Big Data: history to scale | Duff Johnson Strategy and Communications

The USGS scanned their maps to geospatial PDF for three reasons:

   - the ubiquitous nature of PDF
   - the image-compression possible in PDF. Many of the original scans –
   uncompressed and 1200 dpi – are over 1 GB, impractical for serving on the
   web
   - the geospatial encoding possible in PDF

Although users can download historical USGS maps for free, North Avenue’s
Memento Server takes the experience to another level, stiching together map
edges to form a seamless whole, and providing immediate comparison with
other time-periods.



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Source: http://duff-johnson.com/2014/07/21/big-data-history-to-scale/
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