نتایج جستجو برای: sky quality
تعداد نتایج: 770845 فیلتر نتایج به سال:
Ground-based optical astronomy necessarily involves sensing the light of astronomical objects along with contributions many natural sources ranging from Earth’s atmosphere to cosmological light. In addition, astronomers have long contended artificial pollution, which further adds ‘background’ against are seen. Understanding brightness night sky is therefore fundamental astronomy. The last compr...
In the context of monitoring abundance of artificial light at night, the year-to-year stability of Sky Quality Meters (SQMs) is investigated by analysing intercalibrations derived from two measurement campaigns that were held in 2011 and 2012. An intercalibration comprises a light sensitivity factor and an offset for each SQM. The campaigns were concerned with monitoring measurements, each last...
The Northern Sky Variability Survey (NSVS) is a temporal record of the sky over the optical magnitude range from 8 to 15.5. It was conducted in the course of the first-generation Robotic Optical Transient Search Experiment (ROTSE-I) using a robotic system of four comounted unfiltered telephoto lenses equipped with CCD cameras. The survey was conducted from Los Alamos, New Mexico, and primarily ...
Outdoor scene parsing models are often trained on ideal datasets and produce quality results. However, this leads to a discrepancy when applied to the real world. The quality of scene parsing, particularly sky classification, decreases in night time images, images involving varying weather conditions, and scene changes due to seasonal weather. This project focuses on approaching these challenge...
We calculate photometric redshifts from the Sloan Digital Sky Survey Main Galaxy Sample, The Galaxy Evolution Explorer All Sky Survey, and The Two Micron All Sky Survey using two new training–set methods. We utilize the broadband photometry from the three surveys alongside Sloan Digital Sky Survey measures of photometric quality and galaxy morphology. Our first training–set method draws from th...
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 objective of this work is to quantitatively verify the quality of COAMPS clear-sky forecasts in terms of the position and timing of clear-sky events primarily over the Pacific Ocean. The results will be communicated in terms of the systematic biases as well as the ability to predict clear periods over a range of spatial scales. The feasibility of applying statistical forecasts and/or physic...
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