MarkLogic 9 Product Documentation

Geospatial Element Pair Index Configuration Help

A Geospatial Element Pair Index accelerates geospatial queries.

Each Geospatial Element Pair Index keeps track of the points appearing in all pairs of elements with the given names and parent.

Geospatial Element Pair Indexes also allow you to use the cts:element-pair-geospatial-query constructor in searches.

Configure the following for each Geospatial Element Pair Index:

• The parent namespace uri specifies the namespace URI of the parent element.
• The parent localname specifies the local name of the parent element.
• The latitude namespace uri specifies the namespace URI of the latitude child.
• The latitude localname specifies the local name of the latitude child.
• The longitude namespace uri specifies the namespace URI of the longitude child.
• The longitude localname specifies the local name of the longitude child.
• coordinate system specifies the name of the coordinate sytem used for the geospatial data. The default of wgs84 is useful for most commercial geospatial data. Use raw when you want your points mapped onto a flat plane instead of onto the geometry of the earth.
• range value positions specifies whether index data should be included that speeds up the performance of proximity queries involving range queries. Turn this index off if you are not interested in proximity queries and if you want to conserve disk space and decrease loading time.
• invalid values specifies whether server should allow insertion of documents that contain elements on which range index is configured and their contents cannot be coerced to the index data type. It can be configured to either ignore or reject. By default server rejects insertion of such documents. However, if a user configures invalid values to ignore, these documents can be inserted. In that case, the contents of invalid elements will not be indexed. So range queries and lexicon functions that mainly operate off of range index, will ignore existence of such documents in the database.

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Buttons and Tabs:

• Use the Configure tab to edit existing geospatial element pair index configurations. Click the delete button corresponding to a geospatial element pair index to remove it.
• Use the Add tab to add new geospatial element pair indexes to the database configuration.