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Wicht, M.; Kuffer, M. |
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Title |
The continuous built-up area extracted from ISS night-time lights to compare the amount of urban green areas across European cities |
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Journal Article |
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Year |
2019 |
Publication |
European Journal of Remote Sensing |
Abbreviated Journal |
European Journal of Remote Sensing |
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52 |
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58-73 |
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Keywords |
Remote Sensing; continuous built-up area; Planning; International Space Station; ISS; Nighttime light |
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Abstract |
The presence of urban green areas significantly impacts urban inhabitants’ well-being. However, comparative studies across European cities are constraint by urban administrative boundaries, which commonly do not match the continuous built-up urban area. This makes comparative research on environmental indicators very problematic, as administrative boundaries are not usually appropriate to define the urban human environment. Therefore, this study aimis to explore the use of night-time light (NTL) images of the International Space Station (ISS) to delineate the continuous built-up area (CBA) of selected European cities to calculate the urban green area share per alternatively derived city extent. The result of the CBA shows that NTL images provide a robust data source to make the urban extent of European cities comparable. By comparing results of different datasets on green areas, we discuss the limitations of existing indicators and opportunities for new ones. Results show that green areas are rarely in close proximity to human living environment, even though the share of urban green areas within the CBA might be larger, as in comparison to the administrative boundary. We conclude that ISS NTL imagery is very suitable for mapping the CBA when aiming at comparability of environmental indicators across cities. |
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2279-7254 |
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GFZ @ kyba @ |
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2506 |
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Author |
Davoudian, N. |
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Title |
Background lighting clutters: how do they affect visual saliency of urban objects? |
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Journal Article |
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Year |
2017 |
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International Journal of Design Creativity and Innovation |
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International Journal of Design Creativity and Innovation |
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5 |
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1-2 |
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95-103 |
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Vision |
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The current study aims to create some general guidance for designers to better understand the impact of background lighting in their design and as a result minimize its effect on the visual saliency of urban objects. There are few studies about how lighting clutters can affect and decrease the visual saliency of illuminated urban objects at night. Lack of information in this area has resulted in increasing luminance to be recognized as one of the main tools to enhance the saliency of urban objects at night. To address this matter a study was performed to investigate the effect of proximity of lighting clutters on visual saliency of urban objects. A forced choice pair comparison method was employed, in which two test images of an urban object in different conditions of luminance contrast and proximity of light patterns were compared. Test participants reported in which image the target appeared more salient. Results show there is a progressive increase in saliency value by increasing the gap between the target and the background lighting when the luminance contrast of the target is three or higher. However, the critical area around the object with the highest effect lies between 0.5° and 1° visual angle. Removing light patterns beyond that point creates negligible effect. The findings of this study could inform development of future models of visual recognition in the road environment, models which can address the important effects of environmental context in addition to photometric variables (luminance and contrast) that are the only factors considered in traditional models of ‘Visibility Level.’ |
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2165-0349 |
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GFZ @ kyba @ |
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2527 |
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Stone, T. |
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Light Pollution: A Case Study in Framing an Environmental Problem |
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Journal Article |
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2017 |
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Ethics, Policy & Environment |
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Ethics, Policy & Environment |
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20 |
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3 |
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279-293 |
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Society |
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Light pollution is a topic gaining importance and acceptance in environmental discourse. This concept provides a framework for categorizing the adverse effects of nighttime lighting, which advocacy groups and regulatory efforts are increasingly utilizing. However, the ethical significance of the concept has, thus far, received little critical reflection. In this paper, I analyze the moral implications of framing issues in nighttime lighting via the concept of light pollution. First, the moral and political importance of problem framing is discussed. Next, the origins and contemporary understandings of light pollution are presented. Finally, the normative limitations and practical ambiguities of light pollution are discussed, with the aim of strengthening the framework through which decisions about urban nighttime lighting strategies are increasingly approached. |
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2155-0085 |
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GFZ @ kyba @ |
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2226 |
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Author |
Shi, L.; Foody, G.M.; Boyd, D.S.; Girindran, R.; Wang, L.; Du, Y.; Ling, F. |
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Title |
Night-time lights are more strongly related to urban building volume than to urban area |
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Journal Article |
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2020 |
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Remote Sensing Letters |
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Remote Sensing Letters |
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11 |
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1 |
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29-36 |
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Keywords |
Remote Sensing; Urban; Night Lights |
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A strong relationship between night-time light (NTL) data and the areal extent of urbanized regions has been observed frequently. As urban regions have an important vertical dimension, it is hypothesized that the strength of the relationship with NTL can be increased by consideration of the volume rather than simply the area of urbanized land. Relationships between NTL and the area and volume of urbanized land were determined for a set of towns and cities in the UK, the conterminous states of the USA and countries of the European Union. Strong relationships between NTL and the area urbanized were observed, with correlation coefficients ranging from 0.9282 to 0.9446. Higher correlation coefficients were observed for the relationship between NTL and urban building volume, ranging from 0.9548 to 0.9604; The difference in the correlations obtained with volume and with area was statistically significant at the 95% level of confidence. Studies using NTL data may be strengthened by consideration of the volume rather than just area of urbanized land. |
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Key Laboratory for Environment and Disaster Monitoring and Evaluation, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China; shilingfei14(at)mails.ucas.ac.cn |
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Taylor & Francis |
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English |
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English |
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2150-704X |
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IDA @ john @ |
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2783 |
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Author |
Li, X.; Li, X.; Li, D.; He, X.; Jendryke, M. |
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Title |
A preliminary investigation of Luojia-1 night-time light imagery |
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Journal Article |
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Year |
2019 |
Publication |
Remote Sensing Letters |
Abbreviated Journal |
Remote Sensing Letters |
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Volume |
10 |
Issue |
6 |
Pages |
526-535 |
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Keywords |
Remote Sensing; Instrumentation |
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Launched on 2 June 2018, Luojia-1 satellite records night-time light imagery at 130 m resolution, which is higher than most of the existing night-time light images to date. This study evaluated radiometric and spatial properties of the Luojia-1 satellite imagery for cities of Los Angeles, Wuhan and Rome as well as the change detection capability for Zunyi city. For the radiometric property, the analysis shows that the Luojia-1 images correlate well with the radiance of the Visible Infrared Imaging Radiometer Suite (VIIRS)’s Day and Night Band (DNB), and that the Luojia-1 images have a wider range of radiance values, as well as higher radiance values (e.g., 40%–90% higher) than the VIIRS DNB images. Using wavelet decomposition and change detection analysis to evaluate spatial property and change detection capability, it was found that the Luojia-1 images provide abundant spatial detail information, with about 20%–54% energy of wavelet component of the images stored in 100–400 m resolutions, and they can help to track the electrification of new roads and buildings at a fine resolution. This study shows that the Luojia-1 images are an effective data source for analysing spatiotemporal distribution of night-time light and its associated socioeconomic attributes. |
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2150-704X |
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GFZ @ kyba @ |
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2199 |
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