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Geographic Information Systems (GIS) has a part to cooperate in all geographic and spatial
aspects of the areas like land management, land administration, utility management and
disaster management. Among them, there is growing needs for web based GIS for easy and
fast distribution, displaying and processing of spatial information which in turns helping in
decision making for when natural disasters occurs.
The aim of this study is to design and development of an open source web-based
Geographical Information System allowing users to interact with spatial data within their
web browser. This project is only focus on the spatial data of Kelaniya area which was
affected from flood in 2016. The data on roads, hydro features and buildings were obtained
as secondary data. Geospatial data related to the area is acquired from ground surveys, GPS
surveys, aerial surveys and remote sensing surveys. Data collection depends on the map
which is going to be created. Arc Map l0.land Arc GIS online are the software used to
design the map and publish the generated map. The modifications of the web map can be
done from Java Script to print the launched map and draw polygons, lines on the web map
at the end. GIS branch of Sri Lanka Survey Department is funding in both data providing
and knowledge related to data collection, data processing, creating map and publishing
them.
As the final outcome, buildings, hydro features, roads in that flooded area and flood
boundary which is created using collected data are presented in a web map which can be
accesscd through a web browser at any time by anyone from getting the URL of the map
from the Sri Lanka Survey Dcpartmcnt (SLSD). These spatial data in the flooded area is
mainly used for disaster lnanagement purposes. This web map provides better solution to
the current n ethods r-rsing for distributing maps in SLSD with easy access.
