GeoJSON

  • This page demonstrates how to render geographic data in GeoJSON format on Google Maps using the GMUGeoJSONParser and GMUGeometryRenderer.

  • GeoJSON is a commonly used format for displaying geographic data like points, lines, and polygons.

  • You'll need to set up the Maps SDK for iOS Utility Library before using GMUGeoJSONParser.

  • The provided code examples show how to render GeoJSON data on a map in both Swift and Objective-C.
Select platform: Android iOS JavaScript

This page shows you how to render geographic data in the GeoJSON format, using GMUGeoJSONParser, in conjunction with GMUGeometryRenderer. GeoJSON is a popular format for rendering geographic data such as points, lines, and polygons.

Prerequisites and notes

GMUGeoJSONParser is part of the Maps SDK for iOS Utility Library. If you haven't yet set up the library, follow the setup guide before reading the rest of this page.

For the full code sample, see the sample apps on GitHub.

Rendering GeoJSON data

To render GeoJSON data on a map, create a GMUGeoJSONParser with the path to a GeoJSON resource (GeoJSON_sample.kml in this example). Then, create a GMUGeometryRenderer, passing the GMUKMLParser instance. Finally, call GMUGeometryRenderer.render(). The following code example shows rendering GeoJSON data on a map:

Swift

import GoogleMapsUtils class GeoJSON {  private var mapView: GMSMapView!  func renderGeoJSON() {  guard let path = Bundle.main.path(forResource: "GeoJSON_sample", ofType: "json") else {  return  }  let url = URL(fileURLWithPath: path)  let geoJsonParser = GMUGeoJSONParser(url: url)  geoJsonParser.parse()  let renderer = GMUGeometryRenderer(map: mapView, geometries: geoJsonParser.features)  renderer.render()  } }

Objective-C

@import GoogleMapsUtils; @implementation GeoJSON {  GMSMapView *_mapView; } - (void)renderGeoJSON {  NSString *path = [[NSBundle mainBundle] pathForResource:@"GeoJSON_sample" ofType:@"json"];  NSURL *url = [NSURL fileURLWithPath:path];  GMUGeoJSONParser *parser = [[GMUGeoJSONParser alloc] initWithURL:url];  [parser parse];  GMUGeometryRenderer *renderer = [[GMUGeometryRenderer alloc] initWithMap:_mapView  geometries:parser.features];  [renderer render]; } @end