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Facebook bolsters COVID-19 fight with new Disease Prevention Maps

Accurate data is one of the most fundamental tools in any public safety agency’s arsenal against COVID-19. And who better to provide health experts with a wealth of information than a social networking giant with 2.5 billion active users?

Last year, Facebook’s Data for Good team introduced a free data platform called Disease Prevention Maps to improve health outcomes for communities around the world. The company offered nonprofits and humanitarian agencies a rich suite of map products developed using aggregated data to protect people’s privacy. These map products included:

  • High-resolution population density maps with demographic estimates
  • Population movement maps
  • Cellular network coverage maps

Read more: Why Facebook’s disease prevention maps are important

Now, with the coronavirus crisis bringing the world to its knees, Facebook is bringing out three new types of Disease Prevention Maps to help inform disease forecasting efforts and protective measures.

Social Connectedness Index

By displaying friendships and social ties across states and countries, Facebook aims to help epidemiologists forecast the likelihood of the spread of the novel coronavirus. This dataset could also be used to identify which areas might seek support as they are hit by COVID-19. For example, below you can see how connected different parts of the US are to the East Village, New York, on Facebook:

Facebook Disease Prevention Maps

Co-location Maps

These maps reveal the probability of people in one area coming in contact with people from another area, thus helping healthcare agencies and disease modelers to understand where COVID-19 cases may appear next. The image below shows co-location patterns in Italy:

Facebook Disease Prevention Maps

Movement Range Trends

Curated at a regional level, these maps show whether people are staying near home or visiting many parts of town. This information can prove pivotal in providing insights into whether preventive measures are headed in the right direction or not. Below, you can see the movement range trends for Brazil:

Facebook Disease Prevention Maps

As with the map products before, the new Disease Prevention Maps aggregate information from Facebook, ensuring that people’s identities are hidden and reducing the risk of anyone being re-identified.

Explaining how valuable the information Facebook is offering could be in responding to the coronavirus pandemic, Daniel Klein, Ph.D., Institute for Disease Modeling, says, “COVID-19 has inherent delays that challenge the pace at which we seek to evaluate policy impact towards a measured response. Mobility data from Facebook’s Data for Good program provides a near real-time view of important correlates of disease transmission. This data, in combination with other sources, allows us to make better models to inform public health decisions.”

Facebook’s anti-corona measures also include encouraging people in the US to participate in a voluntary survey from Carnegie Mellon University Delphi Research Center, which has been designed to help health researchers identify COVID-19 hotspots earlier. If the results are helpful, Facebook will make similar surveys available in other parts of the world as well.

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Analyzing Mobility Patterns using Geospatial Data

How do my users move in this city? Where do they go? What does the “flow” of this city look like? How does that change throughout the day?

These are the questions that we hear from our users (mostly micro-mobility companies or on-demand companies) quite often. If you are a micro-mobility company (ride-sharing, ride-hailing, carpooling) and these questions inhabit your mind as well, the article should help you navigate through some of those questions.

What is movement analysis?

Until now, we have talked about performing geospatial analytics in primarily two ways:
Static Points: Analysing metrics or events with respect to a static entity that doesn’t move. For example, analyzing how many trips start from a station or what is the average prep time at this restaurant. To read more, check this out!
Aggregations: Using a system of geospatial aggregations such as hexbin or geohash when we are dealing with an event that has happened at a certain place and time. For example, aggregating orders delivered onto hexagonal grids for one city. To read more, check this out.

However, in order to understand the metrics between two events over a trip, movement analysis is very useful. Movement analysis is primarily done on ping data that is either received from vehicle sensors or from driver apps and helps you in understanding how your users and assets move on the ground. 

