In this paper we consider the problem of DTM extraction in dense urban areas. To this aim, we need valuable and reliable data in the tiny open areas among buildings, and a suitable algorithm to reconstruct the terrain discarding these same structures. So, we compare first LIDAR and aerial photogrammetry by evaluating the relative accuracy of the three-dimensional reconstructed surface in the sm...

Nacrtak Earthwork usually represents the largest cost component in the construction of low-volume forest roads. Accurate estimates of earthwork volume are essential to forecast construction costs and improve the financial control of road construction operations. Traditionally, earthwork volumes are estimated using methods that consider ground data obtained from survey stations along road grade ...

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...

Modeling the anisotropic reflectance of snow will be important for various applications, like climatology, meteorology and water management. Accurate climatic and meteorological modeling of energy balance needs to take the anisotropic effect into account. This is also the case for accurate snow-cover mapping for water management. This paper describes the development of an empirical model for th...

to enhance the understanding of the impact of obstacle buildings on pollution transportationand dispersion in the atmospheric boundary layer, it is necessary to know the atmospheric flow characteristics over terrains. wind flow characteristics in a boundary layer over a step-shaped cliff topography model with rough and smooth surfaces were studied numerically using computational fluid dynamics ...

We may use ray-casting methods to render terrain from digital terrain models. In this paper we enhance a terrain renderer in several ways, including application of antialiasing techniques. Also we examine various aspects of antialiasing in terrain rendering. We summarize surface and color reconstruction models, and discuss several vertical antialiasing techniques, including supersampling and ar...