Recently i tried the google maps integration with report/document and here are my inputs and some defintions with the help of MicroStrategy 
Main Features :
- Google Maps can viewed as regular maps
- Threshold can be used
- you can select single or multiple locations in the map and that can be used as filter
Prerequisites :
- Need to get a license from Google (Google Maps API)
- Configure the license with MicroStrategy WEB
- Login to MSTR WEb –> Preferences –> Project Defaults –> General –> under Custom Visualizations –> Enable Custom Visualizations Editor
Configuration:
.Net Environment (Yet to try in J2EE)
To deploy the Map visualization plug-in to your MicroStrategy Web installation and configure it, do the following:
- Navigate to GISConnectors in the MicroStrategy installation directory and open the folder that contains the Map visualization plug-in for your operating environment.
Open the ConnectorForGoogleMap_ASP folder.
- From within the folder you just opened, copy the child ConnectorForGoogleMap folder to the plugins folder inside your MicroStrategy Web installation directory.
- Within the ConnectorForGoogleMap plug-in folder, navigate to WEB-INF/xml/config/google. Open the googleConfig.xml file
- Once you get the license key, paste the key in between <mk> and </mk>
- Add your API key between the <mk> and </mk> tags, in place of InvalidPremierKey shown in bold in the code sample below.– <gc> <mk isPremier=true>InvalidPremierKey</mk>
- Restart your web server.
- Run the report
- Tools Menu –> Custom Visualizations –> Custom Visualizations Editor
- Enable this report to use Custom visualizations
- select AJAX — MAP (move to the right side)
- Enable –> Set view mode to custom visualizations and click ‘Visualizations Properties’
- In the editor;
Select Locations –> Use attribute or form – Use attribute
Select Locations –> Select data type – Latitude/Longtitude
Select Locations –> Select Latitude – Store Latitude
Select Location –> Select Longtitude – Store Longtitude form - Click OK and Click OK on ‘Custom Visualizations’ editor
- Save the report