Characteristics of movement (or trips)

Trips in a city

While analyzing trips, here are the characteristics that we should be looking at:
  • Origin: Where do the trips originate from? For example, in the morning, as users travel to their place of work, trips are likely to start in residential areas or near bus stations or metro stations for the last-mile.
  • Destination: Where do the trips end? Similarly, in the evenings, users mostly travel back to their homes.
  • Paths: What are the most common routes or paths taken by the user? What paths do the most valuable users take? If there are multiple ways to reach a destination, which paths do users take? For example, if you are a carpooling or ride-sharing company, this should also help you analyze what are the most frequented routes for you to pick up the maximum number of users.
  • Distance: What is the average distance of the trips and how does that change with time? Where do long-distance trips originate from? Where do short-distance end to? For example, a lot of trips to the beach are long-distance and are on weekends. Moreover, they originate from the center of the city.
  • Time Taken: What is the average time taken during the trip and how does that change with where the trips originate from? Do short-distance trips also take a lot of time to travel because of the routes they travel through?
  • Repeatability: How much percent of trips are repeat trips? How many users are repeat users?
  • Characteristic: Trips can have several characteristics of their own. For example: How much revenue do you obtain from the trip? Are they profitable? What are the most unsafe routes for users?

    Insights from Analyzing Movement Data

    What are the additional insights that you can get from performing movement analysis?


    Flow analysis (or network analysis) is to understand how the city moves at different times of the day or even historically.

    For example, with one of the last mile delivery companies, studying the flow showed that the delivery partners started moving towards the center of the city and by evening, they started moving out, because most of them lived on the outskirts. But they needed to come inwards because that’s the region in which they receive the maximum amount of orders.

    We usually denote the flow using arcs or lines (and play with time to understand its temporal patterns). Arcs layers help us understand the most frequented origin and destination in the city as well as the distance between them. Arcs don’t show you the paths taken between both the points. The image below shows the historical analysis of the flow in the city of Austin.

    If companies know how people move, they can make their bikes always available in those locations where people originate from. They can also be used to create personas to target them effectively.

    3d arcs

    Another way to show the overall flow can also be done using lines that are just a visual representation of the arcs.

    2d representation of arcs

    Top O-D Pairs

    Just extrapolating from the previous point, when you study the flow, you can also identify what are the top origin-destination points. Knowing the top origin-destination pairs makes reallocation an easy play. You can always keep your vehicles (or drivers) available at those points. This should also help ride-sharing companies to incentivize pick up at those points.

    Idle Spots

    What are the spots where vehicles or riders are idle while in trip? This is a very important analysis to carry out for micro-mobility companies. They are losing out on money for every minute their bikes are not utilized. Most of them charge on a per km ridden basis. Some of the point of analysis for idle spots are:

  • When: Is there a time pattern to when vehicles are idle in trip? For example, in the afternoon near the hotspot tourist location.
  • Characteristic: How many bikes frequent that idle spot together? How many unique trips? How many unique users?
  • Duration: For how long is the vehicle idle for? For example, outside a hospital or for three hours until the movie gets over.
  • Frequency: How often does the vehicle get idle? Is there a temporal or seasonal pattern to it?
  • Distance to Nearest Station: If the bikes are supposed to be in a station, how far is the idle spot to that location?


    Who are the users who do the maximum number of trips? What do your power users have in common? How much time on an average do they spend traveling? How much distance do they travel? Where do they go?
    Having deep knowledge about your power users is a must to understand what kind of persona has the maximum utility of your product and for what use case.


    Outliers help you understand anomalies in your movement data. How many people go to the outskirts of the city? For example, in a lot of cases, we have observed that people cross state borders (which is illegal). In that case, a thorough understanding of just one user or trip becomes fairly insightful.

    Where did this user go? Why? Does he always take these routes? In these cases, having a detailed view of one particular user or trip is important.

    Routes colored by density


    Demand-Supply analysis is key to optimizing asset utilization (and hence reducing the idle time).

  • Next Demand Time: When the trip is ongoing, what does the demand look like at the destination? If the ride is going to end at a location that is actually demand-deficient, your vehicle might end up spending a lot of time idle there or the rider would have to come back without a ride.
  • Point of Interest: Another very interesting analysis that can be done is to analyze how the movement gets influenced by different points of interest such as schools, colleges, malls or tourist destinations.
  • External Events: It would also be insightful to analyze how different external events such as rain, a large concert, a sports match, protests affect the demand and the supply for your company.


Originally posted here.

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