In this paper, a three-dimensional error model of grid digital elevation model (DEM) is proposed based on the reconstructed contours. Though analyzing the construction of three-dimensional error model, the paper disassembles the three-dimensional error to a series of triangular pyramids and quadrangular pyramids, and it can make the calculation simpler. The three-dimensional error is continuous...

The generation of Digital Elevation Models (DEMs) is one photogrammetric process that has been successfully automated. However, a common criticism surrounding DEM generation software currently available commercially, is the lack of quality assessment procedures. This paper describes a new system called the Failure Warning Model (FWM), which automatically detects low accuracy areas and presents ...

This paper briefly reviews the application of digital elevation models (DEMs) to the study of landscapes. Such studies can involve both the enhancement of DEM images to highlight particular patterns, and the use of DEMs to model attribute values of landscapes. Recognition of palaesurfaces is an example of the first use, while modelling hydrological properties based on slope attributes derived f...

High resolution data have high relief displacement in hilly terrains. Development of Digital Elevation model helps to assess bio resources more accurately in such terrains. While estimating bio resources in the Himalayan hilly terrain using multispectral LISS-III data of 23 m spatial resolution, the need for orthorectifcation of satellite data was necessary to correct for spatial distances due ...

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...

The TanDEM-X mission will derive a global digital elevation model (DEM) with satellite SAR interferometry. The aimed accuracies are an absolute, resp. relative height error of 10m resp. 2m for 90% of the data. This paper gives an overview of the DEM adjustment within the TanDEM-X mission. The DEM adjustment estimates residual, systematic height offsets and deformations of each single interferom...

Since December 2004 the Institut Cartogràfic de Catalunya (ICC) has taken more than 135 000 digital aerial images with two Digital Mapping Cameras (DMC) from ZEISS/INTERGRAPH (Z/I). After three years of experience and with the new, fully digital, production lines well established, this paper analyses the performance of the digital camera in a true production environment, specially compared to t...

In this work, a new partition-collocation strategy for the parallel execution of CFD–DEM couplings is investigated. Having a good parallel performance is a key issue for an Eulerian-Lagrangian software that aims to be applied to solve industrially significant problems, as the computational cost of these couplings is one of their main drawback. The approach presented here consists in co-locating...

This paper describes the implementation of three methods for fitting surfaces: linear, quintic and stochastic. It uses qualitative (visual) and quantitative (statistical) criteria to compare the three approaches. The digital terrain model is based on a triangular irregular network (TIN) structure and the comparison is performed using a mathematically defined function and real data obtained from...