OpenLayers – How to Display Multiple KML Points with Same Coordinates

kmlopenlayers-2

I've got a KML, where several points have the same coordinate, similar to following code:

<?xml version="1.0" encoding="utf-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <name>test.kml</name>
    <visibility>0</visibility>
    <open>1</open>
    <Placemark>
      <name>Place 1</name>
      <Point>
        <coordinates>7.0901548880586,50.723973666434,0</coordinates>
      </Point>
    </Placemark>
    <Placemark>
      <name>Place 2</name>
      <Point>
        <coordinates>7.0901548880586,50.723973666434,0</coordinates>
      </Point>
    </Placemark>
  </Document>
</kml>

If I click on the POI in an OpenLayers-map, only the last point can be selected. Google Maps' solution to the problem are next– and previous-buttons, in Google Earth the placemark "splits" into two (or more) placemarks so you can select one of the placemarks.
Is it possible to create a similar behaviour in OpenLayers?

There is an analog problem if there are two KMLs with placemarks with the same coordinate. I need a solution for this problem, too.

<?xml version="1.0" encoding="utf-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <name>test1.kml</name>
    <visibility>0</visibility>
    <open>1</open>
    <Placemark>
      <name>Place 1</name>
      <Point>
        <coordinates>7.0901548880586,50.723973666434,0</coordinates>
      </Point>
    </Placemark>
  </Document>
</kml>

<?xml version="1.0" encoding="utf-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <name>test2.kml</name>
    <visibility>0</visibility>
    <open>1</open>
    <Placemark>
      <name>Place 2</name>
      <Point>
        <coordinates>7.0901548880586,50.723973666434,0</coordinates>
      </Point>
    </Placemark>
  </Document>
</kml>

Best Answer

Tyr to use Strategy.Cluster: see http://openlayers.org/dev/examples/strategy-cluster.html

Add option: threshold: 2 at Cluster creation, this allows you to view element that does not overlap, and set distance (in pixels) see http://openlayers.org/dev/examples/strategy-cluster-threshold.html

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