ABSTRACT: Digital terrain models (DTM) have become a commonly used source of data describing the shape of the Earth. Resolution determines the level of details that can be represented in this model. Changing the resolution influences the accuracy of the DTM. The effect of a resolution is even more clearly seen in slope and aspect calculation. Despite the resolution, there are different methods ...

In the past years laser scanner data has established itself as an accurate and reliable data basis for many applications. Highly accurate digital terrain models (DTM) can be derived by filtering laser data that contains information on the terrain and objects covering the surface. Also in wooded areas the DTM’s have a high accuracy, since many of the laser pulses penetrate the vegetation and pro...

This paper investigates the utility of different parameters from polarimetric interferometric SAR data for the identification of ground pixels in a woodland area to enable accurate digital terrain model (DTM) generation from the InSAR height of the selected ground hit pixels. The parameters assessed include radar backscatter, interferometric coherence, surface scattering proportion (based on Fr...

Digital Terrain Models (DTM) are topic of this paper. The SCOP approach uses hybrid DTMs which combines grid based and triangulated terrain models. A detailed discussion on interpolation and filter methods will be made as they can be employed, for example, to derive DTMs from laser scanning data. Additionally the database of SCOP and the integration into third-party software will be presented. ...

Rapidly developed automated data gathering techniques and methods like LIDAR (Light Detection And Ranging), GPS, integrated barymetric measurements consisted of GPS and digital sounder, are often used for obtaining observations for creation Digital Terrain Model (DTM). Methods mentioned above produce large data sets, which may cause problems for users at the stage of main processing, in which D...

Many automated processes in digital photogrammetry such as relative orientation of a stereopair of aerial images or a derivation of a digital terrain model (DTM) are based on image matching. Several approaches to image matching have been developed. In this paper, attention is paid to area based matching. Using of MATLAB in procedures of finding parameters of exterior orientation of an aerial im...

The paper introduces the extraction of objects that are higher than their surroundings, like houses, trees, or bridges, by the segmentation of a DTM (digital terrain model). We propose a new algorithm (called dual rank) to extract the ground in the DTM, which can be seen as an extension of the gray opening. The extraction of high objects can simply be done via thresholding using the preprocesse...

Digital terrain model (DTM) generation is the fundamental application of airborne Lidar data. In past decades, a large body of studies has been conducted to present and experiment a variety of DTM generation methods. Although great progress has been made, DTM generation, especially DTM generation in specific terrain situations, remains challenging. This research introduces the general principle...

The introduction of laser scanning has triggered off a revolution in topographic terrain capturing, especially in the generation of digital terrain models (DTM). In this article refined methods for the restitution of airborne LIDAR data are presented which have been developed at the Institute of Photogrammetry and Remote Sensing (Institut für Photogrammetrie und Fernerkundung, I.P.F.) at Vienna...