Turbo GPX | GPX Point Editing GeoJSON Correction

This section explains warp correction using overpass-turbo.eu.

This example uses GPX data recorded while traveling on Rome Metro Line A in Italy, from Repubblica station to Lucio Sestio station. Points No.7 to No.8 cover the subway section. Because GPS signals could not be received underground, there is a gap of about 7 km.

You can also see the warp on the map.

Turbo GPX | GPX Point Editing GeoJSON Correction

Use overpass-turbo.eu to create data for the target section.

Turbo GPX | GPX Point Editing GeoJSON Correction

[out:json][timeout:60];
area["name"="Roma"]["boundary"="administrative"]->.a;
(
  node(area.a)["railway"="station"]["name"="Repubblica"];
  node(area.a)["railway"="station"]["name"="Lucio Sestio"];
)->.stations;
rel(area.a)["route"="subway"]["ref"="A"]->.r;
way(r.r)->.tracks;
(.stations; .tracks;);
out geom;

Run the query.

Turbo GPX | GPX Point Editing GeoJSON Correction

If the query succeeds, the results are displayed. Export the results in GeoJSON format.

Turbo GPX | GPX Point Editing GeoJSON Correction

Next, import the GeoJSON file in Turbo GPX map editing ([Edit]-[File]-[Import GeoJSON]).

Turbo GPX | GPX Point Editing GeoJSON Correction

On the [Options] tab, set the name field to Label ([Import GeoJSON]-[Set name to]=Label). This stores the GeoJSON name data in the Label field. In this example, Repubblica is set as the first Label and Lucio Sestio as the last Label.

Apply the editing data to the main window. Set [Apply to GPX List] Mode to Insert and Insert No. to 7, then click the [Apply] button.

The points have been inserted below No.7.
Open the map view.

The warp has been corrected.

GPX Data Editing GeoJSON Correction