Oct 24

ALAN increasing

Artificially lit surface of Earth at night increasing in radiance and extent. Christopher C. M. Kyba, Theres Kuester, Alejandro Sánchez de Miguel et al. American Association for the Advancement of Science A central aim of the “lighting revolution” (the transition to solid-state lighting technology) is decreased energy consumption. This could be undermined by a rebound effect of […]

Mar 26

Georeferencing

Collaborative georeferencing of nighttime images taken from the ISS to study energy consumption and light pollution. University of Girona. Service GIS and Remote Sensing(2015) Full article

Feb 28

Thesis

Spatial, temporal and spectral variation of light pollution: Methodology and results (2015) Since 2007, Alejandro Sánchez de Miguel has been working on light pollution. With the help of José Gomez Castaño, Daniel Lombraña, other researchers and thousands of volunteers he could make the final chapter about Cities at Night protect. The thesis is written in […]

Jan 30

Modelling

Statistical modelling and satellite monitoring of upward light from public lighting In this work, we propose an approach to estimating the amount of light wasted by being sent towards the upper hemisphere from urban areas. This is a source of light pollution. The approach is based on a predictive model that provides the fraction of […]

Jan 29

gvSIG

Using gvSIG to compute light pollution from night satellite images Light pollution (introduced by humans, directly or indirectly, from artificial light into the environment) is a major issue worldwide, particularly in urban areas. It increases the sky glow and prevents us from observing a dark starry sky. There is also a direct relationship between light […]

Jan 1

HR Imagery

High-Resolution Imagery of Earth at Night: New Sources, Opportunities and Challenges Images of the Earth at night are an exceptional source of human geographical data, because artificial light highlights human activity in a way that daytime scenes do not. The quality of such imagery dramatically improved in 2012 with two new spaceborne detectors. The higher […]

Jan 1

Light pollution

Light pollution from the ground, the air and the space The sky brightness is one of the things that most harms astronomical observation, near cities and on mountain observatories. Currently there are several initiatives to control light pollution, but the sky brightness measurements are usually local. To exercise adequate control of light pollution is necessary […]

Jan 1

Atlas

Atlas of astronaut photos of Earth at night Astronauts have been taking photos of Earth for decades (Peit 2008), but the last few years have seen a dramaic increase in the quality of the imagery, paricularly at night. Nighime images oten have a large public resonance, perhaps because ariicial light at night is such a […]

Jan 1

Flux calibration

ISS nocturnal images as a scientific tool against Light Pollution: Flux calibration and colors Light Pollution studies with images of the Earth at night Digital pictures from ISS versus DMSP-OLS satellite data Absolute photometric calibration of nocturnal ISS pictures – Using sources at Earth- With standard stars (the astronomers way) Information extracted from colors of […]

Jan 29

Measuring LP in Spain

Measuring the pollution of the sky from space The result indicates that Spain had not only the most powerful lamps in Europe, according to the report data, but also, this could be seen in satellite images. Full article (in Spanish)