Geospatial · Geocoding and routing

Map-match

Snaps noisy GPS points onto the road network, one matched path per trip or each point with its confidence.

Also known as: Snap to road, GPS traces

How it works

Pick the Latitude and Longitude columns of the GPS points and the Routing tiles. Trace column (optional) groups the points into separate trips; leave it blank to treat the whole table as one trace. Order column (optional) sorts the points within a trace; blank keeps the input order. Choose a Travel mode (Car by default, or Bike, Walk or Truck) and an Output. Matched path returns one row per trace with trace_id, matched_geometry (the snapped line), matched_distance_m and matched_duration_s. Point confidence returns one row per input point with point_index, snapped_lat, snapped_lon, match_type and distance_from_trace_m, so you can see how far each raw fix moved.

Inputs and outputs

Settings

{
  lat: string
  lon: string
  traceColumn?: string
  orderColumn?: string
  costing: "auto"|"bicycle"|"pedestrian"|"truck"
  output: "matched"|"points"
}

Example

Fleet trackers log a point every 10 seconds. Set Trace column to trip_id, Order column to recorded_at, Travel mode to Truck and Output to Matched path, then Spatial Measure the matched_geometry length per trip. Switch Output to Point confidence to find trackers whose fixes drift far from the road.

More in Geocoding and routing

• Geocode — Finds the latitude and longitude for addresses or place names and adds a point. Works offline at city level, at street level with an address index you build, or through an online service you opt into.
• Reverse Geocode — Finds the nearest place or street address for each point and adds place, region, country, street, city and postcode columns. Works offline at city level, at street level with an address index you build, or through an online service you opt into.
• Route — Works out the road route between each row's start and end point, with distance, travel time and the route line. By car, bicycle, foot or truck.
• Isochrone — Draws the area you can reach from each point within a time or distance, such as a 15-minute drive.
• Matrix — Works out road distance and travel time between every pair of points, or from each start to each destination. For example, drive time from every store to every customer.
• Optimize stops — Puts stops in the visiting order with the least total travel time or distance on the road, for one or several vehicles.