  The planet Earth has hundreds of impact events, with some occurrences causing
both in terms of human casualty as well as economic losses. Such attitudes of
earth pushed the frontiers to develop innovative monitoring strategies for the
earth system. To make that real, although, will require coherent and real-time
data by observing the earth behavior contiguously. Wireless Sensor Network
(WSN) appears to be the best suitable infrastructure to sense environmental
parameters of our interests. In this event of earth observation, another
important issue is the monitoring system with high level of precision. There
are different types of sensors to measure the behavioral aspects of earth. The
sensors integrated with WSN, provide an accurate and contiguous data for
analysis and interpretation. This paper briefly addresses earth observation and
areas of critical importance to people and society. A case study has also been
carried out for disaster like Landslide in the North Eastern region of India.
Application software has been developed for the said study for online data
acquisition and analysis with pre-disaster early warning system. The system
monitors the changing geotechnical condition of this region using various
geo-technical sensors like Rain gauge, In-place Inclinometer, Tilt-meter,
Piezo-meter and Crack meter. This paper also touches upon the aspects of data
transmission over Global System for Mobile Communication (GSM) / General Packet
Radio Service (GPRS) to a remote data center.
