File:The Evolution of Tucson City Lights (panoramic version) (noao-04868).jpg
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DescriptionThe Evolution of Tucson City Lights (panoramic version) (noao-04868).jpg |
English: These three images taken in 1959, 1980 and 2003 show the evolutionary change and growth of the artificial lights emitted by the greater Tucson area and the communities to north and south, as seen from Kitt Peak National Observatory, about 56 miles (90 kilometers) southwest of the downtown area. Although the light emission has obviously grown, qualitatively, it appears to have lagged the explosive growth in Tucson's population during this period. Light pollution control ordinances and outstanding public cooperation have limited stray light to the extent that Kitt Peak remains a world-class astronomical site. The ghost image just slightly visible to the naked eye in the foreground of the image is actually a series of daylight exposures that demonstrate the location of the mountain ranges between Kitt Peak and Tucson. This is a very large image: the section directly towards Tucson is separately available. |
Date | 30 June 2020, 21:53:00 (upload date) |
Source | The Evolution of Tucson City Lights (panoramic version) |
Author | Bill Schoening, J.C.Golson, Mark Hanna and NOIRLab/NSF/AURA/ |
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Credit/Provider | Bill Schoening, J.C.Golson, Mark Hanna and NOIRLAB/NSF/AURA/ |
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Date and time of data generation | 21:53, 30 June 2020 |
JPEG file comment | evolution of tucson city lights as seen from kitt peak panoramic. shot by bill schoening&J.C. Golson, scanned and assembled by mark hanna. there is a data dvd more complete than this if the fireproof file cabinet.
Feb. 19, 2004 The film processing used over the years was all unavoidably different. 1959 exposure was made using Polaroid negative/positive film material. I would guess the 1959 shot was made on a night when the moon was pretty bright because you can see good mountain detail, you can even see the Rincon Mountains at the far east horizon. The 1980 series were processed by the Kitt Peak Photo Lab in the Kodak Versamat processor we had at the time, using Kodak VersaFlo chemistry at recommended processing times for the film. The 2003 series was sent out to be processed, check Bill Schoening's notes to find out where it was sent . His notes also contain information about which film was used over the years and the exposure he used, I think it was 10 minutes each time. Bill used the same lens every time and that helped. In the future they daylight shots should be taken at near the same time of day every time, probably between 1 & 2 in the afternoon. The variable processing used over the years made this project especially tricky. I tried my best to treat each set as accurately as I could. I tried to keep the density of the black in the valley between Kitt Peak and the next mountains to the east the same on all sets, this area seems to show now change at all over the last 40 years. That would allow the change in sky brightness over the city to be believable. The 1959 film was printed until the night sky was nearly black because there was obviously little scattered light back then, this also compensated for the bright moon condition. The ghost images (made from the daylight exposures) used for 1980 and 2003 are to show the mountain ranges more clearly. They help explain why there are clear cut locations where some lights seem to just stop in the panoramas. The ghost layers densities are slightly changeable by changing the layer opacity in PhotoShop. The ghost layer for 2003 was duplicated and used for 1980. The gaps that are visible are because there was not enough overlap when those exposures were made, probably because the camera mount rotated slightly during the changing of the film. |
Software used | Adobe Photoshop CS Macintosh |
File change date and time | 13:23, 11 May 2004 |
Date and time of digitizing | 08:33, 3 March 2004 |
Date metadata was last modified | 06:23, 11 May 2004 |
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IIM version | 4 |