for the icons used in the embedded map image above.
© Mark Pearson 2012
This page presents statistics and a map.
See information on how and why they were
computed.
| Percentile | Distance (mi.) |
|---|---|
| 10th percentile | 5.37 |
| 25th percentile | 9.44 |
| 50th percentile (median) | 17.70 |
| 75th percentile | 25.08 |
| 90th percentile | 34.40 |
| Max | 52.71 |
This map displays the major airports in and around Massachusetts. It shows how the state can divided according to which airport is the closest as the crow flies.
The flags are a sample of 500 census tracts (of 1,467 tracts total) within the state.
On the above map, some census tract flags may look like they are colored for one airport's region but are actually in another airport's region. The census tract flags are colored with which airport they are closest to as the crow flies along the surface of the earth (the Haversine distance formula). The region boundaries that are displayed on map were computed assuming assuming the earth is flat. (The lines that divide regions are a Voronoi diagram, and I couldn't find any algorithm that calculate the lines on a sphere such as the earth.) In short, although a few census tracts may look like they're mislabeled near a boundary, it's actually the boundary that is slightly wrong.
| Airport | Code | Number of People for whom this is their closest airport |
|---|---|---|
| Gen. Edward Lawrence Logan International Airport | BOS | 3,717,546 |
| Theodore Francis Green State Airport | PVD | 884,650 |
| Bradley International Airport | BDL | 796,347 |
| Manchester-Boston Regional Airport | MHT | 698,898 |
| Barnstable Municipal Airport (Boardman/Polando Field) | HYA | 338,406 |
| Albany International Airport | ALB | 101,610 |
| Nantucket Memorial Airport | ACK | 10,172 |
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Thanks for the Maps Icons Collection
http://mapicons.nicolasmollet.com
for the icons used in the embedded map image above.
© Mark Pearson 2012