14-11-2012, 11:47 AM
Web-GIS applications in Disaster Management - application to the Tsunami
Web-GIS applications.ppt (Size: 5.66 MB / Downloads: 29)
Tsunami - a massive Disaster
Equivalent to impact of several Cyclones
Took away thousands of lives
Destroyed many many houses
Left the survivors on a long road for rehabilitation
Tsunami – What is it?
Tsunami is a Japanese word which means ` harbour wave ’.
They are generated when the ocean floor shifts vertically, usuallydue to an earthquake.
When a shift in the ocean floor displaces the water above,the body of water travels as a huge wave to regain the equilibrium.
In deep water, a tsunami can travel at ~700 km/hr, but it gets slower near the coast and water mass rises up to 50m.
GIS comes into the picture…
We know that any planning and management process requires data as a support to take decision. If the data is on paper or even in computers in tabular format, it can’t be as useful as data represented on maps because this can enable us to create various thematic analyses ad hoc.
Need of Web GIS in Disaster management
Accessibility and dissemination of timely and accurate information
Centralized Control: A web GIS can disseminate information from a control room which can reach everyone. Authenticity and accuracy are guaranteed.
Only one map needs to be maintained at the server.
Changes made in the map are reflected everywhere
No need for a GIS Software with the users
No need for training the users in GIS
Instant Feedback and updation: The current status can be updated from moment to moment