GeoJSON

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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