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Open AccessArticle

Human Lights

1
Technische Universität Braunschweig, 38106 Braunschweig, Germany
2
Ifo Institute and CESifo, 81679 Munich, Germany
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(19), 2194; https://doi.org/10.3390/rs11192194
Received: 25 July 2019 / Revised: 28 August 2019 / Accepted: 17 September 2019 / Published: 20 September 2019
(This article belongs to the Special Issue Advances in Remote Sensing with Nighttime Lights)
Satellite nighttime light data open new opportunities for economic research. The data are objective and suitable for the study of regions at various territorial levels. Given the lack of reliable official data, nightlights are often a proxy for economic activity, particularly in developing countries. However, the commonly used product, Stable Lights, has difficulty separating background noise from economic activity at lower levels of light intensity. The problem is rooted in the aim of separating transient light from stable lights, even though light from economic activity can also be transient. We propose an alternative filtering process that aims to identify lights emitted by human beings. We train a machine learning algorithm to learn light patterns in and outside built-up areas using Global Human Settlements Layer (GHSL) data. Based on predicted probabilities, we include lights in those places with a high likelihood of being man-made. We show that using regional light characteristics in the process increases the accuracy of predictions at the cost of introducing a mechanical spatial correlation. We create two alternative products as proxies of economic activity. Global Human Lights minimizes the bias from using regional information, while Local Human Lights maximizes accuracy. The latter shows that we can improve the detection of human-generated light, especially in Africa. View Full-Text
Keywords: nighttime lights; human light sources; economic activity; human settlements; machine learning; random forest; DMSP-OLS; GHSL nighttime lights; human light sources; economic activity; human settlements; machine learning; random forest; DMSP-OLS; GHSL
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MDPI and ACS Style

Määttä, I.; Lessmann, C. Human Lights. Remote Sens. 2019, 11, 2194.

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  • Externally hosted supplementary file 1
    Doi: dx.doi.org/10.7802/1918
    Description: final data, R-Code
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