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A Handy Introduction to Cloud Optimized GeoTIFFs

Since I started working at Planet, I kept hearing about Cloud Optimized GeoTIFFs (COGs). My colleague Chris Holmes even wrote a post explaining what they are and how they’re useful. I decided to implement a Go library to be able to work with COGs. Much of Planet’s satellite imagery is in the GeoTIFF format, including this nice image of Los Angeles from our February 2018 Global Basemap:
An image of Los Angeles from Planet’s February 2018 Basemap. ©2018 Planet Labs Inc, CC BY-SA 4.0.
As a first step to writing a library, I needed to learn about 1) Cloud Optimized GeoTIFFs, 2) GeoTIFFs in general, and 3) even more general than that: TIFFs. I’ve always found binary file formats intimidating they just look like gibberish when you dump them into the console! But there’s logic in that gibberish. Here’s what you can gain from my exploration of this 30-year-old file format. ....

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Light Every Night – New nighttime light data set and tools for development

Light Every Night – New nighttime light data set and tools for development
Illustration of a satellite view of Planet Earth. ©Rakchai Duangdee/Shutterstock
The power was out again. Sitting in a darkened room in western Senegal, the man talked happily about how the arrival of electricity a decade ago had transformed life in the village of Gaouane. But becoming accustomed to reliable electricity had an unexpected downside: “Now when the power goes out, it feels even darker than before we had electricity!”
The World Bank and its partners have been at the forefront of this charge. Supported by an early World Bank Innovations Fund grant, Kwawu Gaba and Brian Min compared ground-based data from hundreds of West African villages, including in Gaouane, against nighttime satellite imagery. This was the first study to directly detect rural electrification at the village level using satellite imagery. ....

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