نتایج جستجو برای: sky view factor
تعداد نتایج: 1110906 فیلتر نتایج به سال:
The present paper belongs to a line of research known as aerial archaeology and compares some specific visualizations LIDAR data (hill-shading, openness, sky view factor) understand which them can provide the best approach suitably identify unveil archaeological permanences function different boundary conditions. In case, such belong very special material heritage consisting "physical traces" G...
The Sloan Digital Sky Survey (SDSS) currently provides by far the largest homogeneous sample of intermediate signal-to-noise ratio (S/N) optical spectra of galaxies and quasars. The fully automated SDSS spectroscopic reduction pipeline has provided spectra of unprecedented quality that cover the wavelength range 3800 − 9200 Å. However, in common with spectra from virtually all multi-object surv...
The Energetic X-ray Imaging Survey Telescope (EXIST) is a proposed mission to conduct an all-sky imaging hard x-ray (HX) survey (-5-600 keV) with ~0.05mCrab sensitivity (5a; 6mo.; ~5-100keV) comparable to the ROSAT soft x-ray survey, and to provide the maximum sensitivity and resolution (spatial and temporal) HX imager as the Next Generation GRB mission. Its primary science goals are to i) iden...
High concentrations of ozone (O3) is a major air problem in urban areas, which creates serious threat to human health. Urban street canyon morphology plays key role pollutant dispersion and photochemical reaction rate. In this study, one-year observation at three height levels was performed investigate the O3 distribution vertically Shenyang. Then, field investigation ENVI-met modelling were co...
Recently Schlegel, Finkbeiner & Davis published an all-sky reddening map based on the COBE/DIRBE and IRAS/ISSA infrared sky surveys. Using the reddening map of Baade’s Window and sample of 19 low-latitude (|b| < 5 deg) Galactic globular clusters I find that the DIRBE/IRAS reddening map overestimates E(B − V ) at low galactic latitudes by a factor of ∼ 1.35. I also demonstrate the usefulness of ...
We propose a layered street view model to encode both depth and semantic information on street view images for autonomous driving. Recently, stixels, stix-mantics, and tiered scene labeling methods have been proposed to model street view images. We propose a 4-layer street view model, a compact representation over the recently proposed stix-mantics model. Our layers encode semantic classes like...
We examine a new method of façade segmentation in a multi-view scenario. A set of overlapping, thus redundant street-side images exists and each image shows multiple buildings. A semantic segmentation identifies primary areas in the image such as sky, ground, vegetation, and façade. Subsequently, repeated patterns are detected in image segments previous labeled as “façade areas” and are applied...
We consider the effect of lensing magnification on high redshift sources in the case that magnification varies on the sky, as expected in wide fields of view or within observed galaxy clusters. We give expressions for number counts, flux and flux variance as integrals over the probability distribution of the magnification. We obtain these through a simple mapping between averages over the obser...
The all-sky monitor on the Rossi X-Ray Timing Explorer has been monitoring the sky in the 1.5–12 keV band since late February. The instrument consists of three coded-aperture cameras that can be rotated to view different regions by a motorized drive assembly. Intensities of 1100 known sources are obtained via least-squares fits of shadow patterns to the data and compiled to form X-ray light cur...
This study describes a novel, vision-based method for automatically obtaining the 3-DOF attitude of an aircraft. A very wide-angle view of the environment is captured and the input images are classified into fuzzy sky and ground regions using the spectral and intensity properties of the pixels. A novel approach to obtaining the 2-DOF attitude of the aircraft from the classified images is descri...
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