{
 "what": "The geometry behind the Dealey Plaza reconstruction used in The JFK Files: Where They Lead.",
 "why": "Chapter 5 says the measurements in this book can be checked. That is only true if the numbers are published, so here they are. If the geometry is wrong, this file is where to prove it.",
 "survey": "Positions of the limousine are derived from Commission Exhibit 884, the 1964 survey and re-enactment the Warren Commission ordered, printed at Warren Commission Hearings volume XVII. The plaza itself is built from that survey plus present day ground truth.",
 "units": "Meters, in a local plane with the origin at the plaza. Not a geodetic datum.",
 "counts": {
  "buildings": 173,
  "roads": 1073,
  "footways": 501,
  "rails": 66,
  "grass": 10,
  "water": 5,
  "fences": 1,
  "walls": 1,
  "trees": 10,
  "pois": 3
 },
 "caveat": "A reconstruction is good at showing what could not have happened. It is not evidence on its own, and where it disagrees with the official account the book says so and shows the working.",
 "license": "Free to use, check, republish and argue with. Attribution appreciated: Keith Adler, The JFK Files: Where They Lead, wheretheylead.com",
 "contact": "contact@wheretheylead.com"
}