Google maintain database of all locations of the world.This location database is Geo Location Databse.This geolocation database is used by all the google map applications.

 

Long Lat Data:

Latitude (shown as a horizontal line) is the angular distance, in degrees, minutes, and seconds of a point north or south of the Equator. Lines of latitude are often referred to as parallels.

 

Indian Geographical Database:

Contains the geographic features of India. Dataset Includes the Latitude and Longitude of Each Geographic Feature. This dataset is Perfect for Geocoding Applications. Database also contains all Feature Classification for Administrative regions, Populated places, Vegetation, Locality or area, Undersea, Streets, highways, roads, or railroad, Hypsographic, Hydrographic and Spot feature locations.

 

Reverse Geocode Address Database:

It is reverse of Geocoding.Reverse geocoding is used for vehicle tracking, for location based services and other applications where you have a gps signal with latitude and longitude and want to know information about the address or place this location represents.
With reverse geocoding you can get details like

•  Street
•  Street number
•  Lat/lng of address and distance to address
•  Postal code
•  Place name
•  County
• State

 

Map Address Database of all Cities in India:

This is a list of cities in India whose population is above 20,000.It contains information of

• Name of City/Town
• Name of State
• Classification
• Population