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gepaf: Google Encoded Polyline Algorithm Format

Encode and decode the Google Encoded Polyline Algorithm Format

Usage

Encoding

> coords <- data.frame(lat = c(38.5, 40.7, 43.252),
+                      lon = c(-120.2, -120.95, -126.453))
> encpoly <- encodePolyline(coords)
> encpoly
[1] "_p~iF~ps|U_ulLnnqC_mqNvxq`@"

Decoding

> coords <- decodePolyline(enc_polyline = "_p~iF~ps|U_ulLnnqC_mqNvxq`@")
> coords
     lat      lon
1 38.500 -120.200
2 40.700 -120.950
3 43.252 -126.453

Notes :

• Performances can probably be tuned up
• Just a single file from which copy/paste the code

References :

Mostly a translation of http://github.com/mthh/polyline_ggl/ (itself a modest translation (i.g no GeoJSON wrapper, etc.) of other well known available implementations such as Node.js Mapbox one)

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.