Why satellites are launched only at sriharikota?

Equatorial satellites are launched from the equator, or as near as the nation has land. French satellites are launched from Devil's Island, a place so hot that it was used for a prison until they wanted to launch satellites. Satellites are launched going east because the planet is already moving a thousand miles per hour. If they launched to the west they would have to provide 2,000 miles per hour more to get orbital velocity.

Polar satellites are launched as near the pole as possible so they don't have to lose that 1,000 mph to get into orbit.