Availability of spatial data in digital forms integrated to a database refers to as Geographic Information System (GIS) that provides widespread of interdisciplinary applications. GIS can be recognized as an organized collection of computer hardware, software, geographic data, and personnel designed to efficiently capture, store, update, manipulate, analyze, and display many forms of geographically referenced information. With the advancement of computer technologies and telecommunication it allows for the emerging of GIS to be considered as a distributed resource warehouses against the single user or networked within a local area. The originally centralized mainframe GIS systems has been evolved along with the technology development to a personal desktop of GIS, and to currently Distributed GIS services, which include the applications of wired Internet GIS and wireless mobile GIS. The latest advances in GIS have come most notably in the forum of the Internet. Access to spatial data over the Internet is growing rapidly. Web-based GIS could provide interactive mapping and spatial analysis capabilities reducing the problem of data ownership as data providers could open their sources for online mapping and analysis.
The overall goal of this work is to demonstrate the potential of Internet for overcoming spatial data access problems and for facilitating information sharing by large number of users distributed all over the world. In presenting capabilities of Internet GIS, this work was carried out to develop spatial database for Cambodia, one of the most important countries in the Mekong Sub Region where data sharing plays a very crucial part. There is tremendous work being carried out in the region by various national and international agencies creating various information pertaining to land and water where most of them need to be addressed on spatial domain. Further investment on these data generation need to be minimized by sharing information and avoiding duplications. In this aspect, sharing possibility via Internet and analysis over Internet is going to be very productive and advantageous for the sub region as well as others involved in development projects in the region.
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