The central sever is in charge of collecting, processing pictures from community terminals.
The serve software records related data of a gas account.
It acquires pictures of each gas account every month to recognize and record the gas meter.
The serve software can also send instructions flexibly to each node of each community to get a gas meter picture Whenever necessary.
Clients based on browser or application provide convenient graphic user interface.
The size of one gas meter picture of JPEG format is about 10kB,
which means the total traffic between a community and the central server is comparatively low.
And wired metropolitan-area network access point is common available in residential communities.
So the connection between the community terminal and the central server can be established by wired broadband or wireless communication including GPRS and 3G networks.