Chandra Clarke

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Can You Spot a City?

December 18, 2014 By Chandra Clarke Leave a Comment

320px-Earth_at_NightThe researchers at the Extragalactic Astrophysics and Astronomical Instrumentation Group at the Universidad Coplutense de Madrid need your help to georeference the position of cities that appear in ISS images.

According to Jose Gomez Castano, the “Lost at Night” project is part of a study of light pollution and the energy consumption derived from it.

“We use images taken from the International Space Station as part of our investigations, provided by Earth Science and Remote Sensing Unit, NASA-Johnson Space Center,” says Castano. “To compare the images with the different light sources on the earth, we need to know the city’s location. Due to the large number of images, we need your help. Some of these pictures are from unknown locations for us, and it is very difficult to identify them in the pictures. However, a lot of people around the world will know the cities. We need you to identify the cities and connect them with their position point on the map.”

When you participate, the ISS image will be loaded in the left panel, and a map will appear at the right. You will be able to zoom in and out, drag, and rotate the image if that helps you identify what you’re seeing. If you think you know the city, click on the map to identify its position. You can then save and move on. If the picture stumps you, you can simply click on “Don’t Know.”

You can also get more information by reviewing the ISS picture data provided, or call on your friends by sharing the image on Twitter.

 

 

 

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Light pollution? There’s an app for that

April 30, 2013 By Chandra Clarke Leave a Comment

Light pollution It's not pretty
What you’re missing: The constellation Orion, imaged at left from dark skies, and at right from Orem, UT a city of about half a million people. (Photo credit: Wikipedia)

City dwellers might not realize it, but they’re missing out on some great views… of the sky. Light pollution from sources like street lights and advertising marquees washes out all but the brightest of stars.

A new app just released for the Android OS, called “The Loss of the Night” is designed to find out exactly how bad the light pollution is. The app helps measure skyglow by learning which stars are visible or invisible to the naked eye at the user’s location.

According to Christopher Kyba of the Institute for Space Sciences at Freie Universität Berlin, it works like a game — it guides you to a certain star and asks if you can see it. Based on your response it then asks you for a new star that’s either brighter or darker.

In addition to helping scientists quantify the problem, there’s a benefit to the user. “People who use the app also find that they end up learning the names of stars and constellations that they didn’t know before,” said Kyba.

Android users can download the app from this link at Google Play. The “Loss of the Night” app was produced by the Verlust der Nacht collaboration.

iPhone users, meanwhile, can also contribute. The Dark Sky Meter project, set up by Norbert Schmidt, Mario Hodzelmans, and Harro Treur, helps measure the sky directly using the iPhone camera, and there’s a lite version and a pro version to chose from.

Image by Jeremy Stanley under CC BY licensing

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