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Sharing and cooperation in geo-information technology
Aziz, T. Lukman

attached to the Internet or a monitoring network via a
cellular line or a VSAT. Clients from anywhere in the
world, provided they have access to the Internet or that
particular monitoring network could establish connection
with the server and the server would then transmit real
time images directly to them. RMS also provides the
capability for multiple clients to access the server at the
same therefore the monitored are could be watched from
several different places.
Figure 1: General overview of the system
The system would mainly consist of 3 modules which
a) Server module
b) Transmission and Communication module
c) Client and interface module
d) Compression and decompression modules
The task under the server module would be dealing with
the interaction of the camera and the computer, prepares a
communication channel to establish connection with the
clients, send images to the clients and monitor the
connection status. At the server’s site, the images would
be compressed while at the clients’ sites, the image would
be decompressed. Compression plays a vital role because
without a proper and effiecient method of compression
we cannot ensure of the delivery of a continuous image in
real time because of the amount of data required to be
transmitted. Currently, the compression method used is
VDO Wavelet Video Codec (VDOM).
The detail design of the above system would be clients
establishing connection using TCP/IP connections. This
is to ensure reliable data for security reasons i.e. login
and password validation. In return the server program
would get the clients IP address and broadcast the packets
(compressed images) using UDP to ensure fast and
continuous transmission of images. At the other end the
client program would be ready to receive the packets,
decompresses them and displays the images. This entire
process would be done in real-time.
The server allocates individual connection to each clients
as shown in the Figure 2 below. This is to monitor their
connection and to ensure that a proper communication
channel always exist between the server and client in case
of termination of either parties.
At the server’s side, pictures of the captured images could
be previewed. At the client’s site a proper interface would
be necessary to enable the user to establish connection to
the server either by selecting the server or keying the
server’s IP address or names.
The user is also allowed to disconnect from a particular
server to establish a connection with another server by the
assumption that multiple servers are running concurrently
at multiple locations. If the server could be executed for
24 hours without any interruption, the clients would be
able to access it anytime for the purpose of monitoring
that particular area.