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====== Enabling a map view ======

In greenstone 3, if your documents or images have GPS metadata then you can add in a Google maps feature which will plot the documents on the map.

Please see the [[http://files.greenstone.org/tutorial/gs3-current/en/images_gps.htm|Image Collection with GPS metadata]] tutorial for details.

There are a few configuration settings missing from the tutorial (as at July 2017). Here is a summary of steps to follow:

  * Add GPS metadata manually to documents, or use EmbeddedMetadataPlugin to extract it automatically from images.
  * Add indexes on ex.Latitude, ex.Longitude, ex.LatShort, and ex.LngShort
  * Add <code><gsf:option name="mapEnabled" value="true" /></code> to the format statements for **search**, **browse** and **display**.
  * Add **raw** to the list for the searchTypes format feature.
  * Rebuild the collection.

Older versions of Greenstone 3 may have an out-of-date code for accessing the google maps api. Check the file web/interfaces/default/transform/layouts/header.xsl, and look for <code><script src="http://maps.googleapis.com/maps/api/js?</code>

If it looks like
<code>
<script src="http://maps.googleapis.com/maps/api/js?sensor=false" type="text/javascript"><xsl:text> </xsl:text></script>
</code>

then change it to 
<code>
<script src="http://maps.googleapis.com/maps/api/js?key=AIzaSyCofVTps3xHfMvIcTMHqYMMxe3xXfkAxnI" type="text/javascript"><xsl:text> </xsl:text></script></code>

Note this uses a key owned by the Greenstone project. There is a limit to how many requests any one key can have per day, so it may pay to set up your own key, see [[https://developers.google.com/maps/documentation/javascript/get-api-key]].