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Author |
Gwiazdsinski, L.; Straw, W. |
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Title |
Nights and Mountains. Preliminary Explorations of a Double Frontier |
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Journal Article |
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2018 |
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Revue de géographie alpine |
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rga |
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106 |
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1 |
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Commentary; Darkness |
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0035-1121 |
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Call Number |
GFZ @ kyba @ |
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1866 |
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Author |
Challéat, S.; Lapostolle, D.; Milian, J. |
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Title |
The Night-time Environment in French Mountain Areas. A Resource and a Transition Operator Towards Sustainability |
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Journal Article |
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Year |
2018 |
Publication |
Revue de géographie alpine |
Abbreviated Journal |
rga |
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106 |
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1 |
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Keywords |
Darkness; Society |
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This article presents our approach to construct the night-time environment (NE) as an interdisciplinary research subject. Understood within the framework of various French mountain areas, we show that the NE is highly indicative of different development trajectories. We analyse them by combining traditional social science research into territory with the ecosystem approaches of the experimental sciences. We show how the NE resource (NER) is transformed into an operator that facilitates the transition towards sustainability. By highlighting three of the NE’s specifications, this work lays the groundwork for a transdisciplinary approach. |
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0035-1121 |
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GFZ @ kyba @ |
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1867 |
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Author |
Petržala, J. |
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Title |
Feasibility of inverse problem solution for determination of city emission function from night sky radiance measurements |
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Journal Article |
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Year |
2018 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
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Journal of Quantitative Spectroscopy and Radiative Transfer |
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213 |
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86-94 |
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Skyglow |
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The knowledge of the emission function of a city is crucial for simulation of sky glow in its vicinity. The indirect methods to achieve this function from radiances measured over a part of the sky have been recently developed. In principle, such methods represent an ill-posed inverse problem. This paper deals with the theoretical feasibility study of various approaches to solving of given inverse problem. Particularly, it means testing of fitness of various stabilizing functionals within the Tikhonov’s regularization. Further, the L-curve and generalized cross validation methods were investigated as indicators of an optimal regularization parameter. At first, we created the theoretical model for calculation of a sky spectral radiance in the form of a functional of an emission spectral radiance. Consequently, all the mentioned approaches were examined in numerical experiments with synthetical data generated for the fictitious city and loaded by random errors. The results demonstrate that the second order Tikhonov’s regularization method together with regularization parameter choice by the L-curve maximum curvature criterion provide solutions which are in good agreement with the supposed model emission functions. |
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0022-4073 |
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1868 |
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Author |
Charlier, B. |
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Title |
“You Know the Pyrenees by Day – Come See Them by Night...” Reflections on in visu Artialisation of Nocturnal Skyscapes in the Pyrenees |
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Journal Article |
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Year |
2018 |
Publication |
Revue de géographie alpine |
Abbreviated Journal |
rga |
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106 |
Issue |
1 |
Pages |
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Keywords |
Society; Economics; Darkness |
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“Nocturnal skyscapes. You know the Pyrenees by day – come see them by night... ”: thus the title of an exhibition of photographs set up in 2012 by the Pays de Lourdes et des Vallées des Gaves (Hautes-Pyrénées département) to help raise public awareness about the project for the Pic du Midi International Dark Sky Reserve (IDSR), mainly among the local population and stakeholders in the areas concerned.
Although its evocative title might suggest otherwise, this is rather more than an exhibition on the iconic sites of the Pyrenees seen at night. What it seems to do is to bring out new landscapes that are not just “mountainscapes at night”, or simply night-time versions of landscapes seen by day.
The night skies that characterise these landscapes therefore represent an new category, they need to be considered in their entirety as conveying a meaning that encompasses all that is both construed and material in our relationships with landscape. As in many areas with similar projects either in place (North America, Europe) or emerging (the Cévennes and Mercantour national parks in France, for example), the creation of the Pic du Midi IDSR will have helped to bring a new kind of “landscape object” (Besse, 2009) into being in the Pyrenean region. |
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0035-1121 |
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GFZ @ kyba @ |
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1869 |
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Author |
Kyba, C.C.M. |
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Title |
Is light pollution getting better or worse? |
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Journal Article |
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Year |
2018 |
Publication |
Nature Astronomy |
Abbreviated Journal |
Nat Astron |
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Volume |
2 |
Issue |
4 |
Pages |
267-269 |
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Keywords |
Skyglow; Commentary |
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Awareness of light pollution is spreading, but with changing lighting technologies, emissions are shifting to wavelengths our current measuring devices cannot assess well. Community involvement is essential to evaluate changes in sky brightness. |
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2397-3366 |
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GFZ @ kyba @ |
Serial |
1870 |
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