HOT, founded in 2010, organizes volunteers to map places with a dearth of geospatial information. They often do their work in response to disasters like floods, earthquakes, hurricanes, and outbreaks, including those that, like Covid-19, qualify as pandemics. HOT’s crowdsourced mapping efforts add to the OpenStreetMap, a free and editable representation of the world. It’s basically a geographical wiki.
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For HOT, the focus—pandemic or not—is always on places where data is sparse, not the cities where you can say: “Siri, show me a 7-11.” And there are a lot of those. “We estimate around 1 billion people live in places that are completely unmapped,” says Rebecca Firth, HOT’s director of community and partnerships.The degree to which your part of the world is laid out in 2-D tends to correlate with your area’s wealth. “Essentially, up until now, mapping has been something that is the preserve of the elite,” says Firth, because it involves lots of training, special equipment, and expensive software. But HOT turns that on its head, gathering data like satellite imagery and creating an interface that lets laypeople transform it. Users do things like can trace roads, tag houses, note businesses, or pin down bus stops. “Anyone anywhere can contribute a few minutes,” says Firth.
In general, HOT relies on donated satellite imagery to create its maps—and so does this Peruvian project in particular. Since the phrase “social distancing” entered our collective lexicon, you’ve probably seen trippy pandemic pictures captured by satellites. They show the highways through Los Angeles looking as empty as a deep-cut midwestern section of I-80. They show tourist attractions cleared of crowds. Parking lots full of unrented cars. Planes sitting packed together, going 0 mph on runways. That stuff is interesting, and can help researchers take stock of our stayings-home, our travel patterns, and the economic effects of the pandemic. But it can also seem a little bit gee-whiz (Wow! Isn’t traffic light?) without a lot of bang.Data from satellites, though, can play a role larger than showing us that we stopped going places: It can help reveal where to deliver help to people—and which spots on the globe might need aid next. When HOT mobilizes its volunteers during a disaster, it sets up mapping projects at the request of a group in need, like a government or an NGO. Disaster responders and those being affected all need to know where to find hospitals, pharmacies, and stores. They also need to see the roads that will let them transport food and medicine to those in need, and to count the houses in the area so they’ll know how many people actually live there. That can help aid workers for example, decide how many vaccines to bring into the field. In Peru, that kind of work, maps combined with demographic data, will help the government get cash—around $107 (US)—to those quarantined near Cusco.
“Buildings and roads aren't visible on the map yet, but you can see them really clearly in satellite imagery,” says Firth. “Volunteers working anywhere in the world turn satellite images into maps by drawing the buildings and roads on top of them using a simple online tool.” While team members sometimes go into the field to collect map data, that’s not always possible or advisable during a disaster—including this one. As the maps take more shape, the team hopes to overlay their information—showing where people live and how to reach them—with demographic data like residents’ age and income.
To start turning satellite snaps into maps through the web portal, all a volunteer needs to do is register and complete training, although some tasks—like validating the maps—require users to have a certain level of experience. As of late afternoon on April 8, 1,462 people had contributed to Covid-19-related mapping, having tagged 200,500 buildings and traced more than 3,000 miles of road.The current Peruvian projects use imagery donated from a company called Maxar. Maxar, based in Colorado, runs the industry’s fanciest picture-taking satellites (if we’re not counting the ones belonging to spy agencies). They help humanitarian efforts like HOT, but they also sell lots of high-resolution snaps to well-heeled businesses and to military and intelligence organizations.
Right now, they are “plugged into the interagency response” in the US, says Rhiannan Price, Maxar’s director of sustainable development practice, and are supporting the co-work of agencies like the Federal Emergency Management Agency, the Department of Homeland Security, and the CDC. Globally, their data and analysis also support the World Health Organization’s ongoing efforts. In the private sector, they’re working with a group called GRID3 to estimate settlement and population in developing countries. “These data layers will help ministries of health and medical workers know where to find villages, figure out how to get there, determine how many supplies to bring with them and start working out transmission patterns for disease,” says Price.Their sensitive satellites—which can spot a sheet of printer paper from orbit—are especially useful in an isolated world. “People simply can’t have access to places,” says Price. With satellites, you can look without going, including at parts of the world where governments might not be open about how they’re handling their response to the pandemic. So far, Maxar has helped reveal to the public things like a giant field hospital that was recently built in Russia, and burial pits in Iran—both countries that have downplayed their outbreaks. “It’s an element of global transparency we need,” says Price.