The Geocode software was fed the exact address of every
call by shift and by day. Then, the density of calls was
calculated by using the Spatial Analyst extension of the
Geocode software, and density maps were generated per
district, per day, and per shift. A map showing various
shades for differing densities was generated. In the most
dense call areas, we initially positioned dispatch points for
ambulances so that travel to any point within the time line
(polygon) will not exceed 8 minutes, taking into account
road signs, one-way streets, and so on.