[R-sig-Geo] st_write and gpx file

[Patrick Giraudoux]

Dear listers,

I am making trials with the sf package trying to write point geometries 
into afile. Here is the sf object:

> walk  Simple feature collection with 2095 features and 2 fields Geometry 
type: POINT Dimension: XY Bounding box: xmin: 5.951268 ymin: 47.29238 
xmax: 5.974512 ymax: 47.3015 Geodetic CRS: WGS 84 First 10 features: 
track_seg_point_id ele geometry 1 0 243 POINT (5.95348 47.29709) 2 1 243 
POINT (5.953438 47.29704) 3 2 244 POINT (5.953219 47.29702) 4 3 243 
POINT (5.952884 47.29713) 5 4 243 POINT (5.952492 47.2972) 6 5 243 POINT 
(5.952335 47.29743) 7 6 242 POINT (5.951881 47.29732) 8 7 242 POINT 
(5.951495 47.29724) 9 8 293 POINT (5.951333 47.29719) 10 9 294 POINT 
(5.951388 47.29706)

Writing a shapefile as well as a kml is no problem:

st_write(walk,"walk.shp")

st_write(walk,"walk.kml")

But I cannot go through writing a gpx file, e.g.

> st_write(walk,dsn="walk.gpx",layer="track_points")  Error: Could not guess driver for walk.gpx

I have tried several other combinations all unsuccessful.

Have someone an idea about what goes wrong ?

Best,

Patrick





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