Mapping the Melatonin Suppression, Star Light and Induced Photosynthesis Indices with the LANcube

Aubé, Martin; Marseille, Charles; Farkouh, Ammar; Dufour, Adam; Simoneau, Alexandre; Zamorano, J.; Roby, Johanne; Tapia, C.

doi:10.20944/preprints202011.0347.v1

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…That experiment will require the measurement of the irradiance on a set of sites for which we computed the Illumina v2 irradiance spectra. We are expecting to perform that experiment with the LANcube radiometer [46] in the coming year. 3.…”

Section: Discussionmentioning

confidence: 99%

Modeling the Spectral Properties of Obtrusive Light Incident on a Window: Application to Montréal, Canada

Aubé

Houle

et al. 2021

Remote Sensing

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This paper describes the use of a new obtrusive light module of the Illumina v2 model to estimate the light that may enter bedroom windows. We used the following as input to the model: (1) the sources’ flux and spectrum derived from the color images taken by astronauts from the International Space Station (ISS), (2) an association between source spectrum and angular emission, and (3) a per zone inventory of obstacles properties and lamp height. The model calculates the spectral irradiance incident to buildings’ windows taking into account the orientation of the street. By using the color information from an ISS image, we can classify pixels as a function of their spectra. With the same image, it is also possible to determine the upward photopic radiance for each pixel. Both serve as inputs to the model to calculate the spectral irradiance on any window. By having the spectral irradiance, it is possible to determine the Melatonin Suppression Index and the photopic irradiance on the window. Such information can later be used to perform epidemiological studies. The new methodology is applied to the city of Montréal in Canada for a set of houses’ locations. The computations are made for 2013 (pre-LED era).

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Section: Discussionmentioning

confidence: 99%

Modeling the Spectral Properties of Obtrusive Light Incident on a Window: Application to Montréal, Canada

Aubé

Houle

et al. 2021

Remote Sensing

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“…The LANcube v2 is equipped with a WIFI interface which allows an access to the data from a mobile device. The LANcube v2 is developed in an open science approach so that the recipe to build the LANcube v2 along with its software is released under open licenses [13]. For a better power stability, the LANcube v2 has an integrated Uninterruptible Power Supply (UPS).…”

Section: The Lancube Vdevicementioning

confidence: 99%

“…Ideally, the measuring devices must be multispectral and multiangular. In the present work, we describe the use of such a sensor called LANcube [12,13] to characterize the properties of lighting devices located within 15 meters of a road or street.…”

Section: Introductionmentioning

confidence: 99%

Estimating lighting device inventories with the LANcube v2 multiangular radiometer

Aubé

Houle²

2023

IJSL

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This paper is a technical report describing the use of an open source instrument called LANcube v2 to estimate a lighting devices inventory. The LANcube v2 is and instrument having 5 color sensitive sensors, each on a face of a cube. The instrument can be mounted on a car roof in order to create a map of the artificial light at night while roaming the streets and roads. Based on the temporal variations of the detected signal on various cube’s faces, we developed a method of finding the approximate position in 3D of each source. The lamp spectral types can be determined relatively well thanks to the color balance of the raw Red (R), Green (G), Blue (B), and Clear (C) color bands. If one assumes a typical angular photometry of a source with respect to its location, it is possible to estimate roughly its current luminous flux. Such information allows us to build a lighting devices inventory of a territory. One advantage of that new method is that it can provide information about the private sources that are always excluded from public lighting inventories. We compared the inventory extracted with that new methodology with an in situ lamp inventory made for two villages in Canada. This comparison allow us to emphasize the strengths and limitations of the method by comparing to the ground truth. We actually found that we were able to detect 99% of the sources with flux higher than 1000 lumen and located within 15 meters from the road. We also found that we generally overestimate the height of the devices by 21 to 51% depending on the lamp photometry. This overestimate surely reflect in an overestimate of the fluxes. Finally, we found that the proposed method is very efficient to recognize the spectral type of the devices with 99% of success.

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“…The first version of the LAN 3 (LAN 3 v1) uses the Arduino open source microcontroller. All the required documentation to learn how to build the device is available online [26].…”

Section: The Lancube Systemmentioning

confidence: 99%

Mapping the Melatonin Suppression, Star Light and Induced Photosynthesis Indices with the LANcube

et al. 2020

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Increased exposure to artificial light at night can affect human health including disruption of melatonin production and circadian rhythms which can extend to increased risks of hormonal cancers and other serious diseases. In addition, multiple negative impacts on fauna and flora are well documented, and it is a matter of fact that artificial light at night is a nuisance for ground-based astronomy. These impacts are frequently linked to the colour of the light or more specifically to its spectral content. Artificial light at night is often mapped by using spaceborne sensors, but most of them are panchromatic and thus insensitive to the colour. In this paper, we suggest a method that allows high-resolution mapping of the artificial light at night by using ground-based measurements with the LANcube system. The newly developed device separates the light detected in four bands (Red, Green, Blue and Clear) and provides this information for six faces of a cube. We found relationships between the LANcube’s colour ratios and (1) the Melatonin Suppression Index, (2) the StarLight Index and (3) the Induced Photosynthesis Index. We show how such relationships combined with data acquisition from a LANcube positioned on the top of a car can be used to produce spectral indices maps of a whole city in a few hours.

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Mapping the Melatonin Suppression, Star Light and Induced Photosynthesis Indices with the LANcube

Cited by 7 publications

References 16 publications

Modeling the Spectral Properties of Obtrusive Light Incident on a Window: Application to Montréal, Canada

Modeling the Spectral Properties of Obtrusive Light Incident on a Window: Application to Montréal, Canada

Estimating lighting device inventories with the LANcube v2 multiangular radiometer

Mapping the Melatonin Suppression, Star Light and Induced Photosynthesis Indices with the LANcube

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