Splunk 6.3 introduced Choropleth Maps as a new visualization type, and Geospatial Lookups as a new lookup type.
You can create your own geospatial lookup (e.g. based on custom sales regions or zip codes) by uploading a KMZ that contains the specific boundaries.
You can find more information on Choropleth Maps and Geospatial Indexes in the Splunk Docs for 6.3.
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