You will be able to retrieve the latitude and longitude data for already targeted
Proximity criteria. You need to include the
GeoPoint in the selector when using the
CampaignCriterionService to get this data. If you're trying to get the latitude and longitude for the locations in the
Geo target list, then it is not possible, as this list specifies locations pertaining to particular geographical region and their criteria Ids. Let me know if you have any other questions.