Comments on: Handling Large Amounts of Markers in Google Maps

By: Lasse Rasch

Lasse Rasch — Tue, 03 Jan 2012 17:16:00 +0000

I know this is an old article, but i am commenting anyway I work as a Senior Backend Developer in Denmark, and one of our customers is Trygfonden (Tryg Foundation). They have a website called http://www.hjertestarter.dk. On this site there is a google map containing all defibrillators in Denmark.

We are talking over 5.000 Markers.

When the site was launched some years ago it was done with a standard Google Maps implementation, with Googles Clustering. This was okay as long as the amount of markers was less than 1.500. But Google clustering is client side clustering, so 5.000 markers was way to much for IE and FF to handle, client side….

We created a Server Side clustering algorithm in C# with a JSON Webservice Interface. We devided the visible part of the map into Grid cells (server side) and clustered all markers within each cells with our algorithm.

We are now able to cluster up to 25.000 markers within 1 second and return a clustered set of markers to the browser as a json response.

In my oppinion, this is the only way to solve the clustering problem when you work with many markers

Just wanted to share my thoughts on this subject….

Kind Regards.
Lasse Rasch
Denmark.

By: Vicent González i Castells

Vicent González i Castells — Thu, 01 Dec 2011 16:06:00 +0000

Great contribution. I miss MarkerClustererPlus.

By: Torino Brescia Streaming

Torino Brescia Streaming — Sun, 18 Sep 2011 22:25:07 +0000

Thanks a lot man! This thing really help me out doing Clustering Image Marker.

By: Gabriel Svennerberg

Gabriel Svennerberg — Thu, 04 Aug 2011 11:46:14 +0000

@TestUser: You get that error because ClusterMarker is built for Google Maps API v2 and therefor does not work with v3. Try using MarkerClusterer for v3 instead.

By: TestUser

TestUser — Wed, 03 Aug 2011 15:50:19 +0000

I am trying to use ClusterMarker with Google map API v3.
It gives me error ‘GIcon is not defined.’ Does anyone had this error before.
Really appreciate your help. Thanks.

By: Shad Keene

Shad Keene — Mon, 11 Jul 2011 16:30:39 +0000

Thanks for the thorough article on these marker features!

I’m passing the array of markers and letting marker manager do it’s
thing to display the certain number of markers per zoom level that I designate. However, you’ll note that the initial load shows 100 markers but I tell it to show 60
at zoom level 6, which is the initial zoom level. If you zoom in and
zoom back out, zoom level 6 only shows the appropriate 60. If you
load the page and just zoom out and then in, it still shows 100.
Something must not be working totally right but not sure what.

Lastly, my infowindow is only showing the same infowindow information when I click
on any marker. Shouldn’t the infowindow be unique for each marker
since I’m designating it within the createrMarker function?

Thanks for any help with those two points.

By: carlo

carlo — Mon, 27 Jun 2011 16:16:15 +0000

thank you so much

By: Tspot

Tspot — Sat, 25 Jun 2011 13:00:43 +0000

Thanks a lot! This is what I’ve searched. I play with markers, but I have problem with maps v3 api…

By: Cel

Cel — Mon, 13 Jun 2011 09:00:07 +0000

Thanks a lot man! This thing really help me out doing Clustering Image Marker. BTW, I’m using ClusterMarker. Good Job!

By: chandru

chandru — Mon, 06 Jun 2011 11:32:26 +0000

please help me i’m trying to utilize marker manager but it doesn’t work could you please explain me in details about marker manager i have included the markermanager.js and when i try to get the count its not working it return zero when markers present in my map viewport
mgr = new MarkerManager(map);
after plotting the marker i called
var markercount=mgr.getMarkerCount();