What is a GeoPDF digital map file?

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A PDF is a very common form of digital image data that is in a Portable Document Format.  A GeoPDF file is a geospatial or geo-referenced PDF file that relates the map image (PDF) to a ground system of geographic coordinates (eg. longitude and latitude). Every spot on earth has its own unique longitude and latitude coordinates. The relevant  earth coordinates are typically stored directly in the PDF image file. These GeoPDF files are very useful when used in coordination with navigation applications as they can be used in real time to locate your current location on the map.

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