javascript - GeoJSON, Overlapping Pointers, OverlappingMarkerSpiderfier

Question

I'm fairly new to the Google Maps Api. In GeoJson file I have list of geo locations (cordinates lat-lon).

with:

map.data.loadGeoJson('json/geojson.json');

I'm putting data on map as Point-s. I have problem with Points that have same cordinates.

I found this https://github.com/jawj/OverlappingMarkerSpiderfier

but this works with markers so i cant get it to work.

Suggestions? Can I do it with OverlappingMarkerSpiderfier?

My code:

function initialize() {

    var map = new google.maps.Map(document.getElementById('map-canvas'), {
        zoom: 13,
        center: {lat: 45.8167, lng: 15.9833}
    });

    map.data.loadGeoJson('json/geojson.json');

    //////////////////////////
    //CODE FOR GROUPING POINTERS/MARKERS
    //////////////////////////

    map.data.setStyle(function (feature) {
        return {
            icon: '/inc/mapper/img/' + feature.getProperty('icon_url') + '.png',
        };
    });

}
google.maps.event.addDomListener(window, 'load', initialize);

Answer 1

Process the GeoJson, create your own markers, add them to the OverlappingMarkerSpiderfier.

Examples below use MarkerClustererPlus and OverlappingMarkerSpiderfier, data from GeoJSON local to the page.

working jsfiddle (duplicate marker position at Bielefeld in the center)

Working code snippet:

var map = null;
var bounds = new google.maps.LatLngBounds();

var boxText = document.createElement("div");
boxText.style.cssText = "border: 1px solid black; margin-top: 8px; background: yellow; padding: 5px;";
var infobox = new InfoBox({
  content: boxText,
  disableAutoPan: false,
  maxWidth: 0,
  pixelOffset: new google.maps.Size(-140, 0),
  zIndex: null,
  boxStyle: {
    background: "url('tipbox.gif') no-repeat",
    opacity: 0.75,
    width: "280px"
  },
  closeBoxMargin: "10px 2px 2px 2px",
  closeBoxURL: "http://www.google.com/intl/en_us/mapfiles/close.gif",
  infoBoxClearance: new google.maps.Size(1, 1),
  isHidden: false,
  pane: "floatPane",
  enableEventPropagation: false
});

var markerClusterer = new MarkerClusterer(null, null, {
  imagePath: "https://cdn.rawgit.com/googlemaps/v3-utility-library/master/markerclustererplus/images/m"
});
minClusterZoom = 14;
markerClusterer.setMaxZoom(minClusterZoom);

function initialize() {
  var mapOptions = {
    center: new google.maps.LatLng(52, 8),
    zoom: 4
  };
  map = new google.maps.Map(document.getElementById('map'), mapOptions);

  var oms = new OverlappingMarkerSpiderfier(map, {
    markersWontMove: true,
    markersWontHide: true,
    keepSpiderfied: true
  });

  markerClusterer.setMap(map);
  google.maps.event.addListener(map.data, 'addfeature', function(e) {
    if (e.feature.getGeometry().getType() === 'Point') {
      var marker = new google.maps.Marker({
        position: e.feature.getGeometry().get(),
        title: e.feature.getProperty('name'),
        map: map
      });
      google.maps.event.addListener(marker, 'click', function(marker, e) {
        return function() {

          var myHTML = e.feature.getProperty('name');
          boxText.innerHTML = "<div style='text-align: center;'><b>" + myHTML + "</b></div>";
          infobox.setPosition(e.feature.getGeometry().get());
          infobox.setOptions({
            pixelOffset: new google.maps.Size(0, 0)
          });
          infobox.open(map);
        };
      }(marker, e));
      markerClusterer.addMarker(marker);
      oms.addMarker(marker);

      bounds.extend(e.feature.getGeometry().get());
      map.fitBounds(bounds);
      map.setCenter(e.feature.getGeometry().get());
    }
  });
  layer = map.data.addGeoJson(geoJson);
  map.data.setMap(null);
  google.maps.event.addListener(map, "click", function() {
    infobox.close();
  });
}
google.maps.event.addDomListener(window, 'load', initialize);

var geoJson = {
  "type": "FeatureCollection",
  "features": [{
    "type": "Feature",
    "properties": {
      "name": "Bielefeld"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.528849, 52.030656]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Bielefeld2"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.528849, 52.030656]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Herford"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.676780, 52.118003]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Guetersloh"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.383353, 51.902917]
    }
  }, {
    "type": "Feature",
    "properties": {
      "name": "Guetersloh2"
    },
    "geometry": {
      "type": "Point",
      "coordinates": [8.38, 51.9]
    }
  }]
};

#map {
  width: 500px;
  height: 500px;
}

<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<script src="https://cdn.jsdelivr.net/gh/geocodezip/v3-utility-library@master/archive/infobox/src/infobox.js"></script>
<script src="https://unpkg.com/@google/markerclustererplus@4.0.1/dist/markerclustererplus.min.js"></script>
<script src="https://jawj.github.io/OverlappingMarkerSpiderfier/bin/oms.min.js"></script>
<div id="map"></div>