Original file (Ogg Theora video file, length 1 min 17 s, 1,280 × 720 pixels, 195 kbps, file size: 1.78 MB)
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Summary
| Description |
This is a visualization of US expansion in North America from 1700 to 1900, seen through changes in the spatial distribution of post offices.
Data from the USPS Postmaster Finder, with lat/long coordinates extracted from placenames through correlation with the USGS Geographic Names Information System. Of course, there are a few caveats: the USPS admits that their post office data is a constant work in progress, so there are likely many offices that aren’t shown on this map. About 10% of the placenames in the USPS data failed to find any coordinate matches in the GNIS data, so those don’t show up either. Finally, the USPS data includes closing dates for many offices, but these aren’t represented on the map, which might give a false sense of density in some areas. http://derekwatkins.wordpress.com/2011/08/06/posted/ |
| Date | |
| Source | http://vimeo.com/27376376 |
| Author | Derek Watkins |
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This file was selected as the media of the day for 23 July 2012. It was captioned as follows:
English: This is a visualization of US expansion in North America from 1700 to 1900, seen through changes in the spatial distribution of post offices .
Other languages
English: This is a visualization of US expansion in North America from 1700 to 1900, seen through changes in the spatial distribution of post offices . Македонски: Проширувањето на САД во Северна Америка во периодот од 1700 до 1900 г, изразена преку просторната распределба на поштите. 中文（简体）：通过邮局变化展示了美国从1700年到1900年在北美洲的扩张。
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:16, 16 March 2012 | 1 min 17 s, 1,280 × 720 (1.78 MB) | Atlasowa |
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