GPX data is not recorded while GPS signals cannot be received,
such as when traveling underground by subway. The next point is
recorded when GPS reception resumes, so the track may look as if
it has jumped across the map. Warp correction is used to fix these
straight “warp” lines.
Turbo GPX supports the following
warp correction methods.
- Split tracks by distance gap in map display to hide warp lines
- Manual correction using point editing
- GeoJSON correction using overpass-turbo.eu
Splitting Tracks by Distance Gap in Map Display
By setting a gap value in the track parameters for map display,
tracks are not displayed when the distance between points exceeds
the specified value. However, the result may not work as expected
if Color Coding, Overlap, or Multi Segment is enabled. When using
track gap splitting, the following settings are recommended.
| Item | Setting |
|---|---|
| Color Coding | None |
| Overlap | Unchecked |
| Multi Segment | Unchecked |
Manual Correction Using Point Editing
This method inserts points between two existing points to
correct the track.
It is suitable for relatively short gaps,
such as tunnels.
▶GPX Data
Editing Manual Correction
GeoJSON Correction Using overpass-turbo.eu
overpass-turbo.eu is a
web tool that lets you search OpenStreetMap (OSM) data by
conditions and display the results on a map. It also appears to
include a good amount of railway data. The displayed results can
be exported in GeoJSON format. You can then import that file into
the map editing window in Turbo GPX. The imported data can be
handled as regular editing data.