1. I want to use OSM to extract a set of facilities e.g. school, park, hospital inside a given region.

  2. from that, transform the area in grid and for each cell in a grid compute its score mixing the distances of the closest point for each type of facilities (distance from the closest school+ distance from the closest park + distance from the closest hospital)

score area 1= distance from the closest school (= 1.2 miles) + distance from the closest hospital = (2.2 miles)+ distance from the closest park= (0.2 miles) (each distance for each type of facility will be normalized actually)

and 3. represents it on a map (via a HeatMap)

I am sure this is a common practice to determinate for instance the best location to build a facility according to other existing facilities?

Can someone indicate the common process, lib and algorithms for doing such thing?


I'm assuming that you are interested in distances through the road network?

(If you are happy with straight-line distances then I think that it is just a case of learning a GIS package. Grids, within queries, distances, thematic mapping - all standard. I believe that MapInfo is the easiest to pick up)

Using Arc's Network Analyst you can certainly do this. For example, see:


If you learn towards an open source solution, there are several options. I took my initial inspiration from this accessible blog:


With both of these, allow time for a steep learning curve.

PS for the UK some accessibility indices have already been calculated by the government. http://www.dft.gov.uk/statistics/releases/accessibility-statistics-2011/

Also locations of schools, hosptials, GPs etc can be found on the "Neighbourhood Statistics" website.

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