High-resolution satellite imagery (HRSI) is being increasingly employed for large-scale topographic mapping, and especially for geodatabase updating. As the spatial resolution of HRSI sensors increases, so the potential georeferencing accuracy also improves. However, accuracy is not a function of spatial resolution alone, as it is also dependent upon radiometric image quality, the dynamics of t...

This article is dedicated to the design of a linear-circular regression technique and to its application to ground-based GNSS-Reflectometry (GNSS-R) altimetry. The altimetric estimation is based on the observation of the phase delay between a GNSS signal sensed directly and after a reflection off of the Earth’s surface. This delay evolves linearly with the sine of the emitting satellite elevati...

OBJECTIVE Falls from height cause significant mortality in the urban environment, but reliable prognostic factors have not been identified. Even the intuitive relation between the distance fallen and mortality rate has been questioned. Our objective was to determine factors predictive of increased mortality rate in victims of falls from height. DESIGN Clinical observational study, retrospecti...

The research studied the comparison of night air temperatures and atomic oxygen airglow intensities at mesopause obtained with satellite ground-based instruments. Satellite data used in this study were SABER limb-scanning radiometer operating aboard TIMED satellite. Data monitoring using KEO Scientific “Arinae” Fabry–Pérot interferometer adapted for aeronomic research. Since an detects paramete...

Most of the spectrum occupancy measurement campaigns performed to the date in the context of cognitive radio are based on measurements in outdoor high points such as building roofs, balconies and towers. Although these measurement scenarios enable a more accurate estimation of the primary transmitters’ spectral activity, they may not be representative of the spectrum occupancy perceived by a co...

In this paper, we propose a method to segment the ground plane from a mobile robot’s visual field of view and then measure the height of non-ground plane features (even raw pixels) above the mobile robot’s ground plane. Thus a mobile robot can determine what it can drive over, what it can drive under, and what it needs to manoeuvre around. In addition to obstacle avoidance, this data could also...

Several Herbrand proof procedures proposed during the 1960 decade are shown to be related in varying degrees. Most of the paper deals with a relationship between s-linear resolution and model elimination. Refinements of each are proposed and the spaces of ground deductions are shown to be isomorphic in a suitable sense. The two refined procedures are then studied at the general level where they...

Thermokarst is the process of ground subsidence caused by either the thawing of ice-rich permafrost or the melting of massive ground ice. The consequences of permafrost degradation associated with thermokarst for surface ecology, landscape evolution, and hydrological processes have been of great scientific interest and social concern. Part of a tundra patch affected by wildfire in northern Alas...