We investigate the effect of moisture on the dielectric permittivity and surface roughness with backscatter response from four different barefaced terrain. They represent four classes in the Wentworth grain size classification scale. We improve on previous technique used to remotely identify oil sand reservoirs through accurate modeling of the terrain electromagnetic (EM) reflectivity. First we...

The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft completed three flybys of Mercury in 2008–2009. During the first and third of those flybys, MESSENGER passed behind the planet from the perspective of Earth, occulting the radio-frequency (RF) transmissions. The occultation start and end times, recovered with 0.1 s accuracy or better by fitting edgediffract...

There are conflicting reports as to whether the shape of the psychometric relation between perceived roughness and tactile element spacing [spatial period (SP)] follows an inverted U-shape or a monotonic linear increase. This is a critical issue because the former result has been used to assess neuronal codes for roughness. We tested the hypothesis that the relation's shape is critically depend...

Terrain representation is a basic topic in the field of interactive graphics. The amount of data required for a good quality of the terrain offers an important challenge to developers of such systems. For users of these applications, the accuracy of geographical data is generally less important than its natural visual appearance. This makes it possible to maintain a limited geographical databas...

This paper develops a maximum a posteriori (MAP) probability estimation framework for shape-from-shading (SFS) from synthetic aperture radar (SAR) images. The aim is to use this method to reconstruct surface topography from a single radar image of relatively complex terrain. Our MAP framework makes explicit how the recovery of local surface orientation depends on the whereabouts of terrain edge...

RÉSUMÉ. Les phases amont des projets de conception peuvent être des périodes propices à l’introduction d’innovations technologiques dans les produits. Lors de ces phases, les processus de coopération et de confrontation des différents points de vue entre les acteurs impliquent des échanges d’informations qui sont parfois informels, non contractuels et peu ou pas structurés. Pourtant, ces phases...

Abstract. A complex and varied terrain has a great impact on the distribution of wind energy resources, resulting in uncertainty accurately assessing resources. In this study, three speed distributions kernel, Weibull, Rayleigh type for estimating average power density were first compared by using meteorological tower data from 2018 to 2020 under desert steppe contexts northern China. Then key ...

Introduction Conclusions References Tables Figures Back Close Abstract Introduction Conclusions References Tables Figures Back Close Abstract The urban boundary layer (UBL), in comparison with " rural " homogeneous atmospheric boundary layers, is characterised by greatly enhanced mixing, resulting from both the large surface roughness and increased surface heating, and by horizontal heterogene-...

Terrain visualization has been an interesting issue for graphics people for long, and there have been a lot of attempts in various ways for more e cient visualization. In most of the works the terrain data was considered as a triangular mesh as it is, or as an implicit surface in which the original shape(topology) of the terrain can be slightly changed. Recently, the Morse Theory, [1, 2], has b...