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A comment on Using Open Street Maps and Kalman Filters to Clean Up GPS Data. Parent comment

Re:Using Open Street Maps and Kalman Filters to Clean Up GPS... by maxerickson on Monday September 12, 2016 @10:56PM (#12485342)
In the US there is also pretty active aerial imaging, between state and local efforts and the National Aerial Imaging Program. The pdf linked at this page seems to have a nice discussion of it:

http://pubs.usgs.gov/fs/2009/3055/

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