Abstract
Economics Nighttime lighting is a rough proxy for economic wealth, and nighttime maps of the world show that many developing countries are sparsely illuminated. Jean et al. combined nighttime maps with high-resolution daytime satellite images (see the Perspective by Blumenstock). With a bit of machine-learning wizardry, the combined images can be converted into accurate estimates of household consumption and assets, both of which are hard to measure in poorer countries. Furthermore, the night- and day-time data are publicly available and nonproprietary. Science , this issue p. [790][1]; see also p. [753][2] [1]: /lookup/doi/10.1126/science.aaf7894 [2]: /lookup/doi/10.1126/science.aah5217
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