Counting Crowds of People

Stephen Doig, a census expert at Arizona State University, said that the most accurate way to estimate the number of people in a big crowd is getting a good image of the air, breaking it into a kind of density areas, square tape measure in each region, applying the fair value for density in each region, and adds the number of people in each region in order to obtain the total estimate. But the better way count the number of people who buy tickets or entering through the entrance but this is unfortunately rare.

With experience and technique of its computation of the Doig had asked for assistance by the company AirPhotosLive.com to calculate the number of people present at the Inauguration Ceremony of President Obama in 2009 and Glenn Beck's Rally event in Washington, DC recently).

According to Curt Westergard, President AirPhotosLive.com, to get the number of people present at each event, the company AirPhotosLive.com using the camera 360 degrees, the ball that can capture panoramic images of the crowds from every direction and over time "peak" of an event, or at when the number of spectators at most.

From some of the shooting, an analyst estimate crowd size image. A series of 3-D grid can be super-imposed on some images, divisive, drawing large crowds and the complex becomes easier to manage the system.

Examples include parts of the grid size of 100 × 100 × 500 feet or 500 square meters which was measured by counting every person who was in it. Some headcount harmonized into a mathematical formula (known as the spatial distribution of the crowd) that calculates the number of people in every part of the network size based on population density in each section.

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