نتایج جستجو برای: terrain attributes

تعداد نتایج: 84446  

Journal: :Remote Sensing 2017
Craig Mahoney Christopher Hopkinson Natascha Kljun Eva van Gorsel

Spaceborne laser altimetry waveform estimates of canopy Gap Fraction (GF) vary with respect to discrete return airborne equivalents due to their greater sensitivity to reflectance differences between canopy and ground surfaces resulting from differences in footprint size, energy thresholding, noise characteristics and sampling geometry. Applying scaling factors to either the ground or canopy po...

2017
Endre Hofstad Hansen Liviu Theodor Ene Terje Gobakken Hans Ole Ørka Ole Martin Bollandsås Erik Næsset

Forest attributes such as tree heights, diameter distribution, volumes, and biomass can be modeled utilizing the relationship between remotely sensed metrics as predictor variables, and measurements of forest attributes on the ground. The quality of the models relies on the actual relationship between the forest attributes and the remotely sensed metrics. The processing of airborne laser scanni...

2002
John C. Trinder Ping Wang Yi Lu Eric D. Cheng

The paper describes aspects of research being undertaken on the determination and processing of digital elevation models. A 2-D Kalman filter has been developed based on dynamic and functional models for a grid DEM, to produce optimal estimates of terrain attributes of a DEM point using the relevant observations, and predictions derived from its orthogonal neighbouring points. A further method ...

2006
Henrik Buchholz Jürgen Döllner Lutz Ross Birgit Kleinschmit

Elements of urban terrain models such as streets, pavements, lawns, walls, and fences are fundamental for effective recognition and convincing appearance of virtual 3D cities and virtual 3D landscapes. These elements complement important other components such as 3D building models and 3D vegetation models. This paper introduces an object-oriented, rule-based and heuristic-based approach for mod...

1994
Hyeongseok Ko Barry D. Reich Norman I. Badler

We describe a real-time model of terrain traversal by simulated human agents. Agent navigation includes a variety of simulated sensors, terrain reasoning with behavioral constraints, and detailed simulation of a variety of locomotion techniques. Our Kinematic Locomotion Generation Module (KLOG) generates various terrain navigation skills as well as both rhythmic and non-rhythmic variations of t...

2007
J. LATGER H. J. MAMETSA A. BERGES

Tools for electromagnetic simulation, such as SPECRAY EM / FERMAT, a jointed development of OKTAL SE company and French ONERA EM research centre, are well adapted to RCS or ISAR image computations down to millimetre wavelength for high realistic targets described using detailed CAD files. Moreover, this type of tool can be efficiently used in order to compute the same RCS of targets but taking ...

Journal: :Simulation 2012
Haluk Topcuoglu Murat Ermis Ilker Bekmezci Mesut Sifyan

A wireless multimedia sensor network (WMSN) is a network of wirelessly interconnected sensors that can gather multimedia information, such as sound and vision. One of the most important design issues of a WMSN is to maximize the coverage, while preserving the network connectivity. Although there are many studies about coverage for WMSNs, most of them are based on two-dimensional terrain assumpt...

Journal: :The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2021

Abstract. Semantic 3D city models are increasingly applied for a wide range of analysis and simulations large urban areas. Such used as foundation development digital twins, representing with high accuracy the landscapes areas well dynamic in terms processes events. In this context, paper presents model, which is starting point twin Sofia city. The model compliant CityGML 2.0 LOD1, supporting i...

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