DESCRIPTION: I am working on a project to find out how many people are in a given region. Basically I want to make a heatmap showing how people move in a specific day throughout 24h. In order to do so, I was able to get some phone traffic data that shows me people's traffic data (how much time they spend on a given area) and it works perfectly.
PROBLEM: phone traffic data is very expensive.
QUESTION: Are you aware of any technology that would allow me to count/estimate the number of people in a given region without using phone traffic data? Feel free to be creative.