Tag Archives: brick kilns and slavery India

Satellites and Algorithms against Slaveholders

Brick kilns, tens of thousands across South Asia are often run on forced labor.  Satellite imagery of such kilns can help tally the kilns, enabling organizations on the ground to target slaveholders at the sites…

Some 40.3 million people are held in bondage today, according to the latest estimates from the International Labor Organization, headquartered in Geneva, Switzerland. But finding them is hard… Boyd who works for the Rights Lab estimates, however, that one-third of all slavery is visible from space, whether in the scars of kilns or illegal mines or the outlines of transient fish-processing camps.

Boyd is now using artificial intelligence to speed up the search. As a pilot project, she and her colleagues at the Rights Lab used crowdsourced visual searchers to identify brick kilns. The oval shape of the large ovens, sometimes 150 meters long, and their chimneys are distinctive, even from space. “You cannot mix them up with something else,” Boyd says.

Since then, Boyd has turned to machine-learning algorithms that recognize the kilns after being trained on the human-tagged examples. Last month, in the journal Remote Sensing, she and her colleagues reported that the algorithms could correctly identify 169 of 178 kilns in Google Earth data on one area of Rajasthan, although it also output nine false positives…

Another company, called Planet, has about 150 small satellites that snap images of the globe’s entire landmass daily. The images are lower-resolution than DigitalGlobe’s, but their frequency opens up opportunities to identify changes over time.With Planet data, Boyd and the Rights Lab plan to investigate fast moving signatures of slavery. From space, you can watch a  harvest in Turkmenistan and, based on how quickly the cotton disappears, you can tell whether machines or hands picked it. In the Sundarbans, an area spanning India and Bangladesh, shrimp farms and fish-processing camps employ slave labor to clear mangrove trees—a process satellites can capture.

Excerpts from Sarah Scoles, Researchers Spy Signs of Slavery from Space, Science, Feb. 21, 2018