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Coesfeld, J.; Anderson, S.; Baugh, K.; Elvidge, C.; Schernthanner, H.; Kyba, C. |
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Title |
Variation of Individual Location Radiance in VIIRS DNB Monthly Composite Images |
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Journal Article |
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2018 |
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Remote Sensing |
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Remote Sensing |
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10 |
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12 |
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1964 |
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Remote Sensing; Instrumentation |
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With the growing size and use of night light time series from the Visible Infrared Imaging Radiometer Suite Day/Night Band (DNB), it is important to understand the stability of the dataset. All satellites observe differences in pixel values during repeat observations. In the case of night light data, these changes can be due to both environmental effects and changes in light emission. Here we examine the stability of individual locations of particular large scale light sources (e.g., airports and prisons) in the monthly composites of DNB data from April 2012 to September 2017. The radiances for individual pixels of most large light emitters are approximately normally distributed, with a standard deviation of typically 15–20% of the mean. Greenhouses and flares, however, are not stable sources. We observe geospatial autocorrelation in the monthly variations for nearby sites, while the correlation for sites separated by large distances is small. This suggests that local factors contribute most to the variation in the pixel radiances and furthermore that averaging radiances over large areas will reduce the total variation. A better understanding of the causes of temporal variation would improve the sensitivity of DNB to lighting changes. |
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2072-4292 |
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GFZ @ kyba @ |
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2129 |
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Collison, F.M.; Poe, K. |
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Title |
“Astronomical Tourism”: The Astronomy and Dark Sky Program at Bryce Canyon National Park |
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Journal Article |
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2013 |
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Tourism Management Perspectives |
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Tourism Management Perspectives |
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7 |
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1-15 |
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Astronomy-related tourism; National parks; Night sky darkness; astrotourism; dark skies |
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Astronomical tourism represents a less-studied segment of sustainable tourism, where a dark night sky is the underlying resource. This article evaluates an astronomical tourism program, in this case at a national park with dark skies for observing. Bryce Canyon National Park (BCNP) in the southwestern United States has a well-developed astronomy program to serve visitors. The program consists of solar viewing during the day, multimedia evening programs, and night-time star gazing with telescopes. Depending on the specific measure used, it appears that up to 10% of park visitors may be involved with the formal Astronomy and Dark Sky Program and/or more informal astronomy activities. BCNP appears well positioned to take advantage of the dark sky attributes of the park and to educate visitors about the importance of maintaining and/or increasing the darkness of night skies. Potential future developments in the program may serve to further increase the number of visitors to BCNP. |
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School of Travel Industry Management, 1901 Ruby Lane, Liberty, MO 64068; collison(at)hawaii.edu |
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2211-9736 |
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IDA @ john @ |
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128 |
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Columella, L.J.M. |
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Of husbandry |
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70 |
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Book 9 |
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Animals |
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Excerpt from Chapter 14, page 409 in the linked English translation:
...Therefore, at the time when the mallows blossom, when there is the greatest multitude of these butterflies, if a high brazen vessel, with a narrow neck like the mile-column, be placed in the evening among the bee-hives, and some light put down to the bottom of it, the butterflies gather together to it from all places; and, while they flutter about the small flame, they are scorched, because they can neither fly easily upward out of the narrow place, nor, on the other hand, can they retire at a greater distance from the fire, since they are surrounded by the sides of the brazen vessel: therefore they are consumed by the burning heat that is near them... |
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De re rustica |
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GFZ @ kyba @ |
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2578 |
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Commons, J.R. |
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Municipal Electric Lighting |
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1897 |
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Mun. Aff. |
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1 |
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GFZ @ kyba @ |
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2409 |
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Cottam, C. |
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A shower of grebes |
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1929 |
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The Condor |
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31 |
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1 |
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80-81 |
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Animals; Birds |
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GFZ @ kyba @ |
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2424 |
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