# Map Match

## Match GPS coordinates to the road network

`MapMatchResult mapMatch().match(MapMatchMatchParamsparams, RequestOptionsrequestOptions = RequestOptions.none())`

**post** `/api/v1/map-match`

Match GPS coordinates to the road network

### Parameters

- `MapMatchMatchParams params`

  - `MapMatchRequest mapMatchRequest`

    GPS trace to snap to the road network. Provide an array of coordinate objects representing the GPS points. Maximum 50 points per request.

### Returns

- `class MapMatchResult:`

  Map matching result as a GeoJSON FeatureCollection. Each Feature is a snapped tracepoint. The top-level `matchings` array contains the matched sub-routes connecting consecutive tracepoints.

  - `List<Feature> features`

    Snapped tracepoint Features in input order

    - `GeoJsonGeometry geometry`

      GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

      - `Coordinates coordinates`

        Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

        - `List<double>`

        - `List<List<double>>`

        - `List<List<List<double>>>`

        - `List<List<List<List<double>>>>`

      - `Type type`

        Geometry type

        - `POINT("Point")`

        - `LINE_STRING("LineString")`

        - `POLYGON("Polygon")`

        - `MULTI_POINT("MultiPoint")`

        - `MULTI_LINE_STRING("MultiLineString")`

        - `MULTI_POLYGON("MultiPolygon")`

    - `Properties properties`

      - `Optional<Double> distanceM`

        Distance from the original GPS point to the snapped point in meters

      - `Optional<Long> edgeId`

        Road edge ID the point was snapped to

      - `Optional<Long> matchingsIndex`

        Index into the `matchings` array indicating which matching sub-route this point belongs to

      - `Optional<String> name`

        Road name at the snapped point

      - `Optional<List<Double>> original`

        Original GPS coordinate as [lng, lat]

      - `Optional<Long> waypointIndex`

        Index of this tracepoint in the original `coordinates` array

    - `Type type`

      - `FEATURE("Feature")`

  - `List<Matching> matchings`

    Matched sub-routes. Each matching connects a contiguous sequence of tracepoints that could be matched to roads.

  - `Type type`

    - `FEATURE_COLLECTION("FeatureCollection")`

### Example

```java
package com.plazafyi.example;

import com.plazafyi.client.PlazaClient;
import com.plazafyi.client.okhttp.PlazaOkHttpClient;
import com.plazafyi.models.mapmatch.MapMatchMatchParams;
import com.plazafyi.models.mapmatch.MapMatchRequest;
import com.plazafyi.models.mapmatch.MapMatchResult;
import java.util.List;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        PlazaClient client = PlazaOkHttpClient.fromEnv();

        MapMatchRequest params = MapMatchRequest.builder()
            .coordinates(List.of(
              MapMatchRequest.Coordinate.builder()
                  .lat(48.8566)
                  .lng(2.3522)
                  .build(),
              MapMatchRequest.Coordinate.builder()
                  .lat(48.857)
                  .lng(2.353)
                  .build(),
              MapMatchRequest.Coordinate.builder()
                  .lat(48.8575)
                  .lng(2.354)
                  .build()
            ))
            .build();
        MapMatchResult mapMatchResult = client.mapMatch().match(params);
    }
}
```

#### Response

```json
{
  "features": [
    {
      "geometry": {
        "coordinates": [
          2.3522,
          48.8566
        ],
        "type": "Point"
      },
      "properties": {
        "distance_m": 0,
        "edge_id": 0,
        "matchings_index": 0,
        "name": "name",
        "original": [
          0,
          0
        ],
        "waypoint_index": 0
      },
      "type": "Feature"
    }
  ],
  "matchings": [
    {
      "foo": "bar"
    }
  ],
  "type": "FeatureCollection"
}
```

## Domain Types

### Map Match Request

- `class MapMatchRequest:`

  GPS trace to snap to the road network. Provide an array of coordinate objects representing the GPS points. Maximum 50 points per request.

  - `List<Coordinate> coordinates`

    GPS coordinates to match, in order of travel (max 50 points)

    - `double lat`

      Latitude in decimal degrees (-90 to 90)

    - `double lng`

      Longitude in decimal degrees (-180 to 180)

  - `Optional<List<Double>> radiuses`

    Search radius per coordinate in meters. Must have the same length as `coordinates` or be omitted entirely. Default: 50m per point.

### Map Match Result

- `class MapMatchResult:`

  Map matching result as a GeoJSON FeatureCollection. Each Feature is a snapped tracepoint. The top-level `matchings` array contains the matched sub-routes connecting consecutive tracepoints.

  - `List<Feature> features`

    Snapped tracepoint Features in input order

    - `GeoJsonGeometry geometry`

      GeoJSON Geometry object per RFC 7946. Coordinates use [longitude, latitude] order. 3D coordinates [lng, lat, elevation] are used for elevation endpoints.

      - `Coordinates coordinates`

        Coordinates array. Nesting depth varies by geometry type: Point = [lng, lat], LineString = [[lng, lat], ...], Polygon = [[[lng, lat], ...], ...], etc.

        - `List<double>`

        - `List<List<double>>`

        - `List<List<List<double>>>`

        - `List<List<List<List<double>>>>`

      - `Type type`

        Geometry type

        - `POINT("Point")`

        - `LINE_STRING("LineString")`

        - `POLYGON("Polygon")`

        - `MULTI_POINT("MultiPoint")`

        - `MULTI_LINE_STRING("MultiLineString")`

        - `MULTI_POLYGON("MultiPolygon")`

    - `Properties properties`

      - `Optional<Double> distanceM`

        Distance from the original GPS point to the snapped point in meters

      - `Optional<Long> edgeId`

        Road edge ID the point was snapped to

      - `Optional<Long> matchingsIndex`

        Index into the `matchings` array indicating which matching sub-route this point belongs to

      - `Optional<String> name`

        Road name at the snapped point

      - `Optional<List<Double>> original`

        Original GPS coordinate as [lng, lat]

      - `Optional<Long> waypointIndex`

        Index of this tracepoint in the original `coordinates` array

    - `Type type`

      - `FEATURE("Feature")`

  - `List<Matching> matchings`

    Matched sub-routes. Each matching connects a contiguous sequence of tracepoints that could be matched to roads.

  - `Type type`

    - `FEATURE_COLLECTION("FeatureCollection")`