This paper presents a research and development project that will provide an extension to 2D geo-databases for handling large terrain data. It first discusses application requirements and system design, and then elaborates system architecture for optimal data organization and updating, efficient multi-resolution queries, and dynamic DTM generation. It then addresses technical issues related to d...

We introduce a novel ultra-high-resolution Digital Terrain Model (DTM) processing system using combination of photogrammetric 3D reconstruction, image co-registration, super-resolution restoration, shape-from-shading DTM refinement, and co-alignment methods. Technical details the method are described, results demonstrated 4 m/pixel Trace Gas Orbiter Colour Stereo Surface Imaging System (CaSSIS)...

Abstract. Surface roughness influences the release of avalanches and dynamics rockfall, debris flow, but it is often not objectively implemented in natural hazard modelling. For two study areas, a treeline ecotone windthrow-disturbed forest landscape European Alps, we tested seven algorithms using photogrammetric digital surface model (DSM) with different resolutions (0.1, 0.5 1 m) moving-windo...

Abstract. Height models are a fundamental part of the geo-information required for various applications. The determination height by aerial photogrammetry, LiDAR or space images is time-consuming and expensive. For with large area coverage, UAVs not economic. freely available ASTER GDEM-3, SRTM, AW3D30 TDM90 can meet requirements.With exception ASTER-GDEM-3, which cannot compete other, digital ...

In this study, rockfall risks in Murtaza village, which is located within the central district of Niğde province and where active events are experienced, were evaluated using a high-resolution digital terrain model (DTM) created based on unmanned air vehicle (UAV) images, field measurement data, three dimensional (3D) models. During studies, 14 rock blocks that danger falling identified geometr...

The most commonly used topographic vector data, the core data of a geographic information system (GIS) are currently twodimensional. The topography is modelled by different objects which are represented by single points, lines and areas with additional attributes containing information, for example on function and size of the object. In contrast, a digital terrain model (DTM) in most cases is a...

Forest inventories play an important role in enabling informed decisions to be made for the management and conservation of forest resources; however, process collecting inventory information is laborious. Despite advancements mapping technologies allowing forests digitized finer granularity than ever before, it still common measurements collected using simple tools such as calipers, measuring t...

A digital terrain model (DTM) is a representation of surface relief encoded in a format which can be analysed by computer. DTMs can be created using any data set which consists of a number of geographi_cal co-ordinates with an elevation or quantity attached to each position. Data which have been represented in this way are topography, meteorological statistics (e.g. rainfall, evaporation and te...