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R code to "average" GPS traces from OpenStreetMap to derive usable GPX tracks for roadways
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README.md Use rgeos to do most of the geometry heavy lifting, rather than trying
makeroads.R
process.R Various improvements to fit code, more comments

README.md

osm-makeroads

R code to "average" GPS traces from OpenStreetMap to derive usable GPX tracks for roadways.

Dependencies:

  • R (core)
  • R packages: princurve, rgdal, maptools, geosphere, rgeos (all on CRAN)
  • gpsbabel
  • Also: libgdal and gfortran are required by some of the dependencies above.

To get started using Debian unstable (or presumably Ubuntu w/universe):

apt-get install libgeos-dev r-cran-maptools gpsbabel libgdal-dev gfortran libgdal-dev

R -e "install.packages('princurve', 'geosphere', 'rgeos', 'rgdal', dependencies=TRUE)"

makeroads.R and process.R are lightly commented. Place them in the same directory (and cd there), edit process.R to your liking, then use:

R -f process.R

You'll get a bunch of GPX files named 'roadway-*.gpx', one per identified track, along with Rplots.pdf containing a visual representation of each estimated track along with the tracks that were used to construct it.

Recent Changes

  • This version uses rgeos to ridiculously improve the time taken to match the tracks. (Data matching now takes an order of minutes versus hours in previous versions.)

To-Do

  • Use local principal curves (R LPCM package).
  • Take advantage of parallelism (investigate R multicore?).
  • Memory usage improvements.

Thanks

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