevations from multiple aerial images and matching them with DEM. While conventional algorithms estimate the elevation field, that is, recovere...

Synthetic aperture radar interferometry (InSAR) is an important remote sensing technique to retrieve the terrain digital elevation model (DEM)[1][2]. Image coregistration, InSAR interferometric phase estimation (or noise filtering) and interferometric phase unwrapping[3][4][5][6] are three key processing procedures of InSAR. It is well known that the performance of interferometric phase estimat...

The aim of this tutorial is to show how to easily create a Digital Elevation Model (DEM) and orthorectified image from free ASTER satellite imagery. PCI Geomatica OrthoEngine is the software package used to perform the processing. The imagery used in this tutorial is from Southern Scotland, around Loch Doon in the United Kingdom. These web sites provide contextual pictures of the area….

Synthetic aperture radar SAR images are notoriously dii-cult to interpret. Segmentation is simpliied if a digital map is available, to which the image can be registered. Also, registration is simpliied if a digital elevation model DEM is available. In this paper it is shown that, if a DEM is unavailable, it can be estimated by minimising an energy functional consisting of a measure of agreement...

Abstrac t . A two-stage approach is discussed for reconstructing a dense digital elevation model (DEM) of the terrain from multiple pre-calibrated images taken by distinct cameras at different time under various illumination. First, the terrain DEM and orthoimage are obtained by independent voxel-based reconstruction of the terrain points using simple relations between the corresponding image g...

This case study concerns vertical errors of five different high-resolution digital elevation models (DEMs) originated from light detection and ranging (LiDAR), interferometric SAR (InSAR) and photogrammetric acquisition. The LiDAR DEM derived from last return points was considered as the reference DEM. The aim was to analyse the statistical and spatial distribution of the residuals and their re...

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...

Digital Elevation Models (DEM) produced by digital photogrammetry workstations are often used as a component in complex Geographic Information Systems (GIS) modeling. Since the accuracy of GIS databases must be within a specified range for appropriate analysis of the information and subsequent decision making, an accurate DEM is needed. Conventional image matching techniques may be classified a